Espar Airtronic M3 B4L Gasoline 12V Ram Promaster Kit with EasyStart Pro Controller

Powerful Gasoline Heater for Ram ProMaster Comfort

Stay warm and comfortable during cold-weather trips, overnight stops, and year-round van adventures. The Espar Airtronic M3 B4L Gasoline 12V heater delivers up to 13,600 BTU (4.0 kW) of stepless heat output, providing efficient and reliable cabin heating for gasoline-powered Ram ProMaster vans. Paired with the EasyStart Pro controller, it offers convenient temperature management for camper conversions, work vans, and off-grid travel.

Benefits & Use Cases

The Espar Airtronic M3 B4L is an excellent heating solution for Ram ProMaster camper van conversions, mobile workshops, and commercial vehicles that require dependable cabin warmth. Its compact design, quiet operation, and automatic altitude adjustment make it well suited for winter camping, mountain travel, and extended overnight stays. The gasoline-powered configuration allows ProMaster owners to use the same fuel type as their vehicle without requiring a separate diesel fuel supply.

• Fast, consistent cabin heating for cold mornings, overnight camping, and winter travel
• Stepless heat output maintains comfortable temperatures with quieter operation
• Automatic altitude adjustment supports reliable heating performance at higher elevations
• Compact 12V heater design offers flexible installation in space-conscious ProMaster conversions
• Gasoline operation is ideal for petrol-powered Ram ProMaster vans
• Efficient fuel and electrical consumption supports extended off-grid adventures

Vehicle Compatibility

• Gasoline-powered Ram ProMaster camper van conversions
• Ram ProMaster cargo vans and mobile service vehicles
• Ram ProMaster 1500, 2500, and 3500 gasoline models, subject to installation compatibility
• Other gasoline-powered vans and mobile applications using compatible 12V air heating systems
• Camper builds requiring powerful cabin heating and flexible warm-air distribution

Designed for gasoline-powered vehicles with 12V electrical systems. Not suitable for diesel applications or marine use. Verify fuel connection and mounting compatibility before installation.

Technical Specifications

• Fuel Type: Gasoline
• Voltage: 12V
• Max Heat Output: 13,600 BTU (4.0 kW)
• Heat Output Range: 4,400–13,600 BTU (1.3–4.0 kW)
• Fuel Consumption: 0.04–0.15 gal/h (0.17–0.55 L/h)
• Power Consumption: 4–38 W
• Max Altitude: 18,000 ft (5,500 m) with integrated altitude sensor
• 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: 202820300402 + Ram ProMaster kit accessories
• Heater only: 202030050000
• Alternative formats: 20.2820.30.0402; 20.2820.30.04.02; 20 2820 30 0402; 20 2820 30 04 02

Kit Includes

• Espar Airtronic M3 B4L Gasoline heater unit (12V)
• EasyStart Pro controller
• Fuel pump (12V)
• Fuel hose
• Exhaust silencer / muffler
• Electrical harnesses - Plug n' Play
• Combustion intake pipe - approx. 3.3 ft (1 m)
• Flexible ducting (90 mm / 3.54 in diameter) - 1.64 ft (0.5 m)
• Inlet / outlet grills
• Adjustable air outlet grill (90 mm / 3.54 in diameter)
• Screws, clips, and plastic straps required for installation
• Installation manual access (scan QR code for download)
• Warranty documentation

Additional Ram ProMaster kit accessories:

• Vehicle-specific fuel connection hardware
• Floor mounting plate with gasket
• EasyStart Pro controller extension - 9.8 ft (3 m)
• Stainless steel exhaust pipe - approx. 6.6 ft (2 m)

Browse Eberspächer/Espar Manuals & Technical Documentation

FAQs

Is the Espar M3 B4L a good heater for a Ram ProMaster van?
Yes. The Airtronic M3 B4L is a powerful 12V gasoline air heater suitable for Ram ProMaster camper conversions, cargo vans, and mobile workspaces. Its 4.0 kW maximum heat output makes it a strong option for maintaining comfortable cabin temperatures during cold-weather travel.

Can the heater use gasoline from my Ram ProMaster's fuel tank?
Yes. The M3 B4L runs on gasoline and can be connected to a compatible vehicle fuel supply using properly installed fuel connection components. The specific connection method depends on the vehicle model and fuel system configuration.

Does the M3 B4L work at high altitudes?
Yes. The Airtronic 3 platform features automatic altitude adjustment and supports operation at elevations up to 18,000 ft (5,500 m), making it suitable for mountain trips and high-elevation camping.

How much gasoline does the heater consume?
The Espar M3 B4L consumes approximately 0.04–0.15 gallons of gasoline per hour (0.17–0.55 L/h), depending on the selected heating output and operating conditions.

Can I control the heater from inside my ProMaster?
Yes. The EasyStart Pro controller allows convenient heating adjustments from inside the van, helping maintain comfortable temperatures during daily driving, overnight parking, and extended camping trips.

Can I install this heater in a DIY camper conversion?
Yes. The kit is suitable for experienced DIY van builders and professional installers. Correct fuel connections, electrical wiring, exhaust routing, combustion air intake, and warm-air ducting are essential for safe and reliable operation. Always follow the manufacturer's installation instructions.