Free shipping to USA and Canada on orders over $499

Worldwide Delivery

Free shipping to USA and Canada on orders over $499

24h-72h delivery

Espar / Eberspacher Hydronic S3 D5E CS 12V water / engine heater

(2 reviews) Write a Review
Usually ships in 24 hours
Calculated at Checkout
  • Espar / Eberspacher EasyStart Pro Timer 221000352200
  • Kalori Silencio FAI heater 1.7kW 12V - Image 01
  • Kalori Silencio 2 Heater 5.5kw 12V - Image 01

Espar Hydronic S3 D5E Water Heater D5-H3-CS 

An upgraded version of the tried and tested D5S diesel heater, the new Espar S3 D5E was designed with the highest quality and performance standards in mind. This third-generation hydronic heater is popular with users for its compact size, silent brushless motor, and improved fuel pump piston. These and other features make it the quietest heater in this category. The unit also boasts a unique residual heating system that allows the heater to operate after the engine is shut off.  The fully installation kit from Espar is the definition of plug & play, with no extra parts required. 

Latest upgraded unit 2020 version.

Key features of the Espar Hydronic D5E Water Heater

  • This Espar D5E water heater operates at altitudes of up to 1,500 meters / 4,900 feet. 
  • When bundled with the EasyStart Pro controller, it can operate at even higher altitudes - up to 3,000 meters / 9,900  feet.
  • The heating output is between 1,300 and 5,000 kW. 
  • The heater itself can operate in extreme conditions – from -40°F to +175°F (-40°C to +80°C).
  • Serving as the perfect replacement for the D5WSC system, this heater is popular with boat owners, being the quietest heater on the market in its category.
  • It comes available in both 12V and 24V options.
  • The Espar Hydronic D5E water heater supports CAN, LIN and S+ system communication protocols, which means it is compatible with older generation controllers.
  • The EasyStart Pro controller, which is a popular option with this heater, allows for automated temperature control (thermostatic function).
  • You get more accurate on-screen fault diagnostics thanks to the new controller communication system.
  • The heater features a stepless system that adjusts the fan speed according to the temperature in order to optimize efficiency and increase comfort levels.
  • The water flow is 500 liters per hour, and a water / coolant pump is included in the kit.

User benefits of the Espar Hydronic D5E Water Heater

Being smaller than previous Espar coolant heaters, this compact heater is extremely easy to install. Due to its size, it can be installed in a range of vehicle and vessel applications, and can also be mounted externally. The kit comes complete with mounting brackets, clamps and screws, and can be installed without any additional parts. Convenience aside, the Espar S3 D5E CS is one of the quietest units on the market, partially due to its integrated air exhaust and intake silencer. It is also easy to control and run diagnostics for faults and errors. This upgraded heater features a brushless fan and an improved water pump, which increase the lifecycle of the heater from 3,000 to 5,000 hours. Providing the benefit of residual heating, the Espar S3 D5E CS can help save both power and fuel. What’s more, this model can run an independent heating loop, with multiple accessories connected to it.

The model is versatile and can be connected to a variety of water and air exchangers. It can also use either its internal temperature sensor or an external controller. Because the unit is compatible with CAN, LIN and S+ system communication protocols, you can connect an earlier generation controller with no hassle. However, to get the best out of your Espar S3 D5E CS, we recommend bundling it with the EasyStart Pro controller.

Who the Espar Hydronic S3 D5E CS is suitable for:

The Espar Hydronic S3 D5E CS diesel engine heater is a solid choice for both vehicle and vessel application. This new model can help you cost-effectively heat your:

  • Truck or semi-truck
  • Van or converted van (Mercedes, Freightliner, Dodge Sprinter, Fiat Ducato, Ram Promaster, Ford Transit, Nissan NV, VW Crafter)
  • Campervan or caravan
  • Machinery (construction/agriculture/mining)
  • Military / Army / Defense / Emergency vehicle
  • Railway machinery
  • Bus
  • Horse box
  • Mobile Workshop
  • Boat (requires marine kit, which you can add to your order)

Heatso’s engineers are here to help

The Espar S3 D5E CS 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 onhand 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 specifications




Diesel – EN 590*

Heat Flow Control





Heat Flow










Fuel Consumption

l / h





gal/ h




Average Power consumption





Average Power Consumption while Starting



Rate Voltage



Allowed operating pressure


Up to 2.5 bar

Minimum water flow rate

L / hour



gal / hour


Dimensions LxWxH


215 x 91 x 144

*20 percent mixture with FAME is permitted – EN 14214


Water pump:

Water Pump power consumption

Approx. 12 watts

Delivery Rate

Approx. 500 liter per hour

132 gallon per hour

Delivery Pressure

0.2 bar





Espar / Eberspacher Part Number:

  • 252934050000 /  252993050000
  • 25 2934 05 0000 / 25.2934.05.0000 / 25 2993 05 0000 / 25.2993.05.0000 
  • 25 2934 05 00 00 / 25.2934.05.00.00 / 25 2993 05 00 00 / 25.2993.05.00.00


  • Espar Hydronic D5E S3 Heater 252934050000
  • Fuel Metering Pump
  • Water Pump
  • Water nozzle x 2
  • Ring x 2
  • M5 Bolt x 18
NOTE! 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: • Please fill out the contact form on the “Contact us” page. • A representative will contact you within 24 business hours to confirm the details and assist you further. 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. • 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. • On average, diagnostics of heaters and their parts takes 3 to 4 working days from the moment the item has reached our warehouse. (The diagnostics report is provided by a manufacturer approved authorised service centre.) • 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. (Please note that we strive to provide the lowest possible repair prices.) • Under normal circumstances it can take 3-7 working days after diagnostics to repair most minor malfunctions. (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
    easy instal

    Posted by Rick on 25th May 2020

    This is the latest model I believe and it is super easy to install. No cable crimping - thank good. Super quiet also

  • 5

    Posted by Jeremy on 11th May 2020

    Everything as described in description. Though, I still had few questions and got in touch with Heatso. They were very professional and helpful. After talking with them I was confident in my purchase. Recommended!