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Eberspacher / Espar Hydronic S3 D6L 24V Heater with Installation kit

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Espar / Eberspacher Hydronic 3 D6L HS3 Commercial 24 Water / Coolant Heater with installation kit

The cutting-edge Espar Hydronic S3 D6L uses the newest technologies to stay compact, silent and fuel-efficient, while outputting up to 6KW of heating.

This heater has advantage of pre-heating the engine as well as the passenger compartment. It uses the vehicle own water system with heat exchanger and fan. 

This is the third generation Hydronic heater (latest model introduced in 2019). The heater has been improved and the main differences from the older Hydronic versions:

  • Improved fuel efficiency,
  • Works faster and it is more reliable than its predecessors.
  • Brushless fan and Step-less system (Increased Service time to 5000 hours)
  • Controlled via EasyStart Pro, which allows Residual Heat use - Uses engine heat to heat interior when the heater and engine is off. 
  • Altitude operation - With EasyStart Pro D6L is suitable to operate up to 3000 meters in altitudes

Benefits of the Espar Hydronic 3 D6L:

  • Double benefits: warming up the passenger compartment and engine and therefore making starting easy, protecting the engine, saving fuel and helping the environment.
  • Comfortable warm air distribution using the vehicles own air vents.
  • Installation in the engine compartment possible in almost any vehicle
  • Pre-cooling possible in summer.
  • Can also be used for central heating in boats (requires special marine installation kit)
  • Installation kit comes with everything you need for universal installation (water pump included in the kit)

Technical Data:

Voltage: 24 Volt

Heat flow range(watt): 1300-5000

Fuel Consumption: 0.15 - 0.59 liters per hour

Pressure: Up to 2.5 Bar

Minimum Water flow rate: 300 liters per hour

Delivery rate: 1400 liters per hour

Part Numbers:

Eberspacher / Espar D6L:

25.2972.05.0000 / 25.2972.05.00.00 / 252972050000

25 2972 05 0000 / 25 2972 05 0000


25.2745.05.0000 / 25.2745.05.00.00/ 252745050000

25 2745 05 0000/ 25 2745 05 00 00

Installation kit:

25.2696.80.0000 / 25.2696.80.00.00 / 25 2696 80 0000

25 2696 80 00 00 / 252696800000

Ideal for:

  • Preheating vehicles, trucks, semi-trucks, vans, cranes, construction machinery, ambulance, etc
  • Central heating for boats (can also be used to provide hot water through an indirect tank)

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.

2 Reviews Hide Reviews Show Reviews

  • 5
    Espar Hydronic into a sprinter van heated floors

    Posted by ofer bruhis on 16th Dec 2022

    The product is amazing. Van was heated to 74F when temperature outside was 20F with 1' of snow on the roof.

  • 5
    Pure heat

    Posted by Caren Tiny RV on 23rd Oct 2020

    We made a custom install, like rv kit available here. Airtronic already installed for air heating so we installed 2 x water HX only for shower and tap. No more army showers!