If you want a simpler diesel heater setup without the hassle of separate tanks and complex installation, the Thermomate 12V 5kW All-in-One Diesel Air Heater is designed to make things easier. This version combines the heater and fuel tank into a single compact unit, making it a more straightforward option for caravans, camper trailers, vans, and motorhomes.
Thermomate 12V 5kW All-in-One Diesel Air Heater.
Running on diesel fuel and a 12V system, this heater is ideal for off-grid use. It provides strong heating performance while avoiding the need for mains power, making it a practical choice for travel, camping, and mobile living setups.
The biggest advantage of this model is its all-in-one design. The heater and fuel tank are housed together in a single unit, which simplifies installation and makes it easier to move or remove if needed. This is especially useful for people who don’t want to permanently install a heater in their vehicle.
Like other Thermomate models, it uses a high-efficiency aluminium heatsink to deliver fast heat and maintain consistent temperature control. Once it reaches your set temperature, it operates quietly, making it suitable for overnight use. :contentReference[oaicite:1]{index=1}
It also includes automatic temperature regulation and remote control operation, so you can adjust settings without getting up—ideal for cold mornings or overnight heating.
Main features
All-in-one design with built-in fuel tank
Powerful 5kW heating output
12V operation for off-grid use
Diesel-powered for efficient running costs
LCD control panel and remote control
Automatic temperature control
Fast heat-up with aluminium heatsink
Quiet operation once at temperature
Auto cool-down cycle for safety
Compact and portable form factor
Key specifications
Specification
Details
Brand
Thermomate
Power
5kW
Voltage
12V
Fuel type
Diesel
Fuel tank
Integrated (approx. 5–10L depending on model)
Fuel consumption
0.21–0.51 L/hour
Noise level
Approx. 70–90 dB
Operating temperature
-40°C to +20°C
Control
LCD panel + remote
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Who it suits
This heater is ideal for:
Caravan and camper trailer owners
Van life and motorhome setups
Off-grid travellers
People wanting a simpler installation setup
It is especially useful for those who want a heater that can be installed quickly or moved between setups.
Important points before you buy
While easier to install than split systems, this is still not completely plug-and-play. You will still need to:
Install exhaust and air intake correctly
Connect to a 12V power source
The all-in-one design makes setup easier, but proper installation is still important for safe operation.
Also note that 5kW may be too powerful for very small vans, and running it constantly on low output can lead to carbon build-up over time.
What is in the box
All-in-one diesel heater unit (heater + tank)
LCD control panel
Remote control
Ducting and vents
Exhaust pipe and muffler
Mounting hardware
User manual
Final thoughts
The Thermomate 12V 5kW All-in-One Diesel Heater is a great option for simplicity and flexibility. It delivers the same strong heating performance as standard diesel heaters but removes some of the complexity around installation.
If you want an easier setup and the ability to move or reposition your heater, this model is one of the most practical choices available in this price range.
Frequently Asked Questions
What does “all-in-one” mean?
It means the heater and fuel tank are built into a single unit, making installation simpler and more compact.
Does it require mains power?
No. It runs on diesel fuel and a 12V power system.
Is it easier to install than standard diesel heaters?
Yes. The integrated design reduces installation complexity, although proper setup is still required.
How long can it run?
Up to around 18 hours depending on tank size and heat settings. :contentReference[oaicite:3]{index=3}
Is it suitable for very small vans?
It may be too powerful. A smaller 2kW unit may be a better fit for compact spaces.
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