HeatTech 100 sqft Cable Set, Electric Radiant Floor Heating Cable Kit, 120V, 400ft long, with AUBE Digital 7-day Programmable Floor Sensing Thermostat Area Coverage: 65 sqft @ 2" spacing; 100 sqft @ 3" spacing (recommended), 135 sqft @ 4" spacing. Heating Cable Length: 400ft + cold lead (10ft) Voltage: 120V; Output: 1,200 W (3W/ft.); Amperage: 10 Amps Heating cable is only ~1/8" thick and will not raise the floors significantly. UL listed for USA and comes with a 25-year Manufacturer Warranty