Heat Trace Cable

A heat trace cable (also called a self-regulating heating cable or freeze protection cable) is an electric resistance cable installed along water pipes, roof gutters, downspouts, or walkways to prevent freezing in cold weather. The cable generates heat when energized, keeping the temperature of the protected surface above freezing and preventing ice formation.

In Finnish winters, frozen and burst water pipes cause significant damage every year, particularly in crawl spaces, unheated garages, and exterior wall cavities where temperatures can drop below freezing during cold snaps. A heat trace cable provides reliable freeze protection for vulnerable pipe runs. On roofs, heat trace cables in gutters and downspouts prevent ice dams that can cause leaks and structural damage.

Modern self-regulating heat trace cables automatically adjust their heat output based on the surrounding temperature — they produce more heat when it is cold and less when it is warm, which makes them energy-efficient and eliminates the risk of overheating. They can be cut to any length on site and do not require a thermostat, though adding an outdoor temperature sensor to control power can further reduce energy consumption.

Heat trace cables should be installed before the heating season and checked annually as part of autumn maintenance. Verify that all connections are watertight, the cable is securely attached to the pipe or gutter, and the power supply is functioning. If a heat trace cable stops working, frozen pipes or ice dams can develop quickly during a cold spell. Replace any cable that shows signs of damage, wear, or electrical faults.