Espar AS3 B2L 12V Heater- Full Kit (Gasoline)
The Espar AS3 B2L 12V Heater- Full Kit (Gasoline) is the classic way to heat the interior of your van using fuel from your main diesel tank. This kit includes everything you need to install the Espar in your Sprinter van and will operate effectively up to ~ 13,120 ft. in elevation with the included altitude sensor.
Not all Espar kits are built the same. These units are genuine Eberspacher heaters with high-quality wiring harnesses from Eberspacher.
Key Features: Espar AS3 B2L 12V Heater- Full Kit (Gasoline)
- Fits universally where space allows
- Espar Full Kits are designed for 2007+ Mercedes Sprinters, 2014+ Ram ProMaster, and 2015+ Ford Transit vans(read more below)
- Efficient cabin heating on gasoline builds — no diesel tank required
- Low electrical draw (6–26 W) protects your house batteries off-grid
- Automatic altitude capability up to 13,120 ft (4,000 m) for mountain trips
- Compact body for flexible placement in van conversions and campers
Package contents:
- Espar AS3 B2L 12V Heater (Gasoline)
- INSTALL KIT - AIRTRONIC S3 B2L 12V
- CONTROL KIT - EASY START PRO CONTROLLER WITH ADAPTOR
- EXHAUST MUFFLER 24MM
- 26-28mm MUFFLER CLAMP (2x)
- FUEL LINE ADAPTER 7.5MM - 3.5MM
- GAS FUEL PICKUP(standpipe)
Mercedes Sprinter vans: This kit comes with a fuel stand pipe(fuel pickup), not the T-Piece kit that is commonly known to be used. The hoses included in this kit are designed to attach to the factory auxiliary port(with clamps) or you can source the Dorman Auxiliary Fuel connector adapter(Part# 800-188) separately if convenient to your install.
Ram ProMaster vans have an Auxiliary Fuel Port under the cab floor entry. The hoses included in this kit are designed to attach to the factory port(with clamps) or you can source the Auxiliary Fuel connector adapter separately if convenient to your install.
Ford Transit vans will require dropping the fuel tank on the vehicle, adding an additional fuel pickup pipe and components. Transit Kit variant coming soon!
Muffler Installation: The included muffler does not display which direction air flows. Espar confirmed it can be mounted in either direction, just be sure to follow installation guidelines for proper undercarriage mounting.
Recommended to add insulation wrap to exterior fuel lines/connections to prevent cracking.
Documents: Espar AS3 B2L 12V Heater- Full Kit (Gasoline)
Espar Camper Van Fuel Installation Guide
Espar AS3 B2L/D2L Install Instructions
Espar AS3 B2L/D2L Operating Instructions (English, pg 30)
Espar AS3 B2L/D2L Technical Sheet
Espar AS3 B2L/D2L Troubleshooting Guide
Espar AS3 B2L/D2L Spare Parts List
Espar AS3 B2L/D2L Repair Instructions
Easy Start Pro Controller Documents
Espar Easy Start Pro Controller Guide
Espar Easy Start Pro Controller Guide Additional Info
Espar Easy Start Pro - Additional Product Info
Espar Easy Start Pro Wiring Diagram
Specifications: Espar AS3 B2L 12V Heater- Full Kit (Gasoline)
|
Heater Dimensions (HxWxD) |
121.92mm (4.8 in.)H x 309.88mm (12.2".)L x 114.808mm (4.52 in.)W |
|
Weight |
5.5 lbs (2.5 kg) |
|
Heat Output |
6824 BTU (2.0 kW) |
|
Operating Voltage |
12VDC |
|
Rated Power Consumption |
11-26W |
|
Fuel Consumption |
0.04 - 0.07 gal/h (0.14 - 0.26 l/h) |
|
Fuel Type |
Gasoline |
|
Altitude Compensation |
13,120ft (4000m) |
|
Start Up Requirement |
Glow plugs require ~30A at startup for the first minute or two. |
Video: Espar Airtronic AS3-B2L Air Heater with Standard Install Kit (Gasoline)
Vehicle fitment
- Product type
- Air heater
- Vehicle
- Universal camper vans, RVs, trailers, and overland builds
- Summary
- Universal air heater application. Confirm fuel type, mounting location, duct routing, exhaust routing, 12V power, and clearance before checkout.
Fitment FAQ
What does this Espar air heater fit?
This Espar air heater fits camper vans, RVs, trailers, and overland builds with compatible fuel, mounting, exhaust, intake, ducting, and electrical routing.
Is this product vehicle-specific?
This is a universal application product, not a van-generation-specific product. Fit depends on measurements, installation requirements, and build layout.
What should I verify before ordering?
Confirm fuel type, mounting location, duct routing, exhaust routing, 12V power, and clearance before checkout.
What installation details matter?
Confirm fuel type, heater output, mounting location, combustion air intake, exhaust routing, ducting, wiring, and clearance before ordering.
Who is this product best for?
This air heater is intended for cabin heating in camper vans, RVs, trailers, and overland builds.
Campervan HQ fitment guide
Espar AS3 B2L 12V Heater- Full Kit (Gasoline) for camper van and RV builds
Espar AS3 B2L 12V Heater- Full Kit (Gasoline) supports Universal camper vans, RVs, trailers, and overland builds applications where fitment, measurements, installation requirements, and build layout should be confirmed before ordering.
Why choose this product?
- Supports camper van, RV, and mobile build planning
- Helps confirm measurements, installation needs, and clearances before checkout
- Useful for matching the product to the build layout before ordering
Installation context
- Confirm measurements and clearances
- Review wiring, mounting, sealant, or material requirements where relevant
- Use professional installation when the build requires it
Compatibility notes
Universal air heater application. Confirm fuel type, mounting location, duct routing, exhaust routing, 12V power, and clearance before checkout.
Common use cases
- Camper van conversions
- RV upgrades
- Trailer and overland builds
Espar AS3 B2L 12V Heater- Full Kit (Gasoline)
