PVC pipe is usually rated as being able to withstand temperatures between 140 to 160°F. The trick is to insure the heat trace cable will maintain the contents within the PVC pipe at a desired temperature, but never to approach the pipe rating temperature. Depending on the heat loss characteristics of a specific pipe system, manufacturers generally limit heat cable below 6 watts per foot.
Self Regulating Heat Trace Cable
Self-Regulating Heat Cable is commonly used for freeze protection of water and drain lines, and for protecting residential and commercial roofs and gutters from ice dams. The temperature rating is for the heat cable’s outer jacket and has nothing to do with the actual temperature of the cable. For most residential applications, you will choose the low temperature cable, as most water lines in the home never exceed 150 degrees.