yacht boat heaters

Yachting Monthly

• Digital edition

Best diesel heaters for boats – An expert buyer’s guide

• Duncan Kent
• December 15, 2023

The best diesel heaters for boats have seen some great improvements over the past few years. They're the most common form of heating onboard motorboats and sail boats. Duncan Kent talks through the options and what to avoid.

Best diesel heaters for boats – This article was first published 7 July 2021 – it was revised and updated 15 December 2023

I live on my boat all year round, come rain, hale, snow and heat wave. The climate I live in lends itself to having some reliable heating fitted. It can be very tempting to try one of the very low priced copies of the real deal heaters from Webasto or Eberspacher.

A good number of the low-cost, often cloned diesel forced air heaters available online do not conform to UK or EU laws and regulations.

Most budget diesel forced air heaters were originally designed for trucks or motorhomes, which have different requirements and are not subjected to such a vigorous environment as that found in a sea-going yacht.

I bought a second hand Taylors Paraffin heater for one of my boats, after paying for it to be professionally serviced and important bits replaced, it was still slightly less expensive than new, but not by much.

I chose the Taylors heater because it requires no electricity at all.  But it’s a faff compared to pressing an igniter button and having hot air pumped around the place which is what you get with a blown air heater. The downside is that they need some electricity to keep working and they’re noisy, especially for the neighbours who have to put up with the exhaust noise.

There’s a few second hand heaters on the market. Make sure if you do buy something second hand, that you get it professioanlly serviced and also when running any kind of combustible burner inside your boat ensure you have a good quality carbon monoxide detector fitted to your boat.

Buyer beware. We recommend trusted heater manufacturers with certified warranties and customer service backup. Buying a diesel heater intended for use in road vehicles rather than boats, or a diesel heater that does not meet UK safety standards, could pose a risk to life.

If you want heating you can trust then here’s our guide to the best diesel heaters for boats

We’ve divided this guide into two sections, with the best boat heaters for boats up to 38 foot and the best diesel heaters for boats over 40 foot.

The best Diesel heaters for boats up to 38 foot

Eberspacher Espar Airtronic S2 D2 L 12V 2.2kW (7500BTU) with EasyStart PRO 7 Day Timer

One of the most popular manufactures of best diesel heaters for boats , Eberspacher , has recently upgraded its Airtronic heaters, giving them a power boost mode for fast initial heating plus continuously variable temperature settings.

They also now have a fresh air mode to improve air circulation through the boat on warm days.

Years of continual development has made these heaters more economical, quieter and more importantly, reliable.

The wide range of controls on offer includes various panels with switches and LCDs, or there’s the latest, EasyStart Call, which allows you to operate your heater using the proprietary smartphone app.

The app turns your phone screen into a simulated control panel and transmits your selected settings to a GSM module installed in the heater.

Models include the Airtronic D2 and S2 D2L (<32ft LOA), D4+ and M2 D4L (26-39ft), D5 (36-49ft) and the D8LC (49-62ft).

Buy it now from Amazon

Note: We may earn a commission when you buy through links on our site, at no extra cost to you. This doesn’t affect our editorial independence.

Webasto air top 2000 stc 12v marine diesel boat heater kit.

Webasto’s steplessly modulated heating systems are renowned for their high build quality, performance and reliability.

The range features numerous safety devices and procedures, including flame detection and exhaust heat sensing, to ensure safe operation.

The smaller and less sophisticated model is its Airtop 2000STC, a 2kW heater that offers up to two outlets, thermostatic controls, external temperature sensor, air intake silencer and low-noise fuel pump.

The new MultiControl digital timer/temp controller offers instant access to functions plus a quick start button and is sealed against water ingress.

Webasto are known as one of the leading manufacturers of best diesel heaters for boats and appear much the same as Eberspacher heaters… but they are different and have small differences.

For larger yachts there’s the high-output, multi-mode Airtop Evo 3900 (<40ft) or 50 (<50ft).

Both are powerful, yet quiet and economical and can be controlled using a MultiControl, a TeleStart wireless remote pad or via a mobile phone app using its ThermoCall system.

The temperature is regulated using intelligent blower control whereby the heater output and fan controls are separately sensed to reduce power and fuel consumption.

The Evo series has also been upgraded with ECO mode for reduced electrical power consumption, Boost mode for maximum output and Ventilation mode to provide fresh air to the cabins on a hot day.

Buy it now at Amazon

Wallas 22GB Coastal Kit

Wallas recently updated its 2.2kW (22GB) and 3.2kW (30GB) Nautic models by changing their blower motors to brushless types.

The result is more power and output capacity, allowing the boat to heat up quickly, efficiently and quietly.

Its new laminar flow burner offers low emissions of CO2 and NOx, and is designed to work with blended bio-diesel.

Renewable materials are used in its construction, although it retains high-grade aluminium components where necessary.

The new control panel offers smooth PI-controlled thermostat adjustment and two-step air boost protection against accidental operation.

Buy from Kuranda

Like most systems now, Planar heaters can be controlled via your phone

New kid on the block, Russian-built Planar heaters appear to be a genuine compromise between cost and quality, although there seems to be little difference in the latter to the higher-priced brands.

Planar’s UK distributor is currently small, yet it holds a full range of spare parts (unlike many of the cheaper Chinese models) and the reviews on its service have so far been excellent.

Its Autoterm Air marine range comprises a 2kW and 4kW heater; however, larger units can be made specifically to suit.

The standard kit comes with a basic rotary control panel offering stop/start, capacity and air temp control and LED indication of heater status.

The next level has an additional seven-day timer, ventilation mode and an LCD for temperature indication.

Finally, there’s a GSM modem option with smartphone app for remote operation via the mobile phone network.

This offers all the features of the more advanced LCD control panel, only on your smartphone.

Visit www.planarheaters.co.uk

Refleks Stove Heater Refleks 11032-66M heater

The Refleks stoves are popular with more traditional year round cruisers. Seen in working boats, fishing boats and a wide array of sail boats and traditional motor cruisers, the Refleks diesel heaters are king of the cold. They’re sturdy drip fed units that radiate heat rather than blow it around.

The larger Refleks stove heater models have additional internal pipework that allows further radiator heat or hot water heating. This small unit is the most basic and most budget friendly though and considered practically bomb proof.

The advantage of the drip fed heaters is that you don’t get the loud exhaust noise associated with blown air diesel heaters.

Total heat output: 1.6 kW (1400 kcal/h) Fuel consumption: min. 0.12 l/h Fuel consumption: max. 0.30 l/h This one is for area volume sizes of approx. 14 – 23 Cu. Mtrs.

Buy now from Hartlepool Marine Supplies

for more info on Refleks heaters go to the manufacturer site

Blakes Lavac Taylors Diesel Heater Britannia 079D Stainless Steel

Fuelled by red or clear diesel, fed from from its own gravity tank – Header tank version – or pumped direct from the boat’s supply – main fuel tank version.

It is a superbly simple heater for boats. Fitted to a bulkhead the heater radiates heat rather than pumps hot air around ducting. As a gravity fed unit this is virtually silent running.

An excellent choice for anyone wanting to live aboard or use their boat year round. This model suits a smaller boat up to 38 foot.

Made of high-quality materials well bolted together Up to 2.1 kilowatt output Front opening door gives access for maintenance or adjustment Supplied with a 1.5 gallon tank, a safety on/off fuel control valve, in-line fuel filter, pipe work and fittings for installation Externally vented and bulkhead mounted Through-deck fitting flue sections also supplied Available in a brass or a Stainless Steel finish.

Buy it from Marine Store

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A digital timer offers instant access to functions

Webasto Air Top Evo 3900 Marine Heater

ECO mode for reduced electric consumption, power mode PLUS for +10% more heat output (from 3,500 W to 3,900 W) and ventilation mode to supply fresh, cold air to the interior on hot days.

It is supplied with a universal marine kit which includes copper fuel piping and appropriate connections, fittings for installation and rotary controller. Ducting or Outlets are sold separately as an added extra.

Fuel Consumption Control Range: 0,17 – 0,42 l/h -Nominal power consumption control range: 15-36W –

Weight: 5.9kg -L x W x H: 425 x 148 x 148 mm

Buy from Gael Force Marine

Webasto Air Top EVO 40 4kW 12v Marine Heater Kit with MultiControl HD 7-Day Timer

The Webasto Air Top EVO 40 is compact, quiet, and economical heater requiring from 0.18 to 0.43 litres of diesel per hour.

Suitable and trusted for many types of marine installations and certified for installation in passenger areas and in proximity to dangerous substances.

