Description Temperature - controlled cable runs straight along pipe and valves, held in place by application tape and plugs into grounded electrical outlet. Keeps water flowing to -40. Pipe requires 1/2" non-flammable insulation such as fiberglass. For plastic pipe, its recommended wrapping pipe with aluminum foil before cable installation. The traditional resistance cable produces a fixed amount of heat based on the electrical line feed. It comes with a built-in thermostat that switches the flow of electricity on and off based on temperature. 120 volts. 7 watts per foot. CSA listed.PRODUCT DETAIL:Freeze protection for water supply pipes Freeze protection for water supply pipes Fixed resistance UL listed to Canadian safety standards and CSA certified when used in accordance with instructions on water-filled metal or plastic pipes Activated and de-activated by an integral energy saving thermostat Built in thermostat Keeps water flowing at ambient temperatures down to 40 deg C