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Espar / Eberspacher Airtronic S2 D2L 12v (2.2kW) Heater Kit

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  • Espar / Eberspacher EasyStart Pro Timer 221000352200

Espar Airtronic S2 D2L diesel heater kit

The Espar Airtronic S2 D2L diesel heater kit is the most commonly used and recommended diesel heater for van set up on the market for a reason. Fuel efficient, and reasonably priced, this Espar S2 D2L heater kit provides 2.2kW/7500 BTU maximum output, and can even function at high altitudes of up to 9900 feet (3 kilometres) when fitted with an EasyStart Pro controller for altitude adjustment. But what really sets this Espar diesel air heater apart is its engineering - it comes with a brushless fan for extra comfort and an improved pump which reduces clicking noise, meaning it can be fitted anywhere without impeding rest or sleep. And for added performance and convenience, this 2nd gen Espar diesel heater comes with an integrated temperature and altitude sensor. Not only that, with all Espar diesel heaters being manufactured in Germany, getting parts and maintenance is simple and straightforward. And the Espar Airtronic S2 D2L diesel heater kit (Build-yourself )is not only ideal for regular or converted campers or food vans, this diesel air heater is also perfect for maritime usage, and can be easily integrated into yachts, sailboats and narrow boats using a marine kit.

Key features of the Espar Airtronic S2 D2L diesel heater kit

  • All in one kit. Nothing else is required for installation if you are connecting to an existing fuel line.

  • Environmentally friendly improved combustion operation

  • Simplified same line fuel system installation 

  • Air ventilation mode available on all Airtronic S2 M2 models

  • Brushless fan delivering 5k hours of heating, 2k hours more than previous models. 

  • Brushless fan for quieter performance, and longer heater life. 

  • Stepless blower system adjusts fan speed according to set temperature and actual vehicle temperature for maximized efficiency and increased comfort levels.

  • Improved fuel pump piston reduces CLICKING noise.

  • Integrated altitude sensor for operation in higher altitudes up to 9900 feet – No additional wiring and installation are required

  • New controller communication system providing more accurate on-screen fault diagnostics

  • Easy to install plug and play system installation, requiring less tools and no cable crimping

  • Same dimensions as the Espar Airtronic D2 Diesel Heater Kit

  • Automatic temperature control with integrated temperature sensor when equipped with EasyStart Pro controller

  • Uses the same 3-communication protocols technology as other Espar diesel heaters ( CAN, LIN and S+), making it easy to update to newer models. 

  • Simple S+ signal connection, giving users an on/off switch capability. 

  • Shares accessories with previous models

  • Available in 12V and 24V 

  • Air ventilation mode available on all Airtronic S2 D2L models

User benefits of the Espar Airtronic S2 D2L diesel heater kit

Coming in 12V or 24V options, the Espar Airtronic S2 D2L diesel heater kit gives you unrivaled features and performance at a great price point. Easy to install and compact in size, this Espar S2 D2L heater can be installed in a number of vehicles or marine operations (NB: Marine kit is required). And as it’s a plug and play kit, it requires no specialist knowledge and has been designed so that it can be installed without fuss or difficulty. What’s more you’ll find that everything you need is included in the kit. And when it comes to performance, this heater has a lot going on. Utilizing brushless technology, this updated model is quieter, more durable and long lasting. In fact, it delivers 5K hours of heating, 2k more than the previous model. What’s more, with its improved fuel pump piston, clicking noise has been reduced, meaning you can install this Espar S2 D2L heater wherever you want without having to worry about having your rest interrupted. The heater has thermostatic functions to help better regulate heat, and comes with a timer for added convenience. Temperature can be controlled using the unit's internal temperature sensor, or for enhanced control an external temperature controller can be added. What really separates this model from its competitors is its on-screen diagnostics that narrow down exactly where any issue stems from. Not only that, Espar diesel heaters come with automatic altitude adjustment that allows them to be used at up to 9900 feet (3 kilometres). And there are numerous installation options: this Espar diesel heater can use 60mm or 75mm outlet ducting, and can be mounted externally using the separate airtronic D2L external mounting box. 

What the Espar Airtronic S2 D2L is suitable for:

  • Trucks / Lorries / Bus

  • Van / Vanconversion (Sprinter, Ducato, Crafter, Hymer etc.)

