There are 5 main components for your central heating system to circulate hot water around the system in order to provide hot water to your radiators. It starts with your boiler where cold water is heated to which it can then be circulated to your radiators and/or taps.
Below we have outlined the 5 main components that play a vital role in heating your home and providing hot water when you need it.
The pipework for the central heating system can either be copper/plastic – with copper being the most common. The pipes come in many sizes, from 8mm to 35mm in diameter; with the most common pipe sizes in domestic central heating systems are 23, 22 and 15mm.
The expansion vessel is used in a sealed central heating system to control expansion in the pipes and radiators. As water is heated it expands in volume and this is where the expansion vessel is designed to cope with the expanded water and stops the system bursting from overwhelming pressure.
Expansion Relief Valve
Also part of the ‘sealed’ heating system, the relief valve is designed to operate if there is a problem with the expansion vessel or the system is over pressurised. It’s operation is to remove pressure from the system.
Without the circulation pump the water inside the boiler wouldn’t go anywhere. The pumps purpose is to pump hot water from the boiler to the radiators; and then back to the boiler to be re-heated and then re-circulates again.
The motorised valves are available in two main types, 2 port and 3 port valves. It’s job is to control the flow of heated water to the central heating or hot water system.
In conclusion, the circulation pump pumps water through the pipework, which the flow is controlled by a 2/3 port motorised valve to a point where the expansion vessel does it’s job when the hot water expands too much in the pipes. The expansion relief valve then opens up if the expansion vessel/system gets over pressurised, to prevent the system from bursting.
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