What Is A Diesel Heater?
A diesel heater is a compact, lightweight combustion chamber that uses diesel fuel to produce heat efficiently. These heaters are popular for campers, vans, and truck campers because they’re safe, and ideal for off-grid setups when installed properly.
Diesel heaters use very little fuel and consume far less power than traditional RV heaters, making them perfect for boondockers relying on solar power.
Related Product: We use a reliable Power Queen 100Ah Lithium Battery (click to view on Amazon) to power the diesel heater in our RV.
Originally made by German companies Webasto and Eberspächer (Espar), these high-quality heaters remain top-tier, though newer brands are gaining popularity.
In this post, I’ll cover some of the best options to help you find the right diesel heater for your setup.
See Also: Portable Vevor Diesel Heater (All-In-One) Review & Setup
Summary (Links to Amazon)
- Best Overall: Eberspacher Espar Airtronic S2 Diesel Heater
- Best Budget: Vevor 8KW Diesel Heater
- Most Portable: Vevor All-In-One Diesel Heater
Best Overall
Best Budget
Most Portable
Last update on 2025-05-17 / Affiliate links / Images from Amazon Product Advertising API
Best Diesel Heaters For Campers Reviews
1. Webasto Air Top 2000 STC Diesel Heater
Quick Facts
- Heating Power: 2kW (3,000–7,000 BTU)
- Dimensions: 21.5 x 14.9 x 8.4 inches
- Weight: 5.7 lbs
- Power Usage: 120 watts at startup, 14–29 watts during operation
- Altitude Limit: Up to 7,220 feet
- Noise Level: Quieter than many competitors
Product Overview
The Webasto Air Top 2000 STC is a premium diesel heater known for its compact size and marine-grade construction, designed to withstand humid conditions and deliver reliable performance. Originally crafted for boats, it has become a top choice for campers seeking durable, efficient heating in challenging environments.
A standout feature is its rapid startup, using only 120 watts briefly before transitioning to an efficient 14–29 watts, depending on fan speed. This makes it ideal for boondockers relying on deep-cycle batteries or solar setups. Its compact and lightweight design simplifies installation, even in tight spaces.
The kit, available through licensed dealers like Butler Technik, includes essential components such as a fuel pump, exhaust parts, and a user-friendly MultiControl panel with timer settings for up to seven days. While a fuel tank standpipe may need to be purchased separately, the heater offers exceptional versatility for RVs, vans, boats, and tiny homes. Quiet, fuel-efficient, and easy to use, it’s a reliable option for off-grid heating.
See Also: Best Heated Water Hoses For RV Campers, Barns & Livestock
My Verdict
The Webasto Air Top 2000 STC is a top-notch diesel heater that stands out for its durability, efficiency, and quiet operation. Its marine-grade design makes it ideal for humid environments, and the compact size is perfect for RVs, vans, and even tiny homes. Though slightly pricier than some competitors, its reliability and performance justify the investment.
Pros
- High-quality, durable construction.
- Compact and lightweight for easy installation.
- Efficient, quick heating with low power usage.
- Quiet operation and altitude compatibility.
- User-friendly controls with timer settings.
Cons
- Expensive compared to competitors.
- Fuel tank and standpipe not included.
- No smart app control.
- Advanced installation may need professional help.
2. Eberspacher Espar Airtronic S2 Diesel Heater
Quick Facts
- Heating Power: 2.2kW (2,900–7,500 BTU)
- Dimensions: 21.5 x 14.9 x 8.4 inches
- Weight: 17 lbs
- Power Usage: 120 watts at startup; 6–31 watts during operation
- Altitude Limit: Automatic adjustment up to 10,000 feet
- Noise Level: Quiet fuel pump and motor
Product Overview
The Espar Airtronic S2 is a compact yet powerful diesel heater that excels in reliability and efficiency, offering up to 7,500 BTU of heat output. Its lightweight design makes it ideal for small spaces like vans, RVs, and boats. Like the Webasto, it features a quick startup, consuming only 120 watts briefly before operating at a low power range of 6–31 watts, perfect for extended use with solar power or deep-cycle batteries.
What sets the Airtronic S2 apart is its built-in automatic altitude adjustment, enabling seamless operation up to 10,000 feet without additional components—a significant advantage for campers exploring high-altitude locations. The included LCD control panel and programmable 7-day timer make it easy to customize heating schedules and settings.
