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The power is supplied by a transformer, and when the thermostat makes contact between the 24 volt power and one or two of the other wires, a relay back at the heating/cooling unit activates the corresponding heat/fan/cool function of the unit(s).
Boiler thermostat. Your boiler thermostat sets the temperature of the water that will be pumped from the boiler through the radiators to heat your home. The higher this is set, the quicker the system will heat your home.hatever the age of your boiler, fitting a boiler thermostat, a timer or programmer, a room thermostat and thermostatic radiator valves (TRVs) can help you save money on your fuel bills. Correct boiler controls can also help to ensure that your system meets the requirements of Part L of the Building Regulations.