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

Reliable Diesel Heater for Sprinter Van Comfort

Stay warm faster with efficient, quiet cabin heat built for cold-weather Sprinter travel and overnight comfort. This 12V diesel heater delivers up to 13,600 BTU (4.0 kW) of stepless heat output and works with the EasyStart Pro controller for convenient temperature management.

Benefits & Use Cases

The Espar Airtronic M3 D4L is a strong fit for Mercedes-Benz Sprinter camper conversions, service vans, and other mobile builds that need dependable heat without heavy battery drain. Its compact heater body, stepless heat control, and automatic altitude adjustment make it well suited for off-grid travel, winter camping, and daily-use commercial vans.

• Fast, even cabin heat for cold mornings, overnight stops, and shoulder-season travel
• Stepless heating performance helps maintain comfort with quieter operation
• Automatic altitude adjustment supports travel in higher-elevation environments
• Compact 12V heater body works well in space-conscious Sprinter conversions

Vehicle Compatibility

• Mercedes-Benz Sprinter camper van conversions
• Mercedes-Benz Sprinter cargo and work vans
• Other vans, motorhomes, and service vehicles using 12V diesel heating systems
• Applications that benefit from strong airflow and reliable cabin heat during extended use

Technical Specifications

• Fuel Type: 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, extendable by 1 year
• Dimensions (Heater body only): 376 x 140 x 150 mm (14.8 x 5.5 x 5.9 in)
• Certifications: ECE R122 (heating) & ECE R10 (EMC)

Part numbers:

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

Kit Includes

• Espar AM3 D4L Diesel 12V heater
• EasyStart Pro Controller
• Fuel pump (12v)
• Fuel hose
• Exhaust Silencer / Muffler
• Electrical harnesses - Plug n' Play
• Combustion intake pipe ~3.3 ft (1 m)
• Flexible ducting (90 mm / 3.54 in diameter) - 1.64 ft (0.5 m)
• Inlet grills
• Adjustable air outlet grill (90 mm / 3.54 in diameter)
• Screws, clips and plastic straps required for installation
• Installation manual CD (Scan QR code for installation manual download)
• Warranty documentation
• Specific Mercedes Benz Sprinter Adapter for aux tap
• Pro controller extension 9.8 ft (3m)
• Floor mounting plate with gasket
• Stainless steel exhaust system - approx. 6.6 ft (2m)

Browse Eberspächer/Espar Manuals & Technical Documentation

FAQs

Is this a good diesel heater for a Sprinter van?
Yes. This kit is built around the Airtronic M3 D4L 12V platform and suits Sprinter camper and work-van builds that need dependable cabin heat with efficient fuel use.

Can I control the heater easily from inside the van?
Yes. The EasyStart Pro controller gives you convenient control over heating functions, making it easier to manage comfort during daily use and overnight stays

How does this heater perform at altitude?
The Airtronic 3 platform supports automatic altitude adjustment, which helps maintain more reliable operation during mountain travel and higher-elevation camping.

Is this kit suitable for long duct runs in a van build?
Yes. The M3 D4L platform is designed for strong heat output, and careful duct routing helps improve airflow, efficiency, and long-term reliability.

Can a DIY installer fit this heater kit?
Many van builders install diesel heaters themselves, especially when using a vehicle-specific kit. Proper fuel routing, exhaust placement, and electrical connections are essential.