The heater operates quietly, thanks to its advanced fuel pump and motor design that minimizes ticking sounds common with budget models. The kit includes most installation components, but an external fuel tank or standpipe must be purchased separately if connecting to a vehicle’s fuel supply.
With its robust design, quiet performance, and advanced features, the Espar Airtronic S2 is a premium diesel heater that stands out as one of the best options for off-grid heating.
See Also: Mr. Heater Little Buddy Reviewed & Tested For Camping
My Verdict
The Espar Airtronic S2 is a reliable, efficient, and feature-rich diesel heater, perfect for campers and RVers who need consistent performance, even at high altitudes. Its quiet operation and built-in altitude adjustment make it a standout choice, though its premium price may deter budget-conscious buyers.
Pros
- Compact and powerful heating performance.
- Efficient power usage, ideal for solar or battery setups.
- Automatic altitude adjustment up to 10,000 feet.
- Quiet operation with minimal noise from the fuel pump.
- User-friendly control panel with a programmable timer.
- Includes most components needed for installation.
Cons
- High price tag compared to budget options.
- Does not include a fuel tank or standpipe.
- No smart app or remote control features.
- Installation may require advanced skills or professional help.
3. Vevor 8KW Diesel Heater
Quick Facts
- Heating Power: 8kW (27,000 BTU)
- Fuel Consumption: 0.18–0.48 liters/hour
- Power Source: 12V
- Control Options: LCD panel, remote control, and Bluetooth app
- Noise Level: Includes silencer and upgraded fan
- Fuel Tank: Integrated 10-liter tank included
Product Overview
The VEVOR 8KW Diesel Air Heater is a high-output, cost-effective heating solution designed for RVs, trucks, trailers, and boats. Its 8KW (27,000 BTU) heat output makes it perfect for larger spaces or extremely cold conditions. Operating on 12V power, it uses minimal diesel (0.18–0.48 liters per hour), offering excellent efficiency for extended use.
A standout feature of the VEVOR heater is its multiple control options. It includes an LCD control panel, a remote control, and Bluetooth app connectivity, allowing you to adjust settings from up to 98 feet away. These features add convenience, especially on chilly mornings when you’d prefer to stay in bed.
The heater also prioritizes quiet operation with a built-in silencer and upgraded fan, making it suitable for light sleepers or quieter environments. Safety features like an overheat sensor and a highly efficient combustion chamber ensure reliable performance.
The VEVOR heater comes with a complete installation kit, including a 10-liter fuel tank, exhaust pipe, air intake pipe, wiring harness, and mounting hardware. However, proper installation may require mechanical experience or professional help.
Overall, the VEVOR 8KW Diesel Air Heater is a powerful, efficient, and affordable alternative to premium diesel heaters, offering impressive features for its price.
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My Verdict
The VEVOR 8KW Diesel Air Heater is an excellent budget-friendly option for larger spaces or cold climates. Its powerful heat output, Bluetooth control, and quiet operation make it a versatile choice, though installation may require some technical know-how.
Pros
- High heat output, ideal for large spaces or cold climates.
- Efficient fuel consumption for extended use.
- User-friendly controls with LCD panel, remote, and smartphone app.
- Bluetooth app allows control from up to 98 feet away.
- Comes with a complete installation kit, including a fuel tank.
- Built-in safety features like an overheat sensor and stable combustion.
Cons
- Not watertight, limiting use in humid or marine environments.
- Budget parts may not match the durability of premium brands.
- Installation requires mechanical expertise or professional help.
4. Hcalory Diesel Heater
Quick Facts
- Heating Power: 5kW (17,000 BTU)
- Fuel Consumption: Low and efficient
- Power Source: 12V
- Control Options: LCD panel and remote control
- Noise Level: Integrated muffler for quieter operation
- Fuel Tank: 10-liter tank included
Product Overview
The HCALORY 5KW Diesel Air Heater is a compact and economical solution for heating vehicles like RVs, vans, and trailers. With a heat output of 5KW (17,000 BTU), it efficiently warms small to medium-sized spaces, operating on a 12V power supply to minimize energy use.
This heater is equipped with a digital LCD control panel and a remote control, making it easy to adjust settings, fan speeds, and timers from anywhere in your vehicle—perfect for chilly mornings. Its integrated muffler reduces noise, creating a quieter environment compared to many other budget diesel heaters.
