If you want reliable heat while travelling or camping without relying on mains power, the Thermomate 12V 5kW Diesel Air Heater is a practical solution designed for caravans, camper trailers, vans, and motorhomes. Running on diesel and powered by a 12V system, this heater is built for off-grid use and delivers strong heating performance in compact spaces.
Caravan Thermomate 12V 5kW Diesel Air Heater.
This model is based on a proven German-style design and uses a high-efficiency aluminium heatsink to deliver fast, consistent warmth. It is designed to heat enclosed spaces quickly, reduce condensation, and keep your setup comfortable even in colder climates. :contentReference[oaicite:1]{index=1}
This Thermomate diesel heater is designed to provide a self-contained heating solution for mobile environments. Unlike electric heaters, it does not require 240V power, and unlike LPG heaters, it offers lower running costs and efficient fuel consumption.
The heater produces warm air through a ducted system, allowing it to heat your space evenly. It also features automatic temperature control, meaning it adjusts output based on your set temperature for consistent comfort. :contentReference[oaicite:2]{index=2}
Another key advantage is that it includes everything needed for installation, making it a complete kit rather than just a heater unit.
Main features
Powerful 5kW heating output
12V operation for off-grid use
Efficient diesel fuel system
LCD control panel and remote control operation
Automatic temperature regulation
Low noise operation once running
Fast heat-up with aluminium heatsink design
Compact size for flexible installation
Auto cool-down cycle for safety
All mounting hardware included
Key specifications
Specification
Details
Brand
Thermomate
Model
TH-RVH5
Power
5kW
Voltage
12V
Fuel type
Diesel
Fuel tank
10L (up to approx. 36 hours runtime)
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
Weight
Approx. 7kg
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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
Cold-weather camping
It works especially well in enclosed spaces where consistent heating is needed overnight.
Important points before you buy
This is not a plug-and-play heater. Installation is required, including:
Fuel line setup
Exhaust routing
Electrical connection to a 12V system
Proper installation is important for safety and performance. The heater also requires space for ducting and airflow, so planning your layout is key.
Because this is a 5kW unit, it may be oversized for very small vans. Running it continuously on low output can lead to carbon build-up over time.
What is in the box
Thermomate diesel air heater unit
LCD control panel
Remote control
Wiring loom
Air ducting and vents
Exhaust pipe and muffler
Fuel pump and mounting kit
Fuel lines and connectors
Mounting hardware
User manual
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Final thoughts
The Thermomate 12V 5kW Diesel Heater is a high-value, off-grid heating solution that delivers strong performance for caravans and mobile setups. It heats quickly, runs efficiently, and includes everything needed for installation.
While it requires setup and is not as refined as premium brands, it offers excellent value for anyone wanting reliable, cost-effective heating on the road.
Frequently Asked Questions
Does this heater require mains power?
No. It runs on diesel fuel and a 12V power supply.
How long can it run on a full tank?
Up to approximately 36 hours depending on heat settings. :contentReference[oaicite:5]{index=5}
Is it noisy?
It can be louder during startup, but becomes quieter once it reaches operating temperature.
Can I install it myself?
Yes, if you are confident with mechanical and electrical work, as it comes as a complete kit.
Is it suitable for very small vans?
It may be too powerful for very small spaces. A smaller unit could be more suitable in those cases.
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