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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).
If you have a hot water storage cylinder, it will usually be fitted with a thermostat to control the water temperature. For water that is heated by an electric immersion, the thermostat will be inside the tank. If you heat your water with a combination (combi) boiler, the heating control for your water is on the boiler.