This 6ft 42watt Water Pipe Heating Cable helps prevent costly damage by preventing copper and PVC pipes from freezing, enabling water to flow freely. The built-in thermostat turns on the heating cable when it senses the temperature at 40°F and protects pipes from cracking and water from freezing down to -40°F/C. CPPH002 For use on indoor plumbing and with proper pipe heating cable insulation (sold separately).