AHB cables keep water flowing through plastic or metal pipes at ambient temperatures down to -40°F (-40°C) The cables come pre-assembled and ready to install right out of the box The AHB's bright power indicator light lets you know it’s working at a glance The built-in, energy-saving thermostat automatically keeps the pipe at just the right temperature Keep your water pipes flowing for only nickels per day…the energy-efficient AHB cables only consume 7 watts per foot of cable For use on plastic or metal water-filled supply pipes at least three feet in length and up to 1-1/2 inches in diameter only The circuit supplying the AHB cable must have ground fault circuit interrupter (GFCI) protection; consult an electrician if you are unsure that your circuit has GFCI protection Be sure to follow all the installation instructions supplied with the cable and to make sure the installation complies with all national and local electrical codes Installation supplies: scissors, tape measure, file to remove burrs, marking pencil, eye protection, EasyHeat HCA application tape or similar electrical tape, and 1/2-inch wide fiberglass or equivalent non-flammable pipe insulation with vapor seal