Espar Airtronic M3 D4L Diesel 24V Heater Kit with EasyStart Pro Controller

Reliable Espar D4L heating for 24V diesel vehicles

Stay comfortable in cold weather with dependable Espar D4L heating for trucks, vans, RVs, work vehicles, and off-grid builds. This 24V diesel air heater kit delivers up to 13,650 BTU (4.0 kW) of heat with EasyStart Pro control, efficient fuel use, and high-altitude operation up to 18,000 ft (5,500 m).

Benefits & Use Cases

Built for steady cabin heat, the Airtronic M3 D4L is a strong choice for overnight truck use, van conversions, camper travel, mobile workshops, and winter job sites. Its 4.0 kW output helps warm larger cabins while keeping electrical demand low for battery-conscious 24V systems.

The included EasyStart Pro controller gives drivers and travelers simple temperature management, making this diesel air heater kit practical for cold starts, sleeping comfort, and off-grid heating in demanding conditions.

• Comfortable overnight heat for truck sleepers, lorries, and fleet vehicles
• Strong airflow for vans, buses, campers, caravans, and mobile workshops
• Efficient diesel operation for long winter trips and remote work locations
• High-altitude capability for mountain routes, overland travel, and cold-weather camping

Technical

• Fuel Type: Diesel
• Voltage: 24V
• Max Heat 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 only): 14.6 × 5.5 × 5.9 in (371 × 140 × 150 mm)
• Heater Part Numbers: Heater 25.2729.05.0000 / 25.2729.05.00.00 / 252729050000
• Installation Kit Part Numbers: 252720800000 / 25.2720.80.0000 / 25.2720.80.00.00 / 25 2720 80 0000
• Certifications: ECE R122 (heating) and ECE R10 (EMC)

Browse Eberspächer/Espar Manuals & Technical Documentation

Compatibility

• Truck / Lorry /
• Van / Bus
• Van Conversion
• Camper / Camper-van / Caravan
• Construction Machinery / Agricultural vehicles
• Military / Army/ Defense / Emergency vehicles
• Horse Box
• Mobile Workshop
• Boat (requires marine kit)

Kit Includes

• Eberspacher Airtronic AM3 D4L 24v Heater
• EasyStart Pro controller
• Fuel pump (24v)
• 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

FAQs

Is the Espar D4L suitable for truck sleeper heating?
Yes. The Espar D4L is well suited for truck and lorry sleeper cabs, especially when you need dependable overnight warmth without idling the engine.

Can this 24V diesel air heater be used in a van conversion?
Yes. This kit works well for larger van conversions, campers, caravans, and RV layouts where 24V power is available and 4.0 kW heat output is appropriate.

How does the Espar Airtronic M3 D4L perform at altitude?
This heater supports operation up to 18,000 ft (5,500 m), making it suitable for mountain routes, winter camping, and high-elevation travel.

What does the EasyStart Pro controller do?
EasyStart Pro gives you simple heater control from the cabin, helping manage temperature, runtime, and comfort during overnight stays or cold-weather work.

Can I install this heater in a boat?
The heater can be used for boat cabin heating, but marine installation requires the correct marine kit and proper routing for combustion air, exhaust, fuel, and ventilation.