White spare room thermostat without receiver provides room temperature control of heating systems within the home, in a slim, modern design with simple functionality. Features large and clear LED segment display with a wake-up button. Compatible with heat pumps, zoning, underfloor heating and cooling devices as well as zone valves, solid fuel boilers and the replacement market. Backwards compatible with existing Honeywell Home products such as BDR91A. Not suitable for use with electric heating (240V). 5-35°C Temperature Range Suitable for Combi & System Boilers Battery-Powered LED Digital Display Frost Protection 5-35°C Temperature Range Suitable for Combi & System Boilers Battery-Powered LED Digital Display Frost Protection