Heat-Line provides pipe frost protection kits for many different applications such as a heat trace water line. A heat trace water line typically refers to a system designed to provide trace heating for water pipes by applying heat trace wire to a water supply pipe. Retro-Line is an innovative in-pipe heat trace water line developed by Heat-Line which makes installation easy while providing long lasting, reliable freeze protection. It consists of a self-regulating heat trace wire that installs inside the water pipe as well as all necessary plumbing fittings and a plug-in power lead. The self-regulating heat trace wire and exclusive end seal ensure dependable freeze protection in the most demanding temperatures. A further advantage of the Retro-Line heat trace system is that it does not need the downward end of the trace heater cable secured in the pipe. Installing the heat trace system inside the pipe, and not requiring access to the downward end, saves property owners from costly excavation.