Espar AS3 D2L 12V Heater- Full Kit (Diesel)

The Espar AS3 D2L 12V Heater- Full Kit (Diesel) 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 ~ 13,000 ft. in elevation with the included altitude sensor.

Not all Espar kits are built the same. These units are genuine Eberspächer heaters with high-quality wiring harnesses from Eberspächer.

Package contents:

- Espar AS3 D2L 12V Heater (Diesel)
- INSTALL KIT - AIR S3 D2L 12V (Includes fuel standpipe)
- CONTROL KIT - EASY START PRO CONTROLLER WITH ADAPTOR
- EXHAUST MUFFLER 24MM
- 26-28mm MUFFLER CLAMP (2x)
- EXHAUST BRACKET

This kit comes with a fuel stand pipe, not the T-Piece kit (The Sprinter Aux port uses a Dorman connector and must be purchased separately). Please see image and Installation Manual below for more details. 

Documents: Espar AS3 D2L 12V Heater- Full Kit (Diesel)

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 D2L 12V Heater- Full Kit (Diesel)

Video: Espar AS3 D2L 12V Heater- Full Kit (Diesel)

FAQs

What is the best 12 volt heater for a camper?

The Espar AS3 D2L 12V Diesel Heater is one of the best options for campers. It delivers 7500 BTU of heat output while consuming only 4-27W of power and 0.04-0.07 gallons of fuel per hour. This genuine Eberspächer heater runs directly from your vehicle's diesel tank, making it efficient and reliable for extended off-grid camping.

What is the best space heater for a camper van?

The Espar D2L diesel heater is a top choice for camper vans because it provides consistent dry heat without producing moisture inside your van. Unlike propane heaters, it draws fuel from your main tank and requires no separate fuel storage. The compact design measures just 12.2" x 4.8" x 4.52" and weighs only 5.5 lbs, making it ideal for van conversions with limited space.

How do you heat a Sprinter van conversion?

The most popular method to heat a Sprinter van conversion is installing a diesel heater like the Espar AS3 D2L. This system taps into your Sprinter's existing diesel fuel tank and uses a small amount of fuel to generate warm air. The included Easy Start Pro Controller allows you to set temperatures and timers. Installation requires mounting the heater unit, connecting the fuel line with the included standpipe, and routing the exhaust safely outside the van.

What heater works at high altitude?

The Espar AS3 D2L 12V Heater works effectively at high altitudes up to 13,120 feet (4000m) thanks to the included altitude sensor. This sensor automatically adjusts the air-to-fuel ratio as elevation changes, ensuring consistent performance whether you're camping at sea level or in mountain locations. This makes it ideal for overland adventures in places like Colorado, the Sierra Nevada, or other high-elevation destinations.

How much fuel does an Espar diesel heater use?

The Espar AS3 D2L diesel heater uses between 0.04 and 0.07 gallons per hour (0.14-0.26 liters per hour) depending on the heat setting. At the lowest setting, running the heater for 10 hours would consume less than half a gallon of diesel. This fuel-efficient operation means you can stay warm for days without significantly impacting your driving range or needing to refuel frequently.