Wireless Relay boxes provide a wired connection to the boiler that allows Honeywell wireless controls to send signals to the domestic boiler or motorised zone valve

This wireless relay box is used with a number of Honeywell heating controls to provide the switching link between valves, pumps, boilers or other heat sources and a number of Honey-well Wireless products. Honeywell products include the CM927& CM921 range of wireless programmable thermostats; the complete Sundial...
OpenTherm provides more precise control on the boiler through the control of the gas valve. It allows the amount of heat provided by the boiler to be controlled to match the varying demand signal. By reducing the flow temperature to a minimum as it leaves the boiler, the return temperature is kept below the dew point...
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