Eberspaecher heaters are designed for mobile applications such as truck, bus, marine and automotive. They utilize 12 or 24 volt battery systems and gasoline or diesel as an on-board fuel. Air heaters use forced air as a heating medium, while the coolant heaters circulate the engine coolant to transfer heat. Eberspaecher products are marketed through a variety of after-market supply chains and are an OE installed option on major new trucks, school buses and off-highway equipment. more... See more text