This 120 volt Sun Touch WarmWire(R) cable will cover 100 square feet when installed at 3 inch spacing. It is designed for interior floor installation and to provide heat to both warm the floor and help keep bathroom, kitchen, and entryway floors dry and safe. The cable system consists of an electric heating wire that is built with a tough, water-proof jacket and is a consistent outside diameter. It is secured to the subfloor with cable straps, hot glue, or an underlayment designed to hold heating wire in place. It is then covered with thin-set or self-leveling mortar. The temperature of the floor is controlled with a SunStat programmable or non-programmable thermostat.