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Webasto Thermo Top C Diesel 12v (5.2 kW) Water Heater

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Webasto Thermo Top C Diesel Water Heater 

Webasto diesel water heaters utilise your vehicle’s heating and ventilation system to provide a dedicated heating system for your cabin. The fuel-efficient Webasto Thermo Top C Diesel Water Heater also extends your engine’s lifetime by safeguarding it from cold starts. The water heater is compact in size, weighs just 7 pounds, comes with a water pump, and is easy to install. And once installed, the Webasto Thermo Top C Diesel Water Heater pre-heats both the cabin and the engine to optimal temperatures.

By using this efficient heater you’ll not only reduce wear on your engine, but also contribute to saving the environment, as pre-heating the engine reduces idling time, fuel consumption and the release of CO2.

Made in Germany, the compact and reliable Thermo Top C uses tried and tested technology with millions of units currently in use around the world. This coolant heater is a popular choice with owners of Fiat Ducato, Mercedes-Benz Sprinter, Renault Master, Peugeot Boxer, Citroën Jumper and other vehicles.

Keys features of the Webasto Thermo Top C Diesel Water Heater:

  • Maximum power of the unit is 5.2 kW

  • Heating capacity ranges from 8,600 to 17,000 BTU

  • Comes in 12V (operational voltage range between 10.5V and 15V)

  • The kit includes a Webasto water pump and fuel dosing pump

  • All required mount brackets, screws, wiring harness and fastening elements are included in the kit

  • The kit includes silencer/muffler, stainless steel exhaust system, plastic fuel supply and combustion air intake pipes

  • Requires just 1 gallon of fuel per 10 hours of use

  • CARB approved and EPA SmartWay verified

  • Full diagnostics can be performed via PC interface

  • Water connector pipe/hose with 180 degree bends included in the kit

  • Better performance and increased safety compared to LPG-based models

User benefits of the Webasto Thermo Top C Diesel Water Heater

The 12V diesel heater from Webasto is a compact unit (9.125’’ x 4.125’’ x 6.4’’) that is easy to install and won’t take up a lot of space. What’s more, the unit is sturdy with a durable aluminum casing, but incredibly light, weighing in at only 7 lbs.

This diesel block heater from Webasto provides a multi-purpose diesel heating solution. Portable, small in size and superior in terms of both safety and performance when compared to liquefied petroleum gas (LPG) heating alternatives, this model provides the additional advantage that it can heat both water and air from the same unit.

The Webasto diesel heater is a truly versatile little heater and it can be used to heat your cabin as well. You can easily change the circuit with a switch on the dashboard. The programmable space heater can be combined with a number of useful accessories from Webasto, including a 7-day digital timer, an in-dash timer mounting frame, under-dash timer mounting bracket and heather mounting bracket.

What the Webasto Thermo Top C Diesel Water Heater is suitable for:

  • Vans, SUVs and small buses

  • Caravans, trailer homes, campers and other types of mobile homes

  • Mobile workshops

  • Electric vehicles (EVs)

  • 4x4 vehicles

This Kit Includes:

  • Webasto Thermo Top C 12V Diesel Heater (includes water pump)

  • Webasto Fuel Dosing Pump

  • Plastic Fuel Supply Pipe and Fittings

  • Water Connector Pipe / Hose with 180deg Bends

  • Stainless Steel Exhaust

  • Silencer / Muffler

  • Wiring Harness and Connectors

  • Combustion Air Intake Pipe

  • Fuel supply pipe and Fittings

  • Mount Bracket

  • Installation Manual and Warranty Documentation

Part Number: 9003168C


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.

1 Review Hide Reviews Show Reviews

  • 5
    Ship fast

    Posted by Guido G. on 20th Dec 2013

    Heater arrived in 2 days in Italy! very very good!!!!!