This electric radiant floor heating thermostat controls the floor temperature with input from the included floor sensor. Compatible with 120 and 240 voltage, includes GFCI for safety, and a 15 amp maximum load. Has a built in relay system and is compatible with most floor heating systems using a floor sensor wire. Simple home temperature adjustment with up and down buttons and easy-to-read, backlit display. This thermostat measures 5 inches high, 3 inches long and 2 inches wide.