HeatTech 15 sqft Electric Radiant In-Floor Heating Cable System, 120V, With Digital 7-Day Programmable Thermostat With Floor Sensor Area Coverage: 10 sqft @ 2" spacing; 15 sqft @ 3" spacing (recommended), 20 sqft @ 4" spacing. Heating Cable Length: 60ft + cold lead (10ft) Voltage: 120V; Output: 180W (3W/ft.); Amperage: 1.5A; 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