HeatTech 35-65 sqft Electric Radiant In-Floor Heating Cable System, 120V Area Coverage: 35 sqft @ 2" spacing; 50 sqft @ 3" spacing (recommended), 65 sqft @ 4" spacing. Heating Cable Length: 200ft + cold lead (10ft) Voltage: 120V; Output: 600W (3W/ft.); Amperage: 5 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