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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 thermostats set the temperature of the water that will be pumped to the radiators. The higher this is set, the more energy will be used and the hotter your radiators will become.oiler controls and thermostats. Central heating boiler costs, particularly operating costs, can be minimised with the right combination of thermostats and controls. Ideally, a full set of controls will include a thermostat for the boiler, a thermostat for each room and TRVs (thermostatic radiator valves).