This Webasto Air Top EVO 40 heater comes with a complete installation kit to install into your boat. This components option can also be viewed perhaps as a starter kit, supplied with basic electronic temperature control. This kit does not include ducting or air outlets – please see our range of additional ducting outlets and digital controllers to enable a truly bespoke and cost-effective Marine solution.

Marine 12volt 4.0kw kit Contents: • Webasto Air Top EVO40 self regulating 12 volt air heater with • MultiControl HD 7-Day Timer with On-board diagnostics • All electrical harnesses and connections • 1.8m Stainless steel exhaust silencer supplied with lagging insulation (measured lengths of 24mm stainless steel exhaust pipe are available if required) • Copper Fuel pipe system, complete with fuel metering pump • 1 x Fuel Stand Pipe • All necessary clips and screws for this installation included • Comprehensive installation manual • Stainless steel Heater mount bracket • Stainless steel exhaust hull skin fitting • Webasto Air Top EVO40 24 months warranty

Buy now from Butler Technik

Eberspacher Airtronic M2 D4 L 4KW 12v Diesel 2 Outlet Marine inc Easy Start PRO

One of the best known makes of marine heaters, Eberspacher , has recently upgraded its Airtronic heaters, giving them a power boost mode for fast initial heating plus continuously variable temperature settings.

Buy it now from heater parts direct

Eberspacher Hydronic S3 HS3 Universal 5kW 17000BTU Vehicle Water Heating Kit including Easy Start PRO 12v

Diesel fired water heater with 5 kW heating power, for cabin interior saloon heating and engine pre-heating. The Hydronic can  heat domestic hot water if coupled with a plate heat exchanger, hydroplate or calorifier.

The kit includes

Eberspacher Espar Hydronic S3 D5E CS Water pump and fuel pump Easy Start Pro Controller with 7-day timing and altitude switching Heater wiring harness and electrical accessories Mounting bracket and fixing bolts

Features: Stepless modulated heating from 1.3kW up to 5kW depending on requirement. dimensions: 215 x 91 x 144 mm. Silent running fuel pump The Hydronic S3 Economy has a service life of 3000 hours. That’s just over 8 hours a day for 365 days of the year!

Buy upgrade kit from Butler Tecknik

Buy complete kit from Butler Tecknik

Common issues are incorrectly designed exhausts, corrosive steel clips, screws and brackets, plastic fuel lines and filters, and non-watertight casings.

Some really cheap models lack thermal sensors, overheat alarms and shutdown modes, thereby presenting a very real risk of an onboard fire should the heat outlet accidentally be covered by a carelessly placed sail bag or drooping sleeping bag.

There’s also the possibility of carbon monoxide entering the boat if a fender is left dangling over the exhaust while the heater is running, or if the silencer is of poor quality with crimped, rather than welded seams.

All these are very typical scenarios found on a cruising yacht and highlight the need for the appropriate, built-in safety devices listed in the regulations.

Recent advances in diesel forced air heaters

As with most marine equipment, heating systems have been subject to gradual improvement over the past decade, both in regard to technical features and from a safety point of view.

Many are also now more economical on fuel and efficient on output, and the introduction of brushless fan motors has resulted in them using less electrical power and running much more quietly.

New glow ‘pins’ rather than the older style glow ‘plugs’ have greatly improved fuel burn efficiency too and gone a long way towards eliminating ‘coking up’.

Many recent diesel heater models now have a boost function just to pre-warm the boat and an eco-setting in which it just ticks over enough to retain the temperature within a narrow range.

There has also been a good deal of improvement in the controls.

In the past they’ve been simple electro-mechanical devices with either a rheostat or multi-way switch to select the temperature range.

Then along came more accurate controls with LCD displays and built-in seven-day timers.

Now, there are wireless remotes on offer and you can even control heaters by mobile app or online, so that you can switch the heater on when you’re a few miles away and climb aboard a toasty boat whatever the weather.

How much will a diesel forced air heater cost me?

It’s important to work out what you need for your installation before attempting to compare prices.

Most kits come with enough bits for a single outlet and the minimal amount of ducting. So, if you want two outlets, you’ll need to measure carefully and price it in, along with a grill and a T-piece connector (£60).

Many owners now fit silencers to the fresh air intake as well, to quieten the ‘roar’ heard with older models, plus anti- vibration rubber mounts to lessen the sound of the fuel pump are also available.

Continues below…

The cost can increase if you want a fancy controller, too.

They usually come with just an analogue rotary-type knob with an LED or two to indicate operation status.

While this might suit some, others may want a remote panel with an LCD to show what’s going on (£150- £200), or even control via their phone.

Don’t be fooled by the ‘free’ app though, it’ll only work if the heater is connected to the GSM network, and that involves buying a modem and a SIM card (£200-£300, plus around £7.50/ month for the SIM).

If you get an advanced control box it’s worth fitting a temperature sensor. Finally, check how long the standard control cable is, as an extension can sometimes mean it’s cheaper and easier to opt for a wireless remote (£150).

Marine heater safety

Many of these heaters are designed for vehicles and don’t always list a specific marine kit.

Check the kit contains enough lagging to double-lag the exhaust and make sure the exhaust outlet is stainless or bronze and angled up to allow for a swan-neck in the pipe to eliminate back-feed of water.

It is also worth double checking the kit is marine specific.

Automotive heaters are designed to be fitted externally, so do not require the same standard of air-tightness on the joins around the exhaust and on the welds around the silencer.

Similarly, metal fittings may be galvanised rather than stainless steel, and vulnerable to rust, and fuel lines not of the same specification.

The critical safety issue is that of carbon monoxide.

A properly installed heating system will run without issue, but as we’ve seen too often, an exhaust leak or other fault can be fatal.

All boats should have a CO alarm anyway, but check yours is in date and working.

FIREANGEL FA3820-EUX10 BATTERY STANDALONE CARBON MONOXIDE ALARM

Buy carbon monoxoide detector from Screw Fix

Diesal Heaters for Boats: The Ultimate Guide to Choosing and Installing

Diesel heaters for boats are essential for those looking to extend their sailing seasons into the colder months or simply wanting to maintain a comfortable temperature on board. These heating systems not only serve to keep the interior warm and cozy but also aid in reducing dampness and mold, improving the overall living conditions. With numerous options available, it's crucial to understand the basics and select the most suitable heater for one's specific boat and needs.

In this ultimate guide , we will explore the various types and specifications of diesel heaters, taking into consideration factors such as boat size, heating requirements, layout, and energy efficiency. From compact models like the Eberspacher Espar Airtronic S2 D2 L for boats up to 38 feet  (source)  to more powerful alternatives for larger vessels, there's a heater for every sailor out there.

Apart from discussing the best diesel heaters on the market, this guide will also offer insights into the installation process and share tips on how to maintain and troubleshoot these systems, ensuring a safe and comfortable experience for all boaters. With this knowledge, one will be better equipped to make informed decisions about diesel heaters, gearing up for more enjoyable stays on board in any weather conditions.

Understanding Diesel Heaters for Boats

Components and functioning.

Diesel heaters are designed to provide warmth on a boat, utilizing diesel fuel from the boat's fuel tank. They typically consist of several main components: a combustion chamber, fuel pump, control unit, heat exchanger, air intake, and exhaust pipe. Diesel fuel is mixed with air in the combustion chamber, where it is ignited and generates heat. The heat produced is then transferred to the boat's interior via the heat exchanger.

One key aspect of diesel heaters is their forced air system. This means that a fan pushes air over the heat exchanger, which warms and distributes it throughout the boat. This forced air system allows for efficient and quick heating of the boat's interior, ensuring comfort during cold weather.

Since diesel heaters require fuel, it is important to ensure that the fuel system is functioning properly. This includes having a reliable fuel pump and clean fuel lines. Additionally, the exhaust pipe should be properly insulated and vented to the outside to prevent any dangerous gas buildup within the boat.

Types of Diesel Heaters

There are several major brands of diesel heaters available, such as  Webasto , Eberspacher (also known as Espar), and Chinese diesel heaters. Each of these brands offers a variety of models catering to different boat sizes and requirements.

• Webasto:  A popular choice among boaters, Webasto offers a range of diesel heaters, such as the Air Top EVO 40, which is compact, quiet, and economical. This heater requires 0.18 to 0.43 liters of diesel per hour and is suitable for marine installations in various areas of the boat, including passenger areas and proximity to dangerous substances.
• Eberspacher (Espar):  Eberspacher heaters are well-known for their reliability and performance. They often come with advanced control units, allowing for precise temperature settings and fuel consumption management.
• Chinese Diesel Heaters:  These are more affordable alternatives to the major brands. While they may offer more limited features and may not have the same level of quality control, they can still provide adequate heating for smaller boats or those on a tight budget.