  • Campervan

  • Caravan

  • Construction machinery , Agricultural machinery

  • Military / Army / Defense / Emergency vehicles

  • Horse Box

  • Mobile Workshop

  • Boat (requires marine kit)

Heatso’s engineers are here to help

The Espar Airtronic S2 D2L is an excellent heating option for your vehicle. But if you have any questions about it, or would like to hear about other options, our customer service is on hand to help. And when you do find the ideal solution to meet your needs, our engineers are available to talk you through the whole installation process, step by step.

Technical data:



Diesel – EN 590

 Heat Flow Control





 Heat Flow










 Fuel Consumption

l / h





gal/ h




 Average Power consumption





 Average Power Consumption while Starting



 Rate Voltage


12 volt or 24volt

 Dimensions LxWxH



Eberspacher / Espar Part Number:  

  • 252721050000 

  • 25.2721.05.0000 

  • 25 2721 05 0000 

  • 25.2721.05.00.00

  • 25 2721 05 00 00 

Installation kit 252720800000 Contents: 

  • Fuel pump (12v)

  • Fuel hose

  • Fuel T piece kit

  • Controller of your choice

  • Exhaust Silencer / Muffler

  • Electrical harnesses

  • Stainless steel exhaust pipe - 900mm

  • Combustion intake pipe 1 meter

  • Flexible ducting (60 mm. diameter) - 0.5 meter

  • Inlet / Outlet grills

  • Air outlet grill (60 mm. diameter)

  • Screws, clips and plastic straps required for installation

  • Installation manual CD

  • Warranty documentation

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 [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.

9 Reviews Hide Reviews Show Reviews

  • 4
    S2 D2L

    Posted by Hasan Sume on 3rd Jan 2021

    Install was daunting at first but ended up being fairly easy. Best resource for install is YouTube. Literature that comes with it was pretty much useless. A little spotty on performance to start but after four or five times it worked perfectly. Tested in Death Valley set at 68 F all night with minimal fuel consumption and battery drain.

  • 5
    Espar 2 d2l Heater

    Posted by Ron on 2nd Oct 2020

    Tech support is outstanding. Quick and thorough. Excellent follow up.

  • 5
    trully amazed

    Posted by Bjorn Noll on 1st Sep 2020

    Great little runner. compared to my old unit this is much quieter, which is very noticeable since my van build was some time ago and my Mercedes T2 had d1l installed in the back. amazed how much quieter my sleep is with this airtronic

  • 5
    Fast Shipping - Great Product

    Posted by Mike on 15th Dec 2019

    Shipping was unbelievably fast. Shipped from UK to US in 2 days... For FREE! I was blown away. Box was a little beatup, but everything arrived intact. This is a great kit for Sprinter/Van conversion. It has basically everything you need and some extras. I did end up getting a 5/16 to 1/8 hose barb fitting and some heat shield for the fuel line locally but other than that this kit was complete. Thanks Heatso!

  • 4
    ESPAR AIRTRONIC S2 D2L 12V Heater Kit

    Posted by Carla Singleton on 11th Dec 2019

    The heater works great and we are very happy with the purchase. The only reason for four stars instead of five is that when the auto dealership was installing the heater they told us the fuel filter was not present. So between parts and labor it cost $100 to get a fuel filter installed.

  • 5
    5 stars

    Posted by A&J nomads on 4th Dec 2019

    I can't express enough how happy I am with going with this model, because you can't get anything better at this price IMHO. Installation is pretty straightforward if you have some DIY skills and this kit really had all the bits we needed for our installation (just make sure you get the mounting plate). Fast shipping and really helpful customer service. happy!!!

  • 5
    Best heater out there

    Posted by Allan Tone on 25th Nov 2019

    This is the heater we install in all our custom van builds. Dependable, quiet, and hot. Works at altitude too!!

  • 5

    Posted by BH on 14th Oct 2019

    I installed this myself on a 2018 Sprinter van and found it all to be pretty straightforward. Plenty of videos online to provide tips specific to the Sprinter. Paired with the easy start pro timer and works great. I didn't need to purchase anything else to make it all work.

  • 5

    Posted by Jörg Gerschau on 29th Mar 2019

    Much easier installation with all the plugs Such a quiet unit compared to older D2