The diagram illustrates the main components of a domestic central heating system and how they interconnect to supply both hot water and central heating.
Overall, the system consists of a cold water supply feeding into a storage tank, a boiler for heating water, a series of radiators throughout the house, and a pump to circulate hot water. An overflow pipe ensures excess water can escape, while taps draw hot water for household use.
In the roof area, cold water enters the house and fills a small water tank, which in turn supplies a larger storage tank. An overflow pipe is attached to this storage tank to discharge surplus water if the level rises too high. From here, cold water descends via small tubes to the boiler, typically located in the basement, where it is heated using gas or oil.
A pomp, situated near the boiler, propels the heated water through a network of radiators distributed around the house, providing space heating. After circulating through the radiators, water returns to the boiler for reheating. Meanwhile, the hot water also passes from the boiler to household taps for general domestic use