Cadet UCT2B Perfectoe DP built-in thermostat kit, black Double pole (4-wire), positive off When turned completely counterclockwise, thermostat is off For control of the Cadet Perfectoe (UC) series heater Setpoint temperature range: 40 DegreeF to 85 DegreeF (4.5 DegreeC to 29.5 DegreeC)