Compatible with all indoor floor heating systems, our attractive and elegant thermostat line provides the comfort and precision you desire with state-of-the-art technology. For your safety, all of our indoor floor heating thermostats are protected against malfunction by a built-in ground fault circuit interrupter. Non-programmable, electronic, double-pole, 4-wire thermostat for floor heating system Auxiliary contact offers the possibility of controlling supplemental heat sources to be added by either using a slave module (TR1310-120-240GA) for heated floors or using a low voltage relay and a low voltage transformer for an electric heater Digital display of actual and setpoint temperature deg C or deg F, heating level GFCI fault indicator 4-wire thermostat with ambient and floor sensor