Honeywell Low Voltage Thermostat, Series: T822K, Non-Programmable Thermostat, SPST Switch Action, Precision Snap Action Switch, Terminal Designations: R, W, System Switching: Heat/Off, Bi-Metal Sensor, 1 Stage, 20 to 30 VAC, Vertical Mounting, Premier White®, 2-7/8 in W x 1-3/8 in D x 4-3/4 in H, Import