The T822K1042 is a Honeywell non-programmable heat only thermostat with the capability to be set at from 35F to 85F. It is the superior option for electromechanical replacement. The T822K1042 from Honeywell is a non-programmable heat only thermostat from the T822K series. It has a vented cover for better temperature sensing and a setting lever and thermometer cover. It is able to be placed directly on the wall or on a vertical box. It is the ideal electromechanical replacement.