Autoterm Air 4D 12V Diesel Air Heater — Heater Only

Meet the Autoterm Air 4D 12V Air Heater, a compact diesel-powered heating solution designed to transform cold cabins into warm, ready‑to‑use spaces in minutes. Built for trucks, campers, motorhomes, fleets, and boats up to 15 meters, this heater delivers dependable warmth without engine idling or excessive fuel costs.

Why it stands out: Only 57 W at high power and 10 W at low power, minimizing draws in vehicle installations.

 12V operation with straightforward ducting integration using the RVD791 kit, adaptable to a wide range of layouts.

What this heater solves for you

Instead of idling the engine to stay warm, you get instant comfort the moment you power up. Whether you’re warming a cab before a driver starts the day, or keeping a crew cabin pleasant during extended stops, the Air 4D delivers fast heat, even distribution, and quiet operation. Its low electrical footprint means you can run it alongside other onboard systems without overtaxing your electrical system. For marine use, it provides reliable interior warmth without running a generator in dock or at anchor.

Ideal for

• Trucks, commercial fleets, and long‑haul drivers who value comfort on rest breaks and cold starts.
• RVs, motorhomes, and camper vans needing rapid, uniform heat without engine idle.
• Boats and other mobile vessels up to 15 meters seeking dependable cabin warmth in extreme cold.

Use cases and practical tips

• Morning warm‑up: preheat the cabin so you step into a cozy space before your daily route begins.
• Overnight stops: set the low 1.0 kW mode for quiet, energy‑efficient warmth while you sleep.
• Large spaces: use the high airflow setting to quickly raise the ambient temperature in living areas or crew quarters.
• Long trips: lean on the low fuel draw to maintain comfort with minimal impact on fuel economy.

Installation and performance highlights

Designed for retrofit into a wide range of vehicle layouts, the Autoterm Air 4D 12V is ideal where space is at a premium. Its compact size and robust construction make it a practical choice for both automotive and marine environments. With a dedicated ducting option via the RVD791 kit, you can create a tailored airflow path that delivers even heat distribution to every corner of the cabin or living area.

Why choose RV & Marine Supplies

With a focus on dependable warmth for mobile living and working spaces, RV & Marine Supplies brings proven expertise to every Autoterm installation. This heater is engineered for demanding environments, backed by our commitment to reliable, low‑maintenance comfort on the road or at sea.

Technical snapshot

• Power output: 4.0 kW max; 1.0 kW low setting
• Air flow: up to 168 m³/h (high); 70 m³/h (low)
• Fuel consumption: as low as 0.51 L/h at max power
• Electrical draw: 57 W (high); 10 W (low)
• Operating temperature: down to -45°C
• Weight: 5.5 kg; Dimensions: 402 × 157 × 188 mm
• Voltage: 12V; Installation kit: RVD791 compatible
• Suitable for: cabins and auxiliary spaces on vessels up to 15 m