Combi Boiler Central Heating System Diagram

Instead they heat water for central heating and domestic hot water as required. For domestic hot water the mains supply is fed direct to the boiler. For central heating 2.

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No external pump no tanks no external expansion vessel no motorised valves and in many cases item 6 is not needed either.

Combi boiler central heating system diagram.

Secondary plate heat exchanger. An automatic bypass valve is fitted inside most combi boilers by the manufacturer these days. In direct contrast open vent also called regular standard or conventional boilers and system boilers heat water that s stored in a tank. A combination or combi boiler is both a high efficiency water heater and a central heating boiler in a single compact unit.

Central heating system diagram with high pressure boiler this type of system operates at mains water pressure and uses a stored hot water system. Combination boilers have no tanks at all. How a combi boiler works at least a modern combi boiler is. They have two heat exchangers inside them.

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A primary heat exchanger. Combi boilers heat water directly from the mains when you turn on a tap so you won t need a hot water storage cylinder or a cold water storage tank in the roof space.

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