Engine Block Heater CAT C9 15 16 Detroit Diesel Heater One Engine Heater for CAT C9, 15, 16 Non - Acert, And Detroit Diesel 60 Series (Pre 2007) Engines 1500 W, 1" NPT Helps Save On Warm Up Time Saves On Fuel, Prolongs Battery Life Sustains Battery Temp At 80 Degrees F