Combi Boiler Central Heating System Diagram

How a combi boiler works at least a modern combi boiler is.

Combi boiler central heating system diagram. Secondary plate heat exchanger. The central heating portion of a combi is on a pressurised closed loop system heated by the boiler as required. A primary heat exchanger. So if it is lashings of hot water at a forceful pressure you are looking for then this is the system for you.

For domestic hot water the mains supply is fed direct to the boiler. This diagram illustrates how simple the heating system connected to a combi boiler is. For central heating 2. In direct contrast open vent also called regular standard or conventional boilers and system boilers heat water that s stored in a tank.

No external pump no tanks no external expansion vessel no motorised valves and in many cases item 6 is not needed either. Combination boilers have no tanks at all. An automatic bypass valve is fitted inside most combi boilers by the manufacturer these days. Instead they heat water for central heating and domestic hot water as required.

A combination or combi boiler is both a high efficiency water heater and a central heating boiler in a single compact unit. They have two heat exchangers inside them.