When choosing a diesel heater, it is important to consider the size of your boat and your heating requirements. For example, boats 20 feet or smaller may require a 3-4 kW heater, while those between 21-30 feet may need a 7-9 kW heater. Larger boats (31-42 feet) may require two 9-12 kW heaters, depending on the layout and the number of cabins.

In summary, selecting the appropriate diesel heater for your boat will depend on various factors, such as boat size, heating needs, and brand preference. Regardless of the choice, proper installation and maintenance are crucial to ensure the longevity and efficient functioning of the diesel heater.

Choosing the Right Diesel Heater

Heating capacity.

When selecting a diesel heater for your boat, it's essential to consider the heating capacity needed to maintain a comfortable temperature onboard. The size of your boat and the number of cabins play a significant role in determining the required heating capacity. For boats 20 feet or smaller, a  3-4kw diesel heater  should be sufficient. Boats between 21-30 feet may require a 7-9kw diesel heater, while boats between 31-42 feet could need two 9-12kw diesel heaters.

Fuel Efficiency

Fuel efficiency is a crucial factor in choosing a diesel heater, as it directly impacts the operating costs and overall energy consumption. A fuel-efficient diesel heater should offer high performance and low fuel consumption under various conditions. Comparing the fuel consumption of different heaters based on their specifications can help you make an informed decision.

Size and Weight

Another aspect to consider when selecting a diesel heater is the size and weight of the unit. A compact and lightweight heater is beneficial, especially for smaller boats with limited space. Moreover, a smaller unit is generally easier to install and maintain. Make sure to review the dimensions and weight of different diesel heaters to ensure they would fit well in your boat's allocated space.

Additional Factors

Apart from heating capacity, fuel efficiency, and size, some additional factors to consider include:

• Ease of installation : Look for a diesel heater that can be easily integrated into your boat's existing fuel system, making the installation process more straightforward.
• Reliability : Opt for a heater from a reputable brand known for its build quality, performance, and reliability, such as  Webasto .
• Functionality : Consider a diesel heater with a digital timer that offers instant access to functions and allows for stepless modulation of heating.

By carefully considering these factors, you can find the best diesel heater for your boat.

Installation Process

Tools and equipment.

Before starting the installation process, gather all the necessary tools and equipment. These may include screwdrivers, wrenches, drill bits, a fuel line, insulation, ducting, a mounting plate, a wiring harness, and other relevant items. Ensure everything is ready and close at hand to make the process smooth and efficient.

Location and Mounting

Selecting the right location for your diesel heater is crucial, as it will impact its performance and safety. Choose a well-ventilated area, preferably in the sleeping quarters, as these will be the primary beneficiaries of the heat. Once the location is decided, place the heater on a mounting plate as close to horizontal as possible. This will ensure stability and accessibility.

Fuel and Exhaust System

The fuel system involves connecting the fuel line, fuel filter, and fuel pump. Choose a quality fuel line that's compatible with diesel, and install a fuel filter to prevent any impurities from entering the heater. Install the fuel pump in such a manner that it's as low as possible, allowing gravity to feed fuel to your heater.

Additionally, proper exhaust system setup is essential for heaters' smooth operation. The exhaust pipe must be lagged with insulation and sheathed in protective  ducting . Ensure that the exhaust pipe has a suitable path to the outside of the boat, and always follow the manufacturer's guidelines for proper installation.

Electrical Connections

Connecting the electrical components of the diesel heater is a critical part of the installation process. This includes the wiring harness, control panel, and power connections. Ensure the wiring is run cleanly and securely fastened, avoiding high heat or chafe-prone areas. The air inlet for combustion should pass through a  silencer  to reduce noise during operation.

Once all connections are made, double-check everything for security and proper installation. Following the guidelines mentioned above will ensure a successful and efficient installation of your diesel heater.

Operation and Control

Control system and thermostat.

Modern diesel boat heaters include advanced control systems to help maintain a comfortable cabin temperature. The control system often features a thermostat that continuously monitors the interior temperature, adjusting the heat output according to the pre-set temperature  requirements . A few popular diesel air heaters, like the Eberspacher Espar Airtronic S2 D2 L, come with an EasyStart PRO 7 Day Timer for improved control and convenience.

The thermostat helps maintain a constant temperature inside the boat. Most diesel heaters have an LCD display on their thermostats, making it simple to monitor and adjust the settings as needed. Some models offer a separate, remote thermostat, allowing for more precise temperature control in different sections of the boat.

Timers and Remote Options

Timers and remote control options for diesel boat heaters increase the convenience and efficiency of heating systems. A timer allows users to program the desired heating schedule for the week, activating the heater before occupancy, ensuring the boat is warm when required. The  EasyStart PRO 7 Day Timer  is an example of an advanced timer that offers full control over when the heating system will be active.

Remote control options for diesel air heaters are available in various versions, including wireless and smartphone app-based control. These options allow boat owners to remotely monitor and adjust the heater's settings without being physically present by the control system. As a result, remote control options provide added comfort and control, allowing boat owners to preheat their boats even when they are onshore or away.

In summary, diesel boat heaters with advanced control systems, including thermostats, timers, and remote control options, enhance the user's comfort and make operating the heating system more efficient. By incorporating these features, boat owners can ensure a comfortable cabin temperature while optimizing fuel consumption and reducing emissions.

Safety Precautions

Carbon monoxide monitoring.

It is crucial to install a  carbon monoxide alarm  in any space where a diesel heater is in use. Carbon monoxide is a colorless, odorless gas that can be lethal in high concentrations. Regularly check and maintain the alarm, ensuring it is in proper working condition.

Proper Ventilation and Insulation

Proper ventilation is essential when using a diesel heater on a boat. Ensure adequate  venting and outlets  for fresh air intake and exhaust. Follow the manufacturer's guidelines for safe installation and operation. Insulate the heater and its components to prevent heat loss and improve efficiency, taking care not to obstruct any airflow or ventilation points.

When installing a diesel heater, be sure to place it in a separate locker, away from any cabin space, to reduce the risk of accidents or exposure to dangerous substances. Install your heater as close to horizontal in both planes as possible, as most heaters are designed to work best in this orientation, and place it in a location where it is accessible for regular inspection and maintenance.

Overheating Prevention

Preventing overheating is another essential safety precaution when using a diesel heater on a boat. Ensure that the heater's thermostat is functioning correctly and that its temperature settings are within safe limits. Regularly inspect the heater's components, such as the combustion chamber and exhaust system, for signs of wear or damage that could lead to overheating. Keep any flammable materials or substances away from the heater and avoid overloading the heater with too much fuel or running it continuously for long periods.

Familiarize yourself with the signs of an overheating heater, such as unusually high temperatures or excessive noise, and address any potential issues immediately. By adhering to these safety guidelines and the manufacturer's recommendations, you can ensure the safe and efficient operation of your diesel heater on your boat during cold weather.

Maintenance and Troubleshooting

Routine service and cleaning.

Regular maintenance of diesel heaters for boats is essential to ensure their optimal performance and longevity. It is recommended to check and clean the heater's components every season, especially before winter when you are more likely to rely on it for warmth.

Some important routine service tasks include:

• Inspecting and cleaning the air intake and exhaust systems to remove any debris or buildup that could obstruct air flow
• Checking and replacing fuel filters, as a clogged filter can cause poor combustion and reduce efficiency
• Examining and cleaning the combustion chamber, ensuring there are no signs of wear or damage
• Testing the entire system for leaks, making sure all seals are tight and secure

Remember to follow the manufacturer's specific recommendations for maintaining your diesel heater, as different models and sizes may have unique requirements.

Detecting and Solving Common Problems

Even with regular maintenance, some problems may still occur with your boat's diesel heater. Being able to detect and address these issues can save you time, money, and potentially avoid more significant repairs in the future.

Some common diesel heater problems and their respective solutions include:

• Incomplete or poor combustion : This issue can be caused by a clogged fuel filter, blocked air intake, or insufficient fuel supply. Check and clean the filter, clear any obstructions, and adjust the fuel flow as necessary. A  balanced fuel-to-air mixture  is essential for a clean and efficient burn.
• Lack of heat output : If your heater is not producing the desired heat, it might be due to an issue with the thermostat. To test your thermostat, follow  these steps : Run thread through the valve, and boil it in water until it opens. Replace the thermostat if it is not opening correctly.
• Heater not starting : Problems with the electrical system, such as a dead battery or a malfunctioning ignition, might prevent your heater from starting. Ensure that your boat's battery is charged, and inspect the ignition system for any defects.

