DBW 2010 Coolant Diesel Heater Kit, 12v, 45.000BTUParts Number: 920266 Webasto, Designed to provide engine pre heat and interior heat in one unit, the DBW 2010 can do it all with 45,000 btu h heat output. The DBW 2010 draws in cold engine coolant, then heats it and pumps it back to the vehicles engine and HVAC system. The result is a pre heated engine and warm interior. In extreme climates, you can also use the DBW 2010 with additional accessories to warm the fuel and keep it from gelling Coolant