SunTouch Floor Warming WarmWire 40 sq. ft. 240-Volt Radiant Heating WireInstall below ceramic or porcelain tile, stone or brick floors or in a self leveling mortar bed below vinyl floors, floating wood and laminate floors Install below ceramic or porcelain tile, stone or brick floors or in a self leveling mortar bed below vinyl floors, floating wood and laminate floors UL Listed in both US and Canada for safety Dual wire technology reduces electromagnetic fields to ultra low levels Approved for shower installation where