Easy Heat Warm Tiles DFT1039 Floor Warming Cable Kit Covers 35-42 Square Feet 120 Volt 480 Watts Coverage Area (35-42 Sq.Ft. 3 Inch Spacing/27-33 Sq.Ft. 3 Inch/1.5 Inch Spacing) - 155 Foot Cable Length Each heating cable has a 10 foot cold lead section. Warm Tile cable is placed in the mortar just below the tiles, never compromising tile installation. Warm Tiles electric floor warming system has been designed to gently warm flooring materials such as marble, ceramic and porcelain tile, laminate, slate, granite and poured or dimensional stone Warm Tiles system radiates gentle warmth through a network of low profile cables.