LUX Heat Only Thermostat, 24 VAC, Stages Heat: 1, Mechanical Operation, 50 to 90 deg F Operating, Wall Mounting, For: 24 V Heating Systems, 1 Stage Heat - Gas, Oil, Electric Systems, 2-wire Heat Only Hydronic Systems (Hot Water Baseboard and Radiator), Millivolt Systems (Wall Heaters or furnaces and Gas Fireplaces), Includes: Wallplate