However, there are limits to self-regulation. Indeed, the cable always gives a minimum heating power and also reaches a maximum power. Ideally, the pipe heated by a cable should also be insulated to retain its heat.
Retro-Line heating cables, Available from 10 feet to 180 feet
“Price of items solds online may differ from the price of the same item when serviced by our technicians.”
At Groupe H2O, we offer heating cables manufactured by Heat-Line®, a recognized Canadian company.
Heating cable is an electrical cable that prevents a structure from freezing. In plumbing, it is often used inside drinking water and wastewater pipes.
The most efficient heating cable is self-regulating. This cable is made of several layers, including a carbon layer that allows for self-regulation of the cable temperature. In other words, self-regulation means that the cable can adjust the heating locally. When there is a cold spot in the pipe, the cable heats up more, but only at that point.
https://heatline.com/wp-content/uploads/2019/10/Retro-Line-Manual.pdf