Always consult your heater's manual for specific troubleshooting guidance and seek professional assistance if you are unsure of how to proceed with any repairs. Proper maintenance and addressing potential problems promptly will help you enjoy the benefits of your diesel heater for many seasons to come.

Diesel Heater Brands and Providers

There are numerous diesel heater brands available for boats that offer different levels of performance, reliability, and price points. In this section, we'll explore some of the top brands and providers of diesel heaters for boats .

One of the most popular diesel heater brands is  Eberspacher Espar , which offers a range of heaters such as the Airtronic S2 D2 L 12V 2.2kW (7500 BTU) with EasyStart PRO 7 Day Timer. Known for their reliability and efficiency, Eberspacher heaters are ideal for boats up to 38 feet in length.

Another notable brand is  Webasto , which provides a more affordable lineup called the Air Top series. These diesel heaters come with a 3-year warranty and are compatible with diesel, kerosene, and gasoline. They offer various heating power levels suitable for different boat sizes.

In addition to well-known brands, there are reputable providers that offer a wide range of diesel heaters for boats.  Fisheries Supply  is a premier supplier of marine diesel heaters and stoves from top brands, along with necessary dampers and installation parts. They cater to various budgets and boat sizes, making it accessible for boat owners.

Another provider is  Go2marine , which offers a selection of diesel heaters for sale, including products from Dickinson Marine and Lofoten. These heaters come in different sizes and styles, such as floor-mounted and fireplace-style models.

For online shoppers,  Amazon  provides a platform for buying diesel boat heaters from various brands and suppliers, allowing customers to compare prices, read reviews, and choose the best option for their boats.

Here's a summary of diesel heater providers and the heater options they offer:

• Eberspacher Espar: Airtronic series, ideal for boats up to 38 feet
• Webasto: Air Top series, compatible with diesel, kerosene, and gasoline
• Fisheries Supply: Diesel heaters, stoves, dampers, and parts from top brands
• Go2marine: Dickinson Marine, Lofoten floor-mounted and fireplace heaters
• Amazon: A platform for comparison and purchase of various diesel heaters

By exploring these diesel heater brands and providers, boat owners can find the most suitable heating solution for their vessels while considering factors such as reliability, efficiency, compatibility, and price.

The research team at Sea Magazine is constantly doing in-depth research regarding marine technology, products & information we know you will find helpfull!

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Want to find the best boat heater for your yacht? We explain the pros and cons…

Extend the sailing season or venture further north by fitting a boat heater.

Ready to buy your boat heater now? Check out these great deals!

The humble boat heater has come on considerably since the old coal-fired bulkhead stoves of the last century. These days, the top selling brands are based on a remote diesel burner that heats fresh air via a heat exchanger and uses a powerful fan to circulate that hot air around the boat through insulated ducting.

This system has the advantage of running off the same tank as your main engine, using a fuel which is generally not considered dangerous to handle because it does not ignite easily. The combustion unit can also be positioned somewhere conveniently out of the way – it doesn’t have to be below.

There is another option in the form of propane/butane heaters. They also blow hot air around the boat, but run from the boat’s cooking gas supply. Some can also be usefully hooked up to 230V power to run off the shore supply when you’re in a marina.

Finally, there is a range of more traditional stove-type heaters for mounting against the boat’s bulkhead. These run on diesel, paraffin and even kerosene, but the combustion takes place in the space to be heated, with dangerous gases vented via a chimney.

Eberspächer Airtronic Air Heater

Recommended for boats from 13ft up to 62ft, the Airtronic is available in four sizes, with the 2.2kW Airtronic D2 suitable for boats 13-32ft, the 4kW Airtronic D4 Plus for 26-99ft, the 5kW D5 for 39-49ft and the 8kW D8LC for 49-62ft.

The Airtronic blows warmed air into each cabin of the boat through a flexible duct system and is controlled by a thermostat in the saloon plus, in each cabin, vents (now available in white) that can be opened or closed to let more or less hot air through.

A smaller heater will burn about one gallon of diesel every 20 hours. All sizes need a 12V or 24V electricity supply. The number of cabins and heads on the boat dictates the number of outlets. Exhaust is usually via the transom, above the waterline, meaning the heater can be run while the boat is heeling.

Webasto Air Top

The German manufacturer makes three blown-air models that range from 2kW to 5.5kW in heat output.

The unit initially draws around 20A to heat a glow plug, which ignites the diesel (there is no compression, as in a car engine), but once it is warmed up consumption drops dramatically. It is, in fact, the fan that pushes the heated air around the ducting that consumes the most power. For the 2kW unit, this amounts to a total draw of between 1A and 2.5A at 12V, depending on how hard the unit is running. For the larger units (which work on both 12V and 24V), current draw can run up to 95W.

Webasto says its products don’t need annual servicing. The burner unit may need occasional cleaning, but frequency is determined more by the cleanness of the fuel used than by how regularly the heater is turned on.

Controls are simple to use, with the option of standard heating, fast heating, eco mode (low power consumption) and ventilation only. The more complicated control unit allows programmes to be set and enables a remote control that works up to 1,000m from the boat.

It makes great play of the units’ quietness and relative low power consumption. Thanks to what Wallas calls a ‘laminar’ burn, the mix of fuel and air is very precisely controlled for cleaner combustion and no noise.

It requires the same high start-up current as the Webasto and the Eberspächer, but the ongoing power demand is lower than the others because the fan uses less electricity.

It has an elegant controller that can either be flush- or bezel-mounted. The default mode uses thermostatic control, with a fast heat-up followed by a steady blow that keeps the temperature level. There is a manual override, a dryer mode with faster fan speed and a ventilation-only mode.

You can buy a remote-control gadget (£375.82) that plugs into the control unit and allows you to operate it from your smartphone via the mobile network.

There are also kerosene/paraffin versions available, but these are aimed at the inland market, where the main engine doesn’t use diesel.

Propex Heatsource

Propex heaters come in two models – one rated at 2kW and the other 2.8kW. There is a ‘dual fuel’ option for the smaller heater, which allows it to be run off mains electricity as well as gas. At 230V, the heater draws a reasonable 9A of power to reach its full 2kW output.

The drawback to this unit is that it gets through gas far more quickly than you’d consume diesel. The standard 907 Campingaz bottle found on many boats would give just 19 hours’ burn time on the small heater and only 12 hours on the 2.8kW model. This might be acceptable for occasional use or where your boat has a larger gas bottle.

An important difference from diesel heaters is that the only exhaust is carbon dioxide and water vapour, which Propex claims makes it odour-free and more environmentally friendly. And because gas ignites easily, there is no need for glow plugs with a high start-up current. The only power needed is for the fan, which draws a fixed 1.4A in the small heater or 1.9A in the bigger one.

As with the Webasto, the microprocessor keeps the fan speed stable no matter what the battery voltage, and with the balanced fan and ball-race bearings, this is a quiet operator.

Dometic Origo 5100

“Enough to extend the season by a couple of weekends,” says Stuart Jones of Dometic.

Free-standing and unventilated, it will produce heat but also water vapour and carbon dioxide. It is sold in many chandleries.

A staple in the classic yacht world, Refleks is the Danish specialist in free-standing diesel heaters, which radiate heat directly in the cabin. Their units range in power from 1.6kW to 5.8kW and will take the chill off very quickly. They need careful positioning to keep them adequately ventilated, plus a fresh air intake and a chimney to vent exhaust, making installation more complicated. Will not run for long periods heeled.

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Better Sailing

Best Boat Heaters for Your Winter Trip

Planning on going for a fishing trip or sailing across the ocean this winter? Well, your cabin would definitely need some warming up. Not to worry! Here is our guide to buying the best boat heater for winter. These boat heaters are used to keep the insides of your boats warm, cozy, and largely unaffected by the harsh winter conditions of the open sea.

Having the best boat heater will not only help you comfortably enjoy the winter weather but will also let you extend the sailing season by cruising farther up north. It might not be easy to pick a boat heater out of all the options available. That is why we have compiled a list of the best boat heaters for winter and included in-depth reviews so you can pick one that suits your needs. First, let’s start with understanding the functionality of boat heaters.

How Do Boat Heaters Work?

There are different kinds of boat heaters that run on different kinds of fuels. The most recent ones consume diesel for combustion and use the power supply to run their fans and circulate hot air through the cabins.

The other types of fuel include LPG-propane or butane for combustion. These are considered more environment-friendly because they consume less energy. However, this type of boat heaters can use up a lot of gas in a short amount of time. Thus, before setting up sail, if you are using a gas-consuming boat heater, you need to ensure that you have a sufficient amount of cylinders available.

Basically, these boat heaters run on a remote diesel burner which produces hot, fresh air inside and circulates it by the help of a powerful fan through insulated ducting. Technology sure has come a very long way since the coal-fired stoves of the Titanic era!

