The floor heater is working very nicely. The heating element was ordered to fit under a 5'x7' rug. The installation instructions call for the non slip pad to be 1" longer than the heating element and 1" shorter than the rug over it. This means the length and width of the heating element should be less than 44"X 80" ( 4" less than the rug in each dimension) The heating element was larger than that preventing the full 1" margin on each laver. It was tricky to get the rug perfectly placed to cover the nonslip pad when it was cut to the recommended size.