20 Sqft Mat, Electric Radiant Floor Heat Heating System with Aube Digital Floor Sensing Thermostat Electric Radiant Floor Heat Heating System used to heat tile and other types of flooring. The system is designed to heat the designated square footage when installed in mortar under ceramic or porcelain tile, stone or brick floors, as well as engineered wood, vinyl, laminate, or carpet floor coverings. The heating mat is simply laid out on the floor in the area you want to heat prior to floor installation. The heating element is less than 1/8" thick, so the rise in flooring height is negligible. This system is BRAND NEW. The wire is pre-spaced at 3".