The Autoterm Air 4D 4kW Diesel Heater Kit is built for larger campervans, motorhomes, expedition trucks, and boats. If you're running an LWB van, high-top conversion, or a build where the standard 2kW heater just doesn't cut it, this is the one.
With adjustable heat output from 1kW to 4kW and airflow up to 168m³ per hour, it brings a large space up to temperature quickly — then backs off to idle while sipping just 0.12 litres of diesel per hour. In the field, that means warmth through the night without flattening your leisure battery or draining your fuel.
The Air 4D runs a brushless induction motor, so it's quiet, draws very little current (10–57W), and is built to last. It works reliably down to -45°C and has an integrated high-altitude sensor for performance up to 4,200 metres — ready for wherever your build takes you.
This is a complete installation kit. Everything you need for a professional-quality fit is in the box.
Kit includes
- Autoterm Air 4D heater unit (12V or 24V — your choice)
- Controller of your choice (see options below)
- Fuel pump with mounting bracket
- 1m exhaust pipe with silencer
- Fuel standpipe and fuel line
- Power cable with integrated fuse box
- 4m control panel cable (extension options available)
- Fuel pump power cable
- Air intake silencer
- Exhaust heat lagging
- Complete fixing kit with nuts and bolts
Internal installation kit
- Turret mounting plate
- 90mm air vent
- 1m of 90mm ducting
External installation kit
- Stainless steel external heater box
- 2 × 90mm air vents
- 2m of 90mm ducting
Technical specifications
- Voltage: 12V or 24V
- Heating output: 1.0–4.0kW
- Heated airflow: 70–168m³/h
- Power consumption: 10–57W
- Fuel consumption: 0.12–0.51L/h
- Maximum operating altitude: 4,200m
- Heater weight: 2.9kg
- Complete kit weight: Approximately 6.5kg
- Heater dimensions: 402 × 157 × 188mm
- Certifications: ISO 9001:2015, E2 R10, E2 R122
- Warranty: 3-year manufacturer's warranty
Controller options explained
Mini Control Panel — a simple, intuitive dial controller. Set your heat level and go. No menus, no screens. Ideal for builders who want straightforward operation.
Push Controller — compact push-button unit with power, mode, and output control. Clean, minimal, and water-resistant (IP67). Great for tight installs.
Comfort Controller — the full-featured option. Digital display, programmable thermostat, 3 timers, and battery safety monitoring. Wake up to a warm van without lifting a finger.
Controller extension cable
The kit comes with a 4m cable as standard. If your panel mounting point is further away, add a 2.5m or 7m extension.