Espar Airtronic M3 D4L Diesel 12V Heater Kit with EasyStart Pro Controller

Fast, Quiet Diesel Air Heat for Vans, RVs, Trucks & Small Boats

Warm up large cabins quickly and sleep comfortably with low battery draw and steady airflow. The Airtronic M3 D4L delivers up to 13,650 BTU (4 kW) and pairs with the EasyStart Pro for simple, reliable control in all seasons.

Benefits & Use Cases

This latest-generation Eberspächer/Espar Airtronic is designed for bigger spaces—cargo vans, motorhomes, sleeper cabs, and yachts up to ~35 ft—where you need real heat without idling the engine.

• Heats fast, then maintains an even, quiet temperature through the night
• Low electrical draw (5–42 W) to protect house batteries off-grid
• Automatic altitude capability up to 18,000 ft (5,500 m) for mountain travel
• Compact body fits under seats or in service bays on vans, RVs, and trucks

Technical Specifications

• Fuel: Diesel
• Voltage: 12V
• Max Output: 13,650 BTU (4.0 kW)
• Fuel Consumption: 0.03–0.135 gal/h (0.11–0.51 l/h)
• Power Consumption: 5–42 W; starting ≤100 W
• Max Altitude: 18,000 ft (5,500 m)
• Warranty: 2 years
• Dimensions (heater body): 14.6 × 5.5 × 5.9 in (371 × 140 × 150 mm
• Certifications: ECE R122 (heating) & ECE R10 (EMC)

Part numbers:

• Complete kit: 202829550402 
• Heater only: 252955050000
• Alternative formats: 20.2829.55.0402; 20.2829.55.04.02; 20 2829 55 0402 ; 20 2829 55 04 02

Browse Eberspächer/Espar Manuals & Technical Documentation

Vehicle Compatibility

• Large trucks – cabs with sleeping cabins
• Vans and small buses
• Large agricultural and construction machines
• Yachts up to ~35 ft (requires marine intallation kit)
• Motorhomes, minivans, and mobile office/conference vehicles

Kit Includes

• Eberspacher Airtronic AM3 D4L 12v Heater
• EasyStart Pro controller
• Fuel pump (12v)
• Fuel hose
• Exhaust Silencer / muffler
• Electrical harnesses
• Stainless steel exhaust pipe - approx. 90cm
• Combustion intake pipe
• Flexible ducting - 0.5 meter
• Inlet / Outlet grills
• Air outlet (90mm)
• Screws, clips and plastic straps required for installation
• Installation manual
• Warranty documentation