Espar / Eberspacher Airtronic D4 Diesel Heater 12V

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NOTICE: This 1st-gen Espar Airtronic D4 has been superseded by the 2022 3rd-gen Espar Airtronic M3 D4L Heater Kit

Eberspacher Airtronic D4 12v Air Heater 

The Airtronic D4 heater is the well-known and reliable predecessor of the D4L and D4R. Tried and true, you can't go wrong with this 12V 4KW diesel heater. It's perfectly suited for trucks, campervans. caravans, and large RVs. Together with the additional fuel pump and installation kit, you get everything you need for a quick and straightforward installation that will let you use the heater straight away.

Technical Specifications:

Fuel type: Diesel

Voltage: 12 Volts

Max Power: 13,650 BTU (4kW)


  • Eberspacher Airtronic D4 12v Heater

  • Fuel pump (12v)

  • Installation manual CD

  • Warranty documentation

Ideal for heating:

  • Truck

  • Van

  • Campervan

  • Caravan

  • Horse Box

  • Mobile Workshop

  • Boat (requires marine kit)

Eberspacher Part Number:

  • 252113050000

  • 25.2113.05.0000


  • 25 21 13 05 00 00


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.

4 Reviews Hide Reviews Show Reviews

  • 5
    Excellent service

    Posted by Frank Holden on 27th Jun 2017

    I bought this unit together with a wiring loom and controller in February '17. It was to replace a +30 year old unit on my Patagonia based 39ft yacht which had 'gone terminal'.
    Deliver to Australia - for onward carriage to Chile - was fast, cheap, and efficient. Excellent people to deal with.

    Be aware however that you may need to include a hood/outlet in your order as they are not included.

  • 5
    First class product and service

    Posted by J A Christie on 22nd Sep 2015

    I was very pleased by the product, it's price and the delivery service. Recommend this company.

  • 5
    Eberspacher d4

    Posted by Alistair on 4th Mar 2015

    Good prompt service. Good price Thanks

  • 5
    All good

    Posted by Melvin on 23rd Jan 2014

    All good, fast shipping, excellent service and you have another satisfied customer.