Various controls are incorporated into heating systems.
The programmer turns the boiler on and off automatically according to the settings you give it. These may be very simple affairs or may be more elaborate with the ability to have different time settings for weekdays and weekends.
Thermostats switch the pump on and off or open a motorised valve according to the temperature of the surroundings.
Thermostatic radiator valves are used to switch the flow on and off to individual radiators.
Energy managers can be fitted to control the operation of a boiler to minimise energy waste. Instead of allowing a boiler to be turned on and off frequently as water temperatures fluctuate slightly, these devices override the system and manage energy use efficiently.
The hot water supply is, in the case of a conventional boiler, heated by a pipe which runs from the boiler, coils through the hot water cylinder, and returns to the boiler. The water in the cylinder is completely separate from that which goes through the boiler.
The temperature of the hot water is controlled by a cylinder thermostat which switches the pump on and off or opens a motorised valve.
In the case of combination boilers, mains water is heated on demand as it is drawn. Again, the two lots of water are separate from each other.
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