There are also the simplest of them all but they only work if you have a reliable power source like a power outlet at the marina or a boat generator when out and about. Of course, I am talking about electric boat heaters. These are the easiest to set up, operate and the truth is that they are very effective in warming up your boat.

Also, most boats are easy to heat because spaces are small and they are made of fiberglass which provides excellent insulation against the cold weather.

Well, without any more musing, here is our list of the five best boat heaters for you to use on your next boating trip:

Best Boat Heaters for Winter

Dickinson marine newport propane fireplace – best overall boat heater.

If you are looking for the best boat heater out there then look no further than the Dickinson Marine Newport P9000 Propane Fireplace . This is a solution for people who sail/boat a lot during the winter and are looking for something permanent and serious. This boat operates with propane but the combustion process is completely isolated from the inside of the boat. It also has a built-in blower that provides good heat circulation throughout the boat; however, the blower requires additional power but it is not necessary for the heater to operate. This is a great heater but you do need to have it permanently installed and have holes drilled on your boat for the chimney.

If you looking to keep your boat warm and cozy during the winter seasons and for that fireplace ambiance to set the mood but you are not afraid of drilling holes in your boat, then you should definitely go with this boat heater.

• Very efficient
• Nice fireplace ambiance
• Built-in blower for hot air circulation
• Easy to install and easy to use
• Unaffected by motion or wind
• Variable heat output
• Low fuel consumption
• You have to drill holes in your boat
• It does not self-ignite
• No thermostat to regulate automatically

Note: You will also need a propane hose (make sure to buy one long enough for where you plan to place your propane tank), 11″ WC regulator and fittings are needed and sold separately

Mr. Heater Big Buddy Propane – Best Portable Boat Heater

Mr. Heater Big Buddy Propane Heater is ideal for boat spaces up to 450 square feet. It is safe for indoor and outdoor use, clean-burning, and nearly 100% efficient. It will automatically shuts-off if tipped over so it is perfect to use in sailboats that tipping over is common. Also, this heater has a built-in fan that increases its heating capacity. It fun operates with batteries so make sure you have some to make sure the unit is fully operational and operates at maximum efficiency. The fun increases the efficiency of the heater but is not necessary for operation. Also, a great feature of this boat portable heater is that you can use it with both a 1-lb propane bottle and a 20 or 30 lb propane tank.

• Indoor Safe
• Battery operated fan
• Push-button ignition
• Automatic turn-off if tipped over or oxygen level drops
• If used without the fan on high it can overheat and smell

Caframo Limited True North – Best Electric Heater For Boats

The Caframo Limited True North electric heater comes with a built-in adjustable thermostat that keeps will keep your boat cabin warm even on very cold nights. Great to use if you have a reliable power supply like a boat generator or you are docked in the marina and connected with their power outlet. This electric boat space heater comes with 5 power settings including steady heat to high output for maximum air circulation. Also, the heater shuts off when it reaches the desired temperature.

• Overheat protection
• 5-year warranty
• Anit-freeze Setting

Eberspacher Espar Airtronic 12V Boat Heater

This air heater comes in four different sizes which can effectively warm the interior of boats ranging from 13ft to 62ft. Each size of heater is suitable for a different size of boat.

The Airtronic Air Heater uses a flexible duct system to blow the warm air inside the cabin. This heater can be controlled through a thermostat. It also contains a vent that can be opened or closed to let more or less hot air pass through. Because the exhaust of this heater is situated above the waterline, it will work even if the boat is heeling. It is easily one of the best boat heaters available and one of the oldest brands in this industry. Not to forget, it is very reliable and steamed (pun intended!) as well. That being said, it is also priced above all the other boat heaters.

You can get it here .

Webasto Air Top

Webasto is a brand that frequently rivals Wallas and Eberspacher in the boat-heater industry. These boat heaters are produced in Germany. The products range from 2kW to 5.5kW in heat output. The Webasto Air Top initially consumes a lot of energy to ignite, but then consumption levels drop dramatically.

It provides a lot of control options such as fast heating, standard heating, eco mode, and ventilation. Webasto also maintains that its products do not require annual servicing. The frequency of servicing depends largely on the cleanliness of fuel rather than how much the heater has been used.

Wallas Boat Heater

Wallas is a brand from Finland and is considered to be best suited for northern boating conditions. These air heaters come in different output options ranging from 2kW to 4kW. They are said to be suitable for boats up to 50ft in size.

These heaters take up as much energy to start as the other brands mentioned above (Webasto and Airtronic). However, its sustaining power consumption is relatively lower as compared to the others. This is because Wallas fans need much less electricity to work. There is very little noise and combustion so the air and fuel are said to be precisely controlled when using this boat heater.

Its control options are elegant. The default mode uses a thermostat control with fast heating followed by steady temperature control. It can be changed to dryer mode, manual override, and ventilation only mode.

You can find it here

Planar Boat Heater

Planar is one of the trusted, upcoming names in the boat-heater market. These heaters are targeted towards the BC boats. Their diesel air heaters function in the same way as Airtronic’s or Wallas’. Since it is a newer brand as compared to the other two, it is also lesser in price. Planar first produced air heaters for trucks which gave them a loyal following in Canada. Now, they have started venturing into the boat heater industry as well and are considered reliable.

The company has introduced a new rotatory controller for using its options as well as made a remote-controlling app so the heater can be handled through a smartphone. Their products come in different sizes and different heat output choices.

You can also browse through other products within the diesel boat-heaters category to find out the one that is best suitable for your boat’s size and built.

Best Boat Heater For Winter – Conclusion

That was our list of the best heaters for boats. You can use any of these to keep your cabin warm and cozy while you enjoy the winter up north! We hope you find one that is most appropriate for your boat’s size and built and fits your budget. All in all, these are the best brands in the industry. However, whichever boat heater you choose, please make sure that you have sufficient fuel (diesel or any other gas) to cover the entirety of your trip. In fact, keep some extra. You never know when the water may turn its tide against you. It is always a good idea to be well prepared, especially for a cruising trip! While you’re there, you can catch a fish or two outside and then enjoy in your warm cabin!

Peter is the editor of Better Sailing. He has sailed for countless hours and has maintained his own boats and sailboats for years. After years of trial and error, he decided to start this website to share the knowledge.

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Marine heating systems

Explore our range of marine heating systems, designed to enhance comfort and warmth on board, catering to various needs and boat sizes.

Enhancing on-board comfort

Marine heating systems by Webasto offer a blend of efficiency, reliability, and convenience, ensuring a warm and comfortable environment on your vessel.

Quick heating

Experience rapid warmth with our marine heaters, ensuring a cozy environment in no time, even in the chilliest conditions.

Silent operation

Enjoy peace and tranquility on board with our heaters’ silent operation, enhancing your marine experience.

Compact design

Save valuable space on your vessel with our compact and efficiently-designed marine heating systems.

Low operating costs

Benefit from economical heating solutions with our marine heaters, ensuring low operating costs without compromising on warmth.

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Our comprehensive installation kits make retrofitting simple and quick, ensuring a hassle-free setup process.

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Practical Boat Owner

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Best boat heaters – diesel, solid fuel or warm air central heating?

• Rupert Holmes
• January 20, 2021

Choosing the best boat heater depends on a number of factors, explains Rupert Holmes, and you should also have a marine-compliant carbon monoxide detector

Diesel fuelled heating systems

Having a warm boat can significantly lengthen the sailing season, but the best boat heater for you depends on budget, the size of your boat, and whether or not you wish to install it yourself. In many cases fitting a commercially produced heating system can now be less expensive than it has been for decades. Part of the reason for this are the Autoterm diesel fuelled heating systems that sell for a fraction of the price of more established brands. And there are even cheaper unbranded heaters available online, though these rarely have type approval that’s valid in the UK or the EU, which makes installing one a risk that may not be covered by insurance. At the top end of the market the very best units have become even more efficient and quiet.

Solid fuel heaters

In my view, however, the first step in fitting heating is to consider whether a basic solid fuel unit might be all that’s required. I have a very simple charcoal heater on Ammos , my 30ft Discovery 3000 in Greece. It’s certainly not as convenient as a more sophisticated warm air type system, but took only two hours to fit, needs next to no maintenance and a €5 bag of lumpwood charcoal lasts the best part of a week in the depths of winter. On the downside it takes around half an hour to warm up, so a cold morning necessitates lighting the heater, then going back to bed to read the news. And enough fuel for extended periods is bulky and difficult to stow. The UK-built type I have is no longer produced, but the Newport Dickinson range offers good alternatives at reasonable prices.

