T822K1000 Honeywell 24Volt Heating Thermostat. Replaces obsolete T822D1032. Genuine Honeywell part. Vented cover for improved temperature sensing. Coiled bimetal element. Setting lever and thermometer scale on thermostat face. Mounts directly on the wall or on vertical outlet box. Mercury Free Heat Only Thermostat with Positive Off for control of single stage low voltage heating systems. Dimensions (in.) 4 3/4 in. high x 2 7/8 in. wide x 1 3/8 in. deep. Dimensions (mm) 121 mm high x 73 mm wide x 35 mm deep. Temperature Range (F) 55 F to 95 F. Voltage 20 to 30 Vac.