Frost King s Automatic Electric Heat Cable Kits keep your pipes from freezing in the winter. With a built-in self-regulating thermostat the Frost King Electric Heat Cable Kit automatically keeps your water pipes from freezing. No more frozen pipes! For use on 2 in. metal and plastic water pipes this cable kit keeps water flowing down to -40 degrees Fahrenheit. Plug has a power indicator light to easily and clearly indicate that the kit is enabled. Built-in thermostat; 6 feet 120V 7 Watts per foot.