Thermostat to be used with the radiant heat Quiet Warmth Underlayment Pad. Thermostat is programmable and comes with a 3 year warranty. Dual voltage 120V/240V. The thermostat is an electronic On/Off thermostat for control of temperature by means of an NTC sensor either placed externally or internally in the thermostat and has integrated a Ground Fault Circuit Interrupter. Settings for Celsius or Fahrenheit. 15 Amp.