The Webasto Thermo Top Evo Coolant Heater operates directly from diesel fuel drawn from the vehicle’s primary fuel tank. Its compact size makes it ideal for installation in vehicles with limited space and its coolant inlet and outlet ports at the top can rotate up to 180 degrees, offering greater flexibility for routing coolant lines. The coolant heater operates at a higher maximum combustion air temperature that allows it to be mounted in more locations within the engine compartment. It also gives users the ability to read simple fault codes at the controller, enabling the driver to identify the specific fault category while on the road and to make the necessary adjustments.