Self regulating heating cables are specifically designed for freeze protection and de icing or thawing of metal or plastic pipes and valves and dangerously cold temperatures.
Water pipe freeze protection cable installation instructions.
Down to negative 40 degrees fahrenheit or negative 40 degrees celsius.
Never use a cable longer than the pipe it is.
The hca application tape is rated for use with pipe heating cables and marked.
Before insulating check to be sure heating cable is free from mechanical or thermal damage cuts or nicks in cable insulation from utility knife use of metal clamps solder or over heating.
Namsrk installation instructions for pipe freeze protection installation note.
How to install warmup heat tracing cable read this.