Description FASS Fuel Systems Titanium Series High Output Heater Disk HK1002 Part No: HK1002 Supersedes Part No: HK-1002 When the fuel temperature drops below 34° Fahrenheit, the thermostatically controlled High Output Fuel Heater Disk will automatically power on. Fuel is then heated by the 300-watt heating element as the fuel is entering the FASS System, preventing gelling of the diesel fuel in the FASS filters. As the FASS continually polishes the fuel it will heat the fuel in the fuel tank,