Summerstep SS11824010 Electric Floor Heating Mat, 120V, 18" x 20', Gray Ultra-Efficient Graphite Floor Heating Mat 30 Square Foot Under Floor Heating Mat 18" Wide x 20' Long, 300 watts, 2.50 amps, 120 Volts Very Thin They incorporate cutting-edge, highly efficient, heat spreading technology, which enables our heated floor systems to provide you with quick, comfortable, even heat