Espar AM3-B4R - Petrol

⚠️ Special Order item — please contact us for lead time before ordering.

The Espar Airtronic AM3-B4R is Eberspaecher's high-throughput Generation 3 petrol air heater — engineered for applications with complex ducting arrangements that demand more airflow than the standard B4L.

The B4R is specifically recommended when your ducting system requires higher air throughput. With a 5,000-hour brushless motor and built-in altitude compensation up to 18,000 ft, it delivers the same Generation 3 performance as the B4L in a right-hand outlet configuration.

⚠️ Not sure if the B4R is right for your system? The AM3-B4L is the standard choice for most installs. The B4R is only recommended when complex ducting is in place. Call us at 800.837.3900 before ordering and we'll confirm the right fit.

⚠️ EasyStart Pro Controller and Muffler Kit are not included. Add EasyStart Pro (PN 22.1000.70.2200) and Muffler Kit 24mm (PN 22.1000.40.0900K) separately, or call 800.837.3900 for help.

Why the AM3-B4R?

• Higher air throughput than the B4L — recommended only for complex ducting systems that require greater airflow
• 4 kW output — powerful enough to heat a full-size cargo van or camper in sub-zero temps
• Brushless motor — extended 5,000-hour service life and noticeably quieter operation than previous generations
• Built-in altitude adjustment — works up to 5,500m / 18,000 ft with no additional module required
• Improved fuel metering pump acoustics — runs cleaner and quieter than the outgoing model
• Runs on gasoline/petrol — draws directly from your vehicle's existing fuel tank
• 2-year / 2,000-hour warranty — backed by Eberspaecher's manufacturer warranty

Specs

• Fuel Type: Gasoline / Petrol
• Voltage: 12V
• Max Heat Output: 4 kW
• Altitude Rating: Up to 5,500m / 18,000 ft (built-in)
• Warranty: 2 years / 2,000 hours
• Part Number: 20.2820.31.0400

What's Included

• Eberspaecher Airtronic AM3-B4R 12V Heater
• Fuel Metering Pump
• Fuel Line & Clamps
• Wire Harnesses
• Stainless Steel Exhaust Pipe
• Combustion Intake Pipe
• Flexible Ducting — 0.5 meter
• Outlet Grill
• Air Outlet Hood (90mm straight)
• Mounting Plate with Seals and Screws
• Screws, Clips, and Plastic Straps
• Installation Manual
• Warranty Documentation

Not included: EasyStart Pro Controller (PN 22.1000.70.2200) and Muffler Kit 24mm (PN 22.1000.40.0900K).

Ideal For

• Applications with complex ducting requiring higher airflow than the B4L
• Cargo vans, trucks, and camper conversions
• Mobile workshops and tool trucks
• Commercial fleet vehicles

Questions about fitment, lead time, or installation? We're here to help — reach out before you order and we'll make sure you get the right kit for your build.