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 12 nonflammable 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 builtin thermostat that switches the flow of electricity on and off based on temperature 120 volts 7 watts per foot CSA listed