If you are travelling off-grid and need reliable heating without relying on mains power, the Thermomate 12V 5kW Diesel Air Heater is built exactly for that purpose. Designed for caravans, camper trailers, vans, motorhomes and even boats, this unit runs on diesel fuel and a 12V power supply, making it a practical heating solution wherever you go.
Thermomate 12V 5kW Diesel Air Heater (Red) Review.
This heater uses a high-efficiency aluminium heatsink design combined with automatic temperature control to deliver consistent and fast heat. It is based on a proven European-style system and is designed to warm enclosed spaces quickly while maintaining fuel efficiency. :contentReference[oaicite:1]{index=1}
The Thermomate diesel heater is designed as a self-contained heating system for mobile environments. Unlike electric heaters, it does not require 240V power, and unlike LPG heaters, it offers efficient fuel consumption and long run times.
With a 5kW output, it is capable of heating most caravan and van interiors quickly. The heater distributes warm air through ducting, ensuring the entire space becomes comfortable rather than just heating one area.
Another key benefit is convenience. The system includes an LCD control panel and remote control, allowing you to adjust temperature, set timers, and control the heater without leaving your bed or seat. :contentReference[oaicite:2]{index=2}
Main features
Powerful 5kW heating output
12V operation for off-grid use
Diesel fuel system with high efficiency
LCD control panel and remote control
Automatic temperature control
Fast heat-up with aluminium heatsink
Quiet operation once running
Auto cool-down cycle for safety
Compact design for flexible installation
Complete installation kit 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
Remote range
Up to 30m
Weight
Approx. 7kg
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Who it suits
This heater is ideal for:
Caravan and camper trailer owners
Van life setups and motorhomes
Off-grid travellers
Cold-weather camping
It is especially useful for overnight heating, keeping your space warm without running your vehicle engine.
Important points before you buy
This is not a plug-and-play product. Installation is required, including:
Fuel line installation
Exhaust routing
12V electrical connection
Proper installation is critical for safe operation. The heater also requires adequate airflow and ducting space.
Because this is a 5kW unit, it may be oversized for very small vans. Running it continuously at 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
Ducting and vents
Inlet air pipe
Exhaust pipe and muffler
Fuel pump and mounting kit
Fuel hose 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 comes as a complete kit.
While installation is required, once set up it provides reliable, low-cost heating that is hard to beat for travel and camping use.
Frequently Asked Questions
Does this heater need mains power?
No. It runs on diesel and a 12V battery system.
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 is louder during startup but becomes quieter once it reaches operating temperature.
Can I install it myself?
Yes, if you are comfortable with mechanical and electrical installation.
Is it suitable for small vans?
It may be too powerful for very small spaces. A lower output heater could be more suitable.
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