100sqft 120V HeatTech Electric Radiant Floor Heating Cable Kit, 400ft long heating cable covers 65-135 sqft + Aube Digital Floor Sensing Thermostat TH115-AF-120S with floor sensor + FREE Cable Guides 100sqft Electric Radiant In Floor Heating Cable Length (spool of wire): 400ft long. Allows easy heating of odd shapes Area Coverage: 65 sqft @ 2" spacing; 100 sqft @ 3" spacing (recommended), 135 sqft @ 4" spacing. Voltage: 120V; Output: 1,200 W (3W/ft.); Amperage: 10 Amps. Zero EMF. Heating cable is only ~1/8" thick. Includes AUBE radiant floor sensing thermostat TH115-AF-120S with floor sensor UL LISTED for USA and CANADA. 25-year Manufacturers Warranty