The HCALORY features an upgraded fuel pump and combustion chamber, ensuring cleaner, more efficient fuel use, which reduces emissions and operating costs. Safety features like overheating protection, voltage regulation, and an energy-saving mode further enhance its appeal for long-term use.
The package includes a 10-liter fuel tank, exhaust pipe, air intake pipe, wiring harness, and mounting hardware, providing most components needed for installation. While it’s designed for DIY installation, some mechanical knowledge is necessary to set it up correctly.
Overall, the HCALORY 5KW Diesel Air Heater is an affordable, efficient, and user-friendly option, offering reliable warmth and convenience without breaking the bank.
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My Verdict
The HCALORY 5KW Diesel Air Heater is a reliable and affordable option for small to medium-sized spaces, offering efficient heating, quiet operation, and convenient controls. Its comprehensive installation kit and safety features make it a great choice for budget-conscious RV and van owners.
Pros
- Good heat output suitable for small to medium spaces.
- Efficient fuel consumption with upgraded combustion components.
- Quiet operation with an integrated muffler.
- User-friendly LCD panel and remote control.
- Complete installation kit with a 10-liter fuel tank included.
- Basic safety features like overheating protection and voltage regulation.
Cons
- No built-in altitude adjustment for high-elevation use.
- Not watertight, limiting use in humid environments.
- Budget components may not last as long as premium options.
- Installation requires some mechanical experience.
- No smartphone app or Bluetooth connectivity.
5. LF Bros 5KW All-in-One Diesel Heater
Quick Facts
- Heating Power: 5kW (17,000 BTU)
- Power Options: 12V, 24V, and 110V (wall plug adapter included)
- Fuel Tank: Built-in 10-liter tank
- Control Options: LCD panel and remote control
- Noise Level: Low-noise fuel pump and optimized combustion chamber
Product Overview
The LF Bros 5KW Diesel Air Heater is a compact, all-in-one heating unit designed for portability and ease of use. With a heating capacity of 5KW (17,000 BTU), it efficiently warms small to medium-sized spaces, making it ideal for RVs, trailers, and off-road vehicles. The heater operates on a 12V, 24V, or even 110V power supply, offering flexibility for different setups. A wall plug adapter is included, allowing you to use it in a garage or home as well.
This heater comes with an upgraded LCD control panel for adjusting temperature, fan speed, and timers, as well as a remote control for added convenience. Its all-in-one design integrates the fuel tank into a durable metal box, reducing installation complexity compared to traditional diesel heaters.
The LF Bros heater features a low-noise fuel pump and optimized combustion chamber for quiet operation and efficient fuel use. It also incorporates essential safety features, including overheating protection, voltage regulation, and a built-in temperature sensor for reliable performance.
The package includes a complete installation kit with a built-in 10-liter fuel tank, exhaust pipe, air intake pipe, mounting brackets, and wiring harness, making setup straightforward. The portable design allows you to easily move the heater between your RV, garage, or car, offering versatility for various heating needs.
See Also: How To Add A Fuel Filter To A Portable Diesel Heater
My Verdict
The LF Bros 5KW Diesel Air Heater is an excellent all-in-one portable heating solution for small to medium spaces. With its versatile power options, compact design, and built-in fuel tank, it’s perfect for on-the-go heating needs in RVs, trailers, garages, and more.
Pros
- Efficient heat output for small to medium spaces.
- Compact and portable design with an all-in-one metal box.
- Quiet operation with a low-noise fuel pump.
- User-friendly controls with LCD panel and remote.
- Complete installation kit with a built-in 10-liter fuel tank.
- Basic safety features like overheating protection and voltage regulation.
- Easier installation compared to traditional diesel heaters.
- Versatile with 12V, 24V, and 110V power source options.
Cons
- No smartphone app or Bluetooth connectivity.
- No built-in altitude adjustments for high elevations.
- Budget components may not last as long as premium models.
- Not watertight, limiting use in humid environments.