A simple charcoal heater is quick to fit and can transform life on board

Multifuel stoves can also be good in larger boats, but the advantage of a charcoal heater is the compact flue – with a diameter of around 11∕2in (4cm) this is easier to fit and far more compact than the 4in (10cm) flue needed for burning wood.

Paraffin heaters

Paraffin heaters and drip-fed diesel stoves are less common these days, but are more convenient than solid fuel stoves as the fuel has a much higher energy density, making it easier to stow. It has to be remembered that every appliance that burns fuel is potentially lethal. By opting for a properly installed, type-approved product you minimise the chances of death through carbon monoxide poisoning.

Carbon monoxide alarm

Any heater that burns fuel, whether diesel, gas, timber or charcoal, has the potential to emit carbon monoxide, a clear and odourless gas that can kill. It’s therefore important to fit carbon monoxide alarms. Domestic models are not recommended – look for units that conform to the EN 50291-2:2010 safety standard and are specified as suitable for marine use (the standard also covers caravans and motorhomes). My preference is an alarm that also has a digital read-out, as levels can be monitored before the alarm is triggered.

Buy a Kidde boat-compliant carbon monoxide alarm on Amazon (UK)

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Warm air central heating.

A key advantage of warm air central heating type systems is they’re quick to warm up and can also be fitted with a timer, or remote control, for automated operation. The price gap for these systems compared to solid fuel has reduced, but disadvantages include the time needed for installation and their consumption of electricity. If doing the installation yourself, plan exactly where every element of the system needs to be located, then allow a full weekend with a helper for fitting. Newer models are much more efficient in their use of electricity, especially the latest units from Eberspächer, than those of two or three decades ago and are also quieter in operation. We also have more forms of generating power than 30 years ago and my experience on the south coast of the UK consistently says a 100W solar panel will usually cover the electrical requirements of a 4kW unit for two or three days a week, even in the depths of winter.

Buy a 100W solar panel on Amazon (UK)

Reliability has also been a long-running worry for many, but this shouldn’t be a concern for carefully installed systems maintained according to manufacturers’ schedules. It’s worth noting that many problems are associated with a build-up of carbon at the business end of the unit. As this is accelerated when the device is running at low power it’s often worth resisting the temptation to fit an over-sized device – a smaller one that’s run hard may be a better long-term option.

Reliability problems can also stem from wiring. A couple of years after installation the heater on Zest, my partner’s 36ft-footer, became difficult to start up. When trouble-shooting we measured the voltage at the unit – despite the 4m wiring run being within specification, there was a 1.5V drop over the length of the wires. Replacing this with oversized wiring two sizes larger solved the issue at a stroke.

Spending time on board out of season means condensation can be as big a problem as keeping warm. If only the saloon is heated, warm, moist air that escapes into cold cabins, heads compartments and lockers will create large amounts of condensation in these areas.

Ensuring heat can reach as many parts of the interior of the boat as possible is therefore important and confers a clear advantage to systems that duct heat to every area on board. Beyond that, either good ventilation or a dehumidifier is important to keep condensation at bay.

• How to check your rig while the mast is down over winter
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10 Best Marine Boat Heater Reviews

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Table of Contents

• Best Overall: Eberspacher Espar Airtronic Marine Diesel Heater (D2, D4, D5)
• Runner Up: Mr. Heater Big Buddy MH18B Portable Propane Heater
• Best Value: Caframo Limited True North Electric Space Heater

DuraHeat DH2304S Portable Kerosene Boat Heater

Chinese diesel heater, heater craft 203hc hydronic heater.

• Webasto FCF 12000 Reverse Cycle Heater & Air Conditioner

Dickinson Marine Cozy Cabin Propane Heater

Dickinson marine diesel heater (newport, alaska), dickinson marine 00-newsf newport solid fuel heater.

• Buying Guide

With so many marine heaters to choose from, finding the right one for your boat can be challenging. That’s why we put together this list of our top ten. We considered price, fuel type, and heat output during our review process. Let’s get to it.

Eberspacher Espar Airtronic Marine Diesel Heater (D2, D4, D5)

Often the go-to heater for campervan conversions, the Espar forced air diesel heater now comes in a marine kit that makes boat installation much easier.

The D2, D4, and D5 models are essentially the same heater but have different heat outputs that are meant for different sized boats. The D2 being the smallest of the three, followed by the D4, and finally the D5 producing the most amount of BTUs and meant for larger vessels.

With easy-to-follow instructions and high quality parts, installation is simple and reliable. The heater’s fuel line connects directly to your boat’s diesel tank and its compact size allows it to be mounted almost anywhere.

It has automatic stepless heating and, once the desired temperature is set with the digital controller, takes just three minutes to start producing warm air. It’s an easy, hands-off approach to keeping your boat cabin warm.

Key Features
Automatic stepless heating
Compatible with all boat sizes
Digital controller displays ambient temperatures
Reputable company with high quality parts
Easy installation

Heater Type: Forced Air (Diesel) Heat Output: 7,500 BTU (D2), 13,650 BTU (D4), 18,800 BTU (D5) Heating Area: 470 sq.ft.

Mr. Heater Big Buddy MH18B Portable Propane Heater

The Mr. Heater Big Buddy is the best portable propane heater on the market. It’s small, compact, and has two hookups on each side for 1 lb propane tanks, allowing you to move the heater around with ease. If you’d rather connect it to a larger propane tank then you’ll want to use the compatible 10’ hose which also eliminates the need for a fuel filter.

There are three heat settings, the highest of which puts out 18,000 BTUs and can heat a 450 sq/ft area with ease. When equipped with two one-pound tanks, the heater will last anywhere between 3-12 hours depending on the heat output setting. This translates to about 6-24 hours on a single gallon of propane.

For simplicity, it has a single control knob which acts as a non-electric ignition switch as well as a temperature controller. Once lit, it gets hot very quickly and the integrated fan helps circulate warm air throughout the cabin.

The Big Buddy is also one of the safest heaters available. It has an automatic low oxygen shut-off system that shuts the heater down if there is a dangerously low amount of oxygen in the air. It also has an accidental tip over switch that turns off the heater if it’s not sitting upright.

Note: Due to tariff requirements, the fan has been removed on some models of the MH18B for residents of Canada and the state of Massachusetts. Please check with the seller before purchasing.

Key Features
Gets hot quickly with 18,000 BTUs
Small and portable
Accepts one-pound tanks or can connect to a larger tank
Multiple safety shut-off systems

Heater Type: Propane Heat Output: 18,000 BTU Heating Area: 450 sq/ft

Caframo Limited True North Electric Space Heater

The low profile Caframo 1500W electric heater is built with a solid steel housing for added durability and moisture protection. It features a heat/fan output dial as well as a temperature dial. The heater will automatically cycle through an on/off state to maintain the set room temperature. It even has an anti-freeze setting that automatically kicks in at 38ºF.

It uses a standard 120V plug, which means that you’ll either need to be docked or using an on-board inverter generator to produce enough electricity to run it. It doesn’t put out a ton of heat, but it gets the chill out of your room without having an open fire or a tank full of fuel.

Key Features
Low profile design prevents tipping
Safer than having an open flame on the boat
Stepless heating with automatic temperature control
Durable solid steel construction
Anti-freeze setting for winter

Heater Type: Electric Heat Output: 5,200 BTU Heating Area: 130 sq/ft

The DuraHeat runs on kerosene and produces a whopping 23,800 BTUs – that’s enough to heat 600 sq/ft! Your boat cabin probably isn’t that big, but with that many BTUs you can crank it to full blast on a chilly night and heat a room very quickly.

It features a wick knob that lets you manually adjust the height of the wick without having to open up the heater. It can either be lit with the electric ignition switch, which runs on C batteries, or it can be lit with a match or lighter through the small opening in the front. Just be sure to burn type 1-k (K1) kerosene. It’s the purest grade of kerosene, it has no scent, and it’s safe to burn indoors.

With an integrated 1.9 gallon tank, the DuraHeat can last up to 12 hours on a single tank of fuel. That means you won’t be getting up in the middle of the night to add fuel like you would be with other marine heaters.

As if that weren’t enough, it’s also portable. You can move it to any area of the boat you prefer and, when the season’s over, you can store it in your house for a power outage emergency.

Key Features
Produces a lot of heat (23,800 BTU)
Lasts up to 12 hours
Portable
Quick-start ignition
Easy wick adjustment

Heater Type: Kerosene Heat Output: 23,800 BTU Heating Area: 600 sq/ft

If you’re dead-set on a forced air heater but don’t want to pay an arm and a leg, then you may want to look into a Chinese diesel heater. They’re an affordable alternative to the Webasto and Espar heaters at around one tenth the cost.

