The Titanium Series electric heaters from FASS are intended as an upgrade for FASS Titianium seires pumps being used in the cold north. Each FASS Titanium Series pump has ports for two electric heaters, that will aid in cold weather starts and keep fuel from gelling up in the filters while driving during sub freezing temperatures. The heater will begin warming the fuel block once the key is in the on position and will automatically shut off after the proper temperature has been reached. Each kit comes with one heater. Use two for moderate to extreme conditions.