6. Vevor All-In-One Diesel Heater
Quick Facts
- Heating Power: 8kW (27,000 BTU)
- Fuel Consumption: 0.18–0.48 liters/hour
- Power Source: 12V
- Control Options: Bluetooth app, LCD panel, and remote control
- Noise Level: Includes silencer and upgraded fan
- Fuel Tank: Built-in 10-liter tank
Product Overview
The VEVOR 8KW Diesel Air Heater with Bluetooth offers powerful heating for larger spaces, delivering up to 27,000 BTU of warmth. Operating on a 12V power supply, it uses diesel fuel efficiently (0.18–0.48 liters per hour), making it cost-effective for extended use in RVs, trailers, and boats.
What sets this model apart is its Bluetooth compatibility, allowing you to control the heater via a smartphone app. With the app, users can adjust temperature settings, fan speeds, and timers remotely, providing unmatched convenience. The heater also includes a digital LCD control panel and a remote control for manual operation, ensuring flexibility in various situations.
Designed for quiet operation, the heater features a built-in silencer and upgraded fan to reduce noise levels, making it suitable for campers who value peace and quiet. Safety features like an overheat sensor and a clean-burning combustion chamber enhance reliability and efficiency, contributing to both performance and longevity.
The package comes with a comprehensive installation kit, including a 10-liter fuel tank, exhaust pipe, air intake pipe, wiring harness, and mounting brackets, simplifying the setup process. Whether used in an RV, truck, or garage, the VEVOR 8KW Diesel Air Heater combines power, efficiency, and modern features, making it a solid choice for cold-weather heating needs.
Read my full review and testing of a similar Vevor diesel heater here.
My Verdict
The VEVOR 8KW Diesel Air Heater with Bluetooth is a powerful, user-friendly, and versatile solution for heating larger spaces or cold environments. Its efficient fuel consumption, quiet operation, and Bluetooth controls make it an excellent choice for RVers and campers looking for modern convenience and reliable warmth.
Pros
- High heat capacity, ideal for large spaces.
- Smartphone app controls for added convenience.
- Efficient fuel consumption for extended use.
- Quiet operation with silencer and upgraded fan.
- User-friendly LCD panel and remote control.
- Includes a complete installation kit with a 10-liter fuel tank.
- Basic safety features like overheating protection.
- Automatic altitude compensation for high-elevation use.
Cons
- Not watertight, limiting use in humid environments.
- Budget components may lack premium durability.
What To Look For In A Diesel Heater For Vans & Campers
Fuel Type
Diesel heaters run on diesel, but if your vehicle uses gasoline, you can find gasoline heaters, like this one by Webasto (click to view on Amazon).
There is also a gasoline heater made by Eberspacher Espar (click to view on Amazon) if you prefer their heaters.
These options save you from needing a separate fuel tank. Be sure to use the correct fuel—mixing diesel and gasoline can lead to serious damage.
Room For The Exhaust
Most diesel heaters have two air vents on the bottom for fresh air intake and heat output in the front. Ensure you can run the vent lines outside your van or camper.
Insulated venting tubes are often included, but longer ones may be needed depending on placement.
Heat Output
Small vans or truck campers typically only need a 2kW or 5kW heater for standard temperatures. For extreme cold or poorly insulated campers, a more powerful heater may be better.
Insulation and slide-outs significantly impact your heating needs.
Proper Installation
While installation may seem straightforward, it involves running gas lines, exhaust pipes, and vents, which require precision.
DIY is possible with online guides, but if you’re unsure, consider hiring a professional, such as an RV repair shop or heating expert.
Quality Fuel Pump
The fuel pump is often the first component to fail. Regularly inspect it for clicking noises and consistent performance.
Malfunctions can lead to overheating or shutdowns, but safety features should prevent major issues.
Control Panel Settings
Some diesel heaters use simple knobs, while others offer advanced settings like timers and temperature controls.
These features help regulate heat, conserve power, and improve safety, making them ideal for overnight or unsupervised use.
See Also: EcoFlow Delta Max 2000 Tested & Reviewed For RV Camping
My Pick For Best Diesel Heater
Eberspacher Espar Airtronic S2 Diesel Heater
The Eberspacher Espar Airtronic S2 is my top pick for the best overall diesel heater, thanks to its superior build quality, advanced features, and reliable performance.
This heater’s control panel includes all the essential features: a built-in thermometer, adjustable temperature settings, a 7-day programmable timer, and self-diagnostic capabilities for added convenience and safety.
