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The Honeywell CM921 Wireless Programmable Thermostat is a wireless thermostat providing control over the time and temperature of the domestic central heating system. The CM921 Programmable Thermostat allows the user to programme different time and temperature requirements for the day but where the heating needs to be the same from day to day. The CM921 Wireless Programmable Thermostat has a slim modern design that is complemented with a large LCD screen with Line of Text display and one function button for quick and simple operation and programming.
The Honeywell CM921 Wireless Programmable Thermostat can be used to control the heating circuit in a sundial S or Y plan and is well suited to control a combi boiler installation or additional heating zones in an S plan plus system.