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Eberspacher / Espar D4L Airtronic 24V Marine Kit

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Espar / Eberspacher Airtronic D4L 24v Air Heater Marine Kit (Includes Pro)

This powerful Espar D4L diesel heater offers reliability, cost effectiveness and versatility in terms of installation. It can operate at high altitudes (up to 9,900 feet / 3,000 m) with automatic altitude adjustment as standard, which means no additional high altitude kit is required. It heats up vehicles quickly, quietly and efficiently, and its power (up to 4kW / 13650 BTU of heating output) and ducting options make it ideal for larger, multi-cabin vehicles. DIY installation is possible, and the unit is easy to use, with thermostatic function, timer and highly accurate on-screen fault diagnostics.

Technical Specifications:

Fuel type: Diesel

Voltage: 24 Volts

Max Power: 13,650 BTU (4kW)

Number of Outlets: 2


  • Espar / Eberspacher Airtronic D4L 24v Heater

  • Marine Installation kit with 2 outlets

  • Digital controller - Pro controller 

  • 5m of ducting (90mm diameter)

  • 2m of ducting (75mm diameter)

  • Air Outlet

  • Y-branch (90mm)

  • Fuel Metering Pump

  • Marine Wiring harness

  • Exhaust hose with silencer / muffler and marine grade insulation + hard cover on top (Length - 2m, dia. - 30mm)

  • Stainless steel hull skin fitting (30mm)

  • Exhaust adapter (24-30mm) with water drain connection

  • Marine fuel line

  • Water drain

  • Stainless steel mounting bracket

  • Combustion air silencer / muffler

  • Fuel Standpipe

  • Screws, clips, clamps and other fixings required for installation

If you want to get the Installation Instructions for the Marine Kit before ordering this heater - please contact us using the Contact Us button.


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 [email protected].

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.