Kim Hotstart TPS151GT10-000 Engine Coolant Block Heater MFG. LIST $195.39. Molded from high Impact rust & corrosion resistant "PPS". Vibration and shock tested. Incoloy element for longer service life. Thermostat regulates coolant temperature between 100-120 degrees F. Greatly reduced heat loss for more efficient operation. All parts are field replaceable  Not a throw - away design.