Thermo Pro 90 and Thermo Pro 50 engine-off coolant heating systems from Webasto are designed for use in specialty commercial vehicles and off-highway equipment. Both offer automatic high altitude adjustment up to 11,000 ft (3350 m) and improved fan motor durability. The Thermo Pro 90 is biodiesel compatible for improved performance and service life. It also offers quick warm-up times and low power consumption with up to 31,000 Btu/h of heating power. Compact kits are available, while a heavy-duty version includes additional fittings and clamps for rough terrains. The Thermo Pro 50 features compact dimensions, a lightweight design, and improved service life. Thermo Pro 50 is capable of up to 17,000 Btu/h of heating power and is available as a standard or heavy-duty kit.