Arctic Fox's Bio Diesel Compatible In-Line Diesel Fuel Warmer, No. I-909BTEH-B100, combines engine coolant and 110V electric preheat allowing users to reduce the use of blended fuel and additives in cold weather. The warmer works with all fuel blends including biodiesel up to B100. It can be integrated into electric block heaters for easy plugin options and includes integral thermostat control to maintain optimum fuel temperature. Easy mounting options and long life provide a solution that can last life of the truck.