Temperature limiting and temperature regulating heater as an integral component of polyethylene water pipes to prevent fluids from freezing for installation and use in existing systems, namely, potable water supply pipes, roof gutters and down-spouts, drainage lines, drainage tiles and leach fields, sewage lines, tanks and vessels, gutters and pipes, all sold as a unit; pipe heating cables; electric water-pipe freeze protection cables; heat tracing cables for use in heating roofs, gutters, drainage lines, drainage tiles, sewage lines, gutters and pipes, and thermostatic controllers for use with the aforesaid, all sold as a unit