The Eberspächer Airtronic D4L (24V) is a high-performance diesel air heater engineered for large campervans, motorhomes, expedition trucks, commercial service vehicles, marine cabins, and off-grid installations. With its strong heating capacity and durable construction, the D4L provides reliable and consistent warmth even in harsh winter conditions, making it an ideal heating solution for demanding environments.
The included Comfort Installation Kit provides all essential components for a complete and professional installation—fuel system parts, exhaust components, wiring harnesses, air ducts, and mounting hardware—ensuring a smooth, safe, and reliable setup.
Key Features
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Heating Capacity: Approx. 1.8 – 4.0 kW — ideal for medium to large interior spaces
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24V System Compatibility: Perfect for trucks, buses, heavy-duty equipment, and 24V RV setups
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Diesel-powered heating with optimized combustion for excellent fuel efficiency and low emissions
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Quiet and stable operation thanks to advanced airflow engineering and noise-reduction design
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Rugged, vibration-resistant, and moisture-protected construction — perfect for off-road and industrial use
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Precise temperature regulation with built-in thermostat and adjustable airflow
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Automatic altitude compensation ensures reliable performance in high mountain regions
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Ideal for demanding applications such as expedition trucks, large camper builds, and commercial service vehicles
Airtronic M2 D4L 24V Heater – Package Contents
1 × Airtronic M2 D4L Heater Unit
OEM Code: 252729
1 × Digital Control Switch
OEM Code: 25.1000.35.2200.0C
1 × 90 mm Hot Air Hose (50 cm)
OEM Code: Not specified
1 × Heater Front Cover
OEM Code: Not specified
1 × Electrical Wiring Harness
OEM Code: 25.2720.80.1100.0A
1 × Fuel Hose (8 meters)
OEM Code: Not specified
1 × Air Intake Pipe (100 cm)
OEM Code: Not specified
2 × Exhaust Pipes (90 cm + 30 cm)
OEM Code: Not specified
1 × Silencer
OEM Code: Not specified
1 × Air Outlet Vent
OEM Code: 22.1000.01.0056.0A
1 × Fuse Kit
OEM Code: 22.9000.30.2720.0A
1 × Automatic Holder / Bracket
OEM Code: 22.1000.50.0300.0D
15 × Plastic Clamps
OEM Code: 22.9000.09.0165.0A
1 × Automatic Mounting Components
OEM Code: 22.9000.09.0163.0A
1 × Installation Hardware (screws & clamps)
OEM Code: Not specified
1 × Air Intake Grill
OEM Code: Not specified
1 × 90 mm Hose Clamp
OEM Code: Not specified
1 × 1–4 kW Fuel Metering Pump
OEM Code: 22.4553.01
Installation Box
OEM Code: 25.2720.80.0000.0B
Typical Applications
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Motorhomes and large campervans
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Expedition and overland trucks
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Commercial service vehicles and mobile workshops
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Marine cabins and sailing yachts
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Off-grid installations, tiny homes, and mobile shelters
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Heavy-duty and industrial 24V vehicle platforms