What sets the Espar Airtronic apart is its automatic altitude adjustment, a must-have for travelers who frequent different elevations. Whether you’re at sea level, 9,000 feet, or anywhere in between, this heater adjusts seamlessly without manual intervention, ensuring reliable warmth no matter where your journey takes you.
With durable parts and a thoughtful design, the Espar Airtronic S2 is the ultimate diesel heater for vans, campers, and RVs. It’s perfect for those who prioritize convenience, safety, and consistent performance in every environment.
See Also: Can You Put A Composting Toilet In An RV/Camper/Van?
Frequently Asked Questions About Diesel Heaters
What is a diesel heater, and how does it work?
A diesel heater uses diesel fuel to generate heat by drawing in air, heating it through combustion, and circulating warm air into the space.
It’s efficient, safe, and ideal for vehicles, boats, and small spaces.
Are diesel heaters safe for RVs and vans?
Yes, diesel heaters are safe when installed correctly. They include safety features like overheat protection, flame sensors, and proper ventilation systems to prevent carbon monoxide buildup.
How much fuel does a diesel heater use?
A standard 5kW heater uses around 0.17 gallons of diesel per hour on high, making it an efficient option for heating vans or campers.
Are diesel heaters safe?
Yes, diesel heaters are safe when installed correctly with proper safety measures. High-quality models include features like overheat cutoffs and self-diagnostics to ensure reliable and secure operation. Compared to propane heaters, diesel heaters are often safer as they don’t use high-pressure gas, which can be toxic if leaked.
Regular maintenance is key—inspect all components periodically and service the heater after the manufacturer’s recommended runtime to keep it in safe working condition.
Many people comfortably sleep with their diesel heaters running, but it’s wise to test the system during the day after installation to ensure everything functions correctly.
Is it expensive to run a diesel heater?
No, diesel heaters are relatively inexpensive to operate compared to other heating options. With their low power usage, they’re especially cost-effective for boondockers relying on batteries and solar power.
Their efficient fuel consumption makes them a budget-friendly choice for long-term heating.
What batteries are best for running a 12 volt diesel heater?
Diesel heaters have low power requirements, typically peaking at 140 watts during startup.
A deep cycle RV battery or a lithium battery is ideal for running a diesel heater, providing steady power for extended periods. For boondockers, pairing a diesel heater with a solar panel system ensures consistent battery charging.
Even a standard 12V car battery can power a diesel heater for a decent amount of time, though it may not be as efficient as a deep cycle or lithium option.
Investing in the right battery setup ensures reliable performance and keeps your heater running when you need it most.
Do diesel heaters smell?
You may notice a slight diesel smell at startup, but it should dissipate quickly. Persistent odors may indicate a fuel line issue that needs attention.
Can I use a diesel heater at high altitudes?
Yes, but high-altitude use may require built-in altitude adjustment or a high-altitude kit. Premium heaters like Webasto and Espar adjust automatically for efficient operation.
How noisy are diesel heaters?
Most diesel heaters are quiet, especially high-end models with mufflers and noise-dampening technology. Budget models may have a slight ticking sound from the fuel pump.
Do diesel heaters need maintenance?
Yes, regular maintenance includes cleaning the combustion chamber, replacing fuel filters, and inspecting the exhaust and air intake systems. Running the heater periodically prevents blockages.
Can a diesel heater run off the vehicle’s fuel tank?
Yes, if your vehicle uses diesel. For gasoline vehicles, you’ll need a separate tank. A standpipe or fuel line kit is often required for connection.
How long does a diesel heater run on a full tank?
A 10-liter tank can run approximately 40 hours at a fuel consumption rate of 0.25 liters per hour, depending on the heater settings and usage.
Are diesel heaters more efficient than propane heaters?
Yes, diesel heaters are often more efficient, with lower fuel consumption and less moisture production. Diesel is also cheaper and more accessible in remote areas.
Can I use a diesel heater while driving?
Yes, many diesel heaters are safe for use while driving, provided they’re securely installed with proper exhaust and intake systems.
How hard is it to install a diesel heater?
Installation difficulty varies. Some heaters come with comprehensive kits for easier DIY setup, but professional installation is recommended for safety if you lack experience.
What size diesel heater do I need?
For smaller RVs or vans, a 2KW to 5KW heater is sufficient. Larger RVs or colder climates may require an 8KW heater to ensure consistent warmth.
