HISFW 50-Feet 120V Self Regulating Heating Cable, Wet or Dry,Industrial GradeKeep water pipes from freezing, prevent freeze up, problems on freezer doors, drain pans, drain lines. Self regulating heating cable output will adjust automatically based on the ambient temperature at each point along the cable. Use on Roofs, Gutters, Downspouts, Roof Drains, Marine, Lighter Plastic or Metal Pipes Up to 8" Dia. 7 Watts per Foot @ 40F Standards: UL515,UL1588,IEEE515. IEEE515. 1 and CAN CSA C22. 2 No. 130 03 Use on Wet or Dry location,