This is an all-in-one floor mounted unit with an attached fuel tank. With a heat output of over 17,000 BTUs, it’s capable of heating a 425 sq/ft area.

If you plan on staying below 5,000 ft and don’t need to heat such a large area then we recommend the 3kw diesel heater by HappyBuy. It’s more compact and can be installed in tighter areas.

We recently reviewed the best forced air diesel heaters and found that while Chinese diesel heaters are an affordable alternative to Webasto and Espar heaters, they’re priced that way for a reason.

They’re able to produce such affordable heaters because they use cheap parts. This can cause some parts to break or not fit together correctly, which can be a bit of a hastle.

We’re not saying to avoid diesel heaters from China. In fact, many people have never had issues with them, but it’s important to know the risks.

Key Features
Cheap and affordable
LED display controller and key fob remote
Automatic altitude adjustment

Heater Type: Forced Air Heat Output: 17,060 BTU Heating Area: 425 sq/ft

The Heater Craft 203HC is a hydronic heater that’s compatible with I/O and inboard engines with either a closed freshwater or open raw-water cooling system. It’s made in the USA with durable powder coated materials that withstands moisture and prevents corrosion. It comes with a hot tube and euro-style vent, as well as a 25’ hose for easy installation.

The best feature of the Heater Craft is that it generates an enormous amount of heat (28,000 BTU) which is capable of heating a 700 sq/ft area. Once installed, you’ll never have to worry about uneven heating again.

Key Features
Made in the USA with high quality materials
Powder coated to prevent rust and corrosion
Compatible with inboard/outboard and inboard engines
Easy installation
Generates 28,000 BTU for heating large areas

Heater Type: Hydronic Heat Output: 28,000 BTU Heating Area: 700 sq/ft

Webasto FCF 12000 Reverse Cycle Heater & Air Conditioner

The Webasto FCF 12000 is a 12,000 BTU air conditioner with a reverse cycle for heating. It cools your cabin down on blistering hot days and warms your cabin up well into the colder months. It also has a dehumidifier setting to remove unwanted moisture.

It’s built with an ultra-quiet compressor that’s been carefully mounted to reduce noise and vibration, allowing for a relaxing night’s sleep. The baked-on enamel finish prevents corrosion from seawater and the powerful blower can handle multiple vents. It also comes with a digital controller so you can monitor and adjust the indoor climate to your liking.

It’s more expensive than the other heaters, but it’s an all-in-one heating and cooling system that ensures you’re comfortable no matter where your boat may take you.

Key Features
Capable of heating or cooling your cabin
Dehumidifier setting helps remove unwanted moisture
High quality enamel finish
Silent compressor won’t disturb your sleep
Digital controller for temperature adjustments

Heater Type: Heater & Air Conditioner Combo Heat Output: 12,000 BTU Heating Area: 300 sq/ft

The Dickinson (formerly Sig Marine) Cozy Cabin is a bulkhead mounted propane heater with a 5,000 BTU rating that’s capable of heating a boat cabin up to 125 sq/ft. The brass base, stainless steel body, and cast iron top are durable and built to withstand moisture.

The open flame design gives it the feel of a fireplace and allows for lighting with the ignition switch or with a match. It runs on low-pressure propane so you may need to purchase a low pressure regulator hose . You’ll also need to pick up a 1” stainless steel exhaust pipe , as the unit does not ship with one.

It’s quiet, small, and perfect for heating a small boat. We recommend installing a small fan next to the Cozy Cabin to help circulate air.

Key Features
Made with brass, stainless steel, and cast iron
Durable construction that withstands moisture
Automatic shut down if oxygen levels drop below 95% of normal
Quiet
Bulkhead mounted

Heater Type: Propane Heat Output: 5,000 BTU Heating Area: 125 sq/ft

Dickinson Marine offers two variants of their diesel heater: the bulkhead-mounted Newport (00-NEW) model and the floor-mounted Alaska (00-ALA) model. They’re essentially the same heater but with different mounting options.

They’re small, economical heaters that use just 3.2 gallons of fuel per 24 hours on their highest setting and can heat up to 405 sq/ft. Not only can it burn diesel, but it can be re-calibrated for kerosene or stove oil, giving you plenty of options for heating your vessel.

Built with simple yet reliable components like a gravity feed oil metering valve to a vaporizing oil burner, these heaters produce a clean burn that’s beautiful to look at through the viewable combustion chamber. Coupled with a steady dry heat, they mimic a warm and cozy fireplace.

Key Features
Accepts diesel, kerosene, or stove oil
Economical fuel consumption
Bulkhead or floor-mounted
Easy installation
High quality parts and components

Heater Type: Diesel Heat Output: 16,250 BTU Heating Area: 405 sq/ft

The Dickinson Newport is a small stainless steel solid fuel stove that can heat up to 200 sq/ft of cabin space by burning wood, presto logs, charcoal briquettes, or coal.

It has a sliding viewing window so you can keep an eye on your fuel, as well as a removable ash tray for easy cleaning. The damper knob on the ash tray allows you to control the air flow to the fire in order to adjust how hot the fire burns.

Installing the stove is easy since you have the option of installing it to a hearth on the floor or to a bulkhead. It requires a 2” air gap from the wall and a 3” diameter vertical exhaust pipe.

While it’s capable of burning wood and presto logs, we found that wood-based fuel burns too fast. Charcoal briquettes and coal are a much better option, as they burn slower and can last through the night.

Key Features
Small and compact
Can be mounted to the floor or bulkhead
8,000 BTUs can heat up to 200 sq/ft
Can burn charcoal and coal
Removable ash tray

Heater Type: Solid Fuel Heat Output: 8,000 BTU Heating Area: 200 sq/ft

How To Find The Best Boat Heater – Buying Guide

There are four main types of heaters to choose from to warm your boat: forced air, hydronic, electric, and fuel. Let’s go over each of them below.

1. Forced Air

Forced air heaters are typically installed in the engine room and operate on diesel fuel. An integrated sensor reads the interior temperature and, if it’s lower than the desired temperature, sends a mixture of diesel and air to the combustion chamber where it combusts and heats the heat exchanger. The combustion exhaust is ducted outside while the warm air from the heat exchanger is ducted to the cabin with the help of a 12v fan.

Pros	Cons
Small and compact for installation in tight spaces	Requires large holes in bulkhead to install piping
Gets hot in less than five minutes
Connects directly to the boat’s fuel tank or a portable external tank
Automatic temperature controlled heating

2. Hydronic

Powered by diesel from your boat’s main tank, hydronic heaters pump hot water through a series of tubing to radiators on the boat. Heat is transferred from the hot water to the radiator, warming the cabin.

On some units, an integrated fan helps circulate the air for even heating. If integrated with the engine’s cooling system, the heater uses the engine’s coolant to heat the radiators. It can also run while the engine is off, allowing the heater to warm the engine in extremely cold temperatures.

Pros	Cons
Radiators can be installed in various cabins and separately controlled	Complex installation (may require a professional)
Small hoses through bulkhead during installation
Some models have the ability to heat potable water
Less heat loss over distance

3. Electric

Electric boat heaters are best suited for boats with an AC generator or when docked and connected to shore power. They essentially function as small space heaters for your cabin. The unit’s heat exchanger warms cabin air while the fan circulates it around the room.

We don’t recommend using an electric heater without a generator. Since you’d need to use your boat’s battery, you’d only be able to use a small 12v heater with the engine running. Unfortunately, 12v heaters don’t produce enough heat and you’d drain the battery if you ran it with the engine off.

Pros	Cons
They usually have a temperature control, fan, and built-in timer	12v heaters do not produce enough heat
Small and portable	Smaller boats may require a generator
Affordable

Perhaps the most popular way to heat a boat is with a fuel-burning stove. They burn either liquid propane, diesel, kerosene, or solid fuels like wood or charcoal. They’re either floor mounted or bulkhead mounted and require a vertical stovepipe exhaust to the outside of the ship. Most solid fuel stoves have a damper for airflow, allowing you to control how hot the fire gets and how much fuel it consumes.

It’s important to note that not all solid fuel stoves are rated for charcoal, as it burns too hot. The nice thing about diesel and propane stoves is that they can be connected directly to your boat’s fuel tank or propane source. You won’t have to refill the stove like you would with solid fuels.

Pros	Cons
Lots of fuel choices and stoves to choose from	Installation is semi-permanent
Easy installation
Heats up quickly
Gets very warm and puts out a lot of BTUs

Why Should I Heat My Boat?

Marine heaters allow you to extend the boating season into the colder months. Without being dependent on the weather, you have the freedom to travel wherever and whenever you want. They’re also a necessity for liveaboards during the winter. No one ever said boating had to be uncomfortable!

