2.2A (ampere) Warm Tiles electric floor warming cables deliver affordable comfort and luxury. Easily installed on subfloor or concrete slab, in thin-set or self-leveling compound materials. Use under ceramic, slate, stone, engineered wood, or laminate floor coverings. Designed to supply at least 12W (watt) per sq ft (square foot) when installed properly. 120V (volt). UL listed (Underwriters' Laboratories to USA and Canadian Safety Standards. This kit covers up to 19 sq ft. Non-programmable thermostat and programmable thermostat stocked/sold separately.