Eberspacher / Espar D4L 24V (4KW) Airtronic Heater Kit

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Brand new Eberspacher / Espar Airtronic M2 D4L 24v Air Heater Kit , upgraded Airtronic D4 Plus / D4S 

The cutting-edge M2 Espar D4L sports an upgraded burning chamber, fuel pump, a brushless blower fan, and an integrated altitude sensor for those higher climbs. These upgrades make the Espar D4L significantly more durable with a 5000 hour lifespan. The heater is noticeably quieter, more fuel-efficient, and can operate at altitudes up 9,800 feet.

This kit doesn't include the EasyStart Pro Controller, which is highly recommended with the Espar D4L. This controller gives you full control over the brushless motor, with stepless adjustment to the heat output of the heater. It also gives accurate information about the heater and provides easy-to-read fault codes in the case of an error.


Technical Specifications of the Espar D4L:

Fuel type: Diesel

Voltage: 12 Volts

Max Power: 4 kW

H-Kit Compatible: Yes (integrated), no additional kits required.


Part numbers:

Eberspacher heater: 25.2729.05.0000 / 25.2729.05.00.00 / 252729050000

Installation kit: 252720800000 / 25.2720.80.0000 / 25.2720.80.00.00 / 25 2720 80 0000


  • Fuel pump (24v)
  • Fuel hose
  • Exhaust Silencer
  • Electrical harnesses
  • Stainless steel exhaust pipe
  • Combustion intake pipe 
  • Flexible ducting (90 mm. diameter) - 0.5 meter
  • Inlet grill
  • Air outlet ball type (90 mm. diameter)
  • Screws, clips and plastic straps required for installation
  • Installation manual CD

Ideal for heating:

  • Truck / Lorry / 
  • Van / Bus
  • Van Conversion
  • Camper / Camper-van / Caravan
  • Construction Machinery / Agricultural vehicles
  • Military / Army/ Defense / Emergency  vehicles
  • Horse Box
  • Mobile Workshop
  • Boat (requires marine kit)

If you want to use this heater in a boat, you will need a marine installation kit. You can add it to your order at the bottom of this page. Please click here to see what is included in the marine installation kit.

Shipping Times:

  • United States - 1 Working Day
  • United Kingdom - 1 Working Day
  • Western Europe - 2-3 Working Days
  • Eastern Europe - 3-5 Working Days
  • Scandinavian Countries - 2-3 Working Days
  • Australia / New Zealand - 2-3 Working Days
  • Rest of World - 2-4 Working Days


Installation, servicing and maintenance must be done in accordance with manufacturer’s guidelines. Failure to follow these guidelines will result in voiding your warranty. 

We provide free technical and installation support via email or phone to all of our customers who purchase a heater, heater kit or other products from Heatso. We take pride in our customer service and want to ensure that your heater system is properly installed. As a result, if you have any difficulties, please do not hesitate to contact us at

If you require removing and/or refitting your item, please visit a local professional or authorised specialist, if you can not find one you can contact us and we will try to recommend a local partner to assist with the task. The cost of removing and/or refitting this item is not covered by the warranty.

Standard/Premium Warranty Terms for Espar/Eberspacher or Webasto Heaters & Heater kits

2 Years + optional 1 year extended Warranty available

If the item has failed within warrantable conditions:

  1. Please fill out the contact form on the “Contact us” page.
  2. A representative will contact you within 24 business hours to confirm the details and assist you further.
  3. If the product needs to be inspected by our service engineer, we will provide shipping labels for you to print and attach before handing over to our courier for collection.
  4. The shipping label will contain instructions for arranging pickup at your location or drop off at a nearby FedEx location. Follow these instructions to pass the package to FedEx.
    1. *The Label must be attached to the packages before leaving the package with FedEx.
    2. *You can also choose to drop off the item at a FedEx post office instead of requesting a courier collection.
    3. *If after inspection it appears that the item is not warrantable and the malfunction is caused by a non-warrantable condition, we will kindly ask you to cover shipping expenses at a discounted flat rate.
  5. On average, diagnostics of heaters and their parts takes 3 to 4 working days from the moment the item has reached our warehouse.
    1. *The diagnostics report is provided by a manufacturer approved authorised service centre.
  6. If during diagnostics it was concluded that the fault falls under non-warrantable conditions, our customer support will reach out to you and provide you with an estimated repair cost.
    1. *Please note that we strive to provide the lowest possible repair prices.
  7. Under normal circumstances it can take 3-7 working days after diagnostics to repair most minor malfunctions.
    1. *Please note that each case is unique and your repairs may take longer depending on the fault.


*Please note that all deadlines above are approximate and everything depends on the specific details of each case.

**If your item has been installed by a third party, please save all the documentation.This documentation can help find and fix the fault faster.