What Are BTUs And How Many Do I Need?

BTU stands for British Thermal Unit, which is a measurement of thermal energy. To get a rough estimate of how many BTUs you’ll need, multiply the square footage of an area by 40 BTUs. For example, a 100 sq/ft room would require around 4,000 BTUs to heat.

How Do I Keep My Boat Warm In The Winter?

In addition to investing in a boat cabin heater, the number one thing you can do to keep your boat warm in the winter is to properly insulate it with a foil barrier and closed-cell foam . Not only will it keep warm air in and cold air out, but with the help of a dehumidifier it will prevent mold and mildew from forming inside the cabin.

Another culprit for chilly cabins are air drafts. Be sure to find all the spots where air is coming into your cabin and either block them or seal them up. One spot you may not think to look are the sinks in the head and galley. They can act as a wind tunnel and suck out your cabin’s warm air.

Carbon monoxide detectors, smoke alarms, and fire extinguishers are essential to have on board your sailboat or motorboat, especially when using a heater. When installed correctly with proper ventilation, marine heaters are a safe way to stay warm, but installation mistakes can still happen so it’s better to be prepared.

It’s also important to never leave your heater unattended. There are countless stories of owners wet storing their boats with a space heater running 24/7, only to have it malfunction and catch not just their boat on fire, but neighboring boats as well. This is especially dangerous for any liveaboards nearby.

We hope that this review has helped you find the best marine heater. As you can see, there are plenty to choose from, each with their own unique features.

The best overall is the Espar series (ebay link) . It has automatic stepless heating, it has a digital controller, and installation is a breeze.

The next best thing is the Mr. Heater Big Buddy . It’s small and portable, it’s compatible with large propane tanks, and it puts out 18,000 BTU.

The best bang for your buck is the Caframo space heater . It’s made of durable steel, it has a low profile design, and it has stepless heating with automatic temperature control.

If none of these boat heaters fit your needs, then we also gave you seven great alternatives to choose from. Thanks for reading and stay warm out there!

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Boat, Cabin & RV Heater | Overheat Protection, Tip-Over Protection, Portable Heater | Boat Heater, RV Bay Heater

Brand	Xtreme Heaters
Material	Plastic
Item Weight	4.52 Pounds
Special Feature	Portable, Tip Over Protection, Overheat Protection
Mounting Type	wall mount, Wall Mount

About this item

• STAY COMFORTABLE: Xtreme Heaters portable heater is designed to keep your boat, cabin, RV or other small space comfortable & cozy.
• NO MORE WORRIES: Our unique quiet portable space heater draws air from the top, allowing you to place the heater against walls, on carpeted surfaces, while still keeping you safe & comfortable.
• STAY SAFE: This heater features quiet operation, a low profile & stable base that prevents tipping. But, accidents happen and if your heater falls or tips in any direction, it will automatically turn off with our new TIP-OVER SWITCH.
• BUILT FOR YOU: With the 750/1500 Watts heat settings, you can quickly warm your living space or efficiently maintain comfortable temperatures. Utilize the 6 foot power cord to give you more flexibility for heater placement.
• BUILT BETTER: Our Space heater with tip-over safety switch & automatic overheat protection is certified and tested with the UL 1278 standard.
• BUY THE BEST, BUY XTREME: Our mission is to build the safest, most reliable & most efficient heaters available. Our heaters are made for unmatched strength & durability. If you aren’t completely satisfied with your purchase, we will offer you a full refund or replacement

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Technical details.

UPC	‎895670001224
Manufacturer	‎XTREME HEATERS
Item Package Dimensions L x W x H	‎14.37 x 11.3 x 6.65 inches
Package Weight	‎2.05 Kilograms
Brand Name	‎Xtreme Heaters
Warranty Description	‎Warranty
Model Name	‎XTRCAB
Color	‎white
Suggested Users	‎unisex-adult
Part Number	‎xcabin
Included Components	‎Great Product
Size	‎One Size

Additional Information

ASIN	B083Y6Z8W6
Customer Reviews	4.2 out of 5 stars
Best Sellers Rank	#1,404,609 in Home & Kitchen ( ) #1,094 in
Date First Available	January 16, 2020

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NOT FOR USE IN ENGINE SPACES OR OTHER AREAS THAT MAY CONTAIN EXPLOSIVE FUMES, WATER OR HIGH LEVELS OF MOISTURE (CONDENSING)

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Customer reviews.

• 5 star 4 star 3 star 2 star 1 star 5 star 66% 14% 5% 0% 15% 66%
• 5 star 4 star 3 star 2 star 1 star 4 star 66% 14% 5% 0% 15% 14%
• 5 star 4 star 3 star 2 star 1 star 3 star 66% 14% 5% 0% 15% 5%
• 5 star 4 star 3 star 2 star 1 star 2 star 66% 14% 5% 0% 15% 0%
• 5 star 4 star 3 star 2 star 1 star 1 star 66% 14% 5% 0% 15% 15%

Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.

To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.

Customers say

Customers like the functionality, size, and quietness of the product. They mention it keeps the interior well above freezing, works well, and takes little room. Some appreciate the power saving. However, some customers feel the product is very pricey.

AI-generated from the text of customer reviews

Customers like the RV protection of the product. They mention it keeps the interior well above freezing, keeps the cold air at bay, and is great for wintering over.

"...from boat to boat (or boat to camper/garage), the heater and warmth can travel with you . VERY quiet, small, and does not get in the way- unobtrusive...." Read more

" Keeps rv warm " Read more

"...When I come to the boat, the cabin is cool, but not cold . When I turn on the diesel heat for the boat, the Xtreme heater turns off right away...." Read more

"Works well when I’m hooked up to AC. Quite, keeps camper warm , and save propane for when it’s the only source of heat." Read more

Customers like the functionality of the navigation compass. They say it works well.

" It works well " Read more

" Works well when I’m hooked up to AC. Quite, keeps camper warm, and save propane for when it’s the only source of heat." Read more

"...Simple, with only two knobs. Works just as designed. The thermostat works well on either a high or low heat setting...." Read more

"...Fan spun for maybe one second. Froze up and it is not inoperable with a slight metallic burning smell. Buy something higher quality...." Read more

Customers like the size of the product. They mention it's compact and powerful with auto shut-off and thermostat controls. Customers also say it takes little room and works well in smaller campers.

"...VERY quiet, small , and does not get in the way- unobtrusive. Cord is long enough that it is not hard to place, even with limited outlets...." Read more

"...in about 15 minutes on high....it is pricey but the small dimensions work very well in smaller campers and its easy to move around...." Read more

"This has been an awesome heater so far. It's so small & so quiet that it doesn't even seem like it would be able to warm up the room but it does...." Read more

" Compact and powerful with auto shut off and thermostat controls...." Read more

Customers appreciate the quietness of the navigation compass. They mention it's small and doesn't get in the way.

"... VERY quiet , small, and does not get in the way- unobtrusive. Cord is long enough that it is not hard to place, even with limited outlets...." Read more

"... Its a quiet unit . The unit heats adequately. I wanted a unit with a thermostat control. Its just okay in that regard...." Read more

"...Love the directional vent and the light weight and it is quiet . Cords too short. Please add more cord!" Read more

Customers appreciate the power saving of the product. They mention it's compact, powerful, and has auto shut-off and thermostat controls.

"...When I turn on the diesel heat for the boat, the Xtreme heater turns off right away . It is working as I had intended...." Read more

"Compact and powerful with auto shut off and thermostat controls...." Read more

"...Its low power and thermostat allows us to keep our cabin at above freezing while our boat is in the water...." Read more

"...It turns itself off when it gets to the temperature I set, and it draws air in a way that it won’t ever get blocked. Love this little heater." Read more

Customers appreciate the safety features of the product. They mention it's safe for marine spaces and can run 24/7.

"...the Xtreme bilge heaters I have used in the past, this heater has safety features lacking on the cheaper heaters...." Read more

"... Safe for marine spaces !" Read more

"...This heater had all the features and safety that we were interested...." Read more

"...in my boat, I did not have to winterize my boat this unit is safe to run 24/7 " Read more

Customers are dissatisfied with the value for money of the navigation compass. They mention it's very expensive.

"...temps....heats up the whole camper in about 15 minutes on high.... it is pricey but the small dimensions work very well in smaller campers and its..." Read more

"...Its just okay in that regard. Seems a little high priced for a "just okay," feature." Read more

"...definitely nothing Xtreme about this heater other than the extremely overblown price for what you receive." Read more

" A little pricey for what you get. I have heaters that cost 1/4 as much and work much better. Very disappointed with this purchase...." Read more

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