Advanced Coolant Heaters


Thermo Top Evo coolant heater is the latest in a long line of proven engine-off heating technologies from Webasto and operates directly from diesel fuel drawn from the vehicle’s primary fuel tank.


The Thermo Top Evo is more flexible to install, more intuitive to diagnose and features a quieter heater and fuel delivery system. With its efficient 8,600 to 17,200 BTU/h (2.5 to 5.0 kW) range and ultra-low power consumption, the Thermo Top Evo is more than capable of pre-heating a wide range of vehicle types, from light-duty commercial vehicles to heavy-duty trucks.


The Thermo Top Evo’s compact size and new features make it perfect for installation in vehicles with limited space. Its coolant inlet and outlet ports at the top of the heater can rotate up to 180-deg., offering greater flexibility for routing coolant lines.


The unit comes with a longer fuel line, universal controller harness and mounting bracket. The Thermo Top Evo also operates at a higher maximum combustion air temperature that allows it to be mounted in more locations within the engine compartment.


The Thermo Top Evo also gives users the ability to read simple fault codes at the controller without the need for ancillary equipment or software. This feature enables the driver to identify the specific fault category while on the road and to make the necessary adjustments. The Thermo Top Evo can be controlled manually or programmed to turn on in advance via Webasto’s SmarTemp Control fx 2.0 so the engine is pre-warmed when the driver arrives.


Many of the Webasto fuel-operated heater products are listed under the “Verified Idling Reduction Technologies” category by the EPA SmartWay Program. Webasto coolant heaters are extremely fuel-efficient, helping achieve optimal engine starting temperatures while reducing engine wear, fuel consumption, and exhaust emissions. A Webasto engine pre-heater also delivers a fast ROI in the form of improved fuel cost savings and reduced DPF maintenance.

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