Heat-Line Heat-Line is a job-ready, freeze protected polyethylene pipe for use in new installations where pipe and freeze protection of domestic water supply is required. Heat-Line is manufactured complete with self-regulating heating cable, factory installed inside a 75 PSI, CSA approved polyethylene pipe. Available up to 300 feet in length; 3 watts per foot at 50°F. Retro-Line Retro-Line is a job-ready, freeze protection kit designed for protection of existing polyethylene water supply pipes. Retro-Line is inserted directly inside the pipe using a unique dispensing system called "Retro-Reel". This reel helps to deploy the product into the pipe with absolute ease, while protecting it from mechanical injury. Available up to 550 feet in length; 3 watts per foot at 50°F.