What is a system boiler?

 

A system boiler heats your central heating system directly and produces hot water for your cylinder. An example of a central heating and hot water system layout using a system boiler with an open-vented hot water cylinder:

 

An example of a central heating and hot water system layout using a system boiler with a pressurised unvented hot water cylinder:

A system boiler, just like a regular (conventional) boiler works on the principle of stored hot water. However, a system boiler differs from a regular boiler in some important respects. Firstly, many of the major individual components of the heating and hot water system are built into a system boiler, which means that installation is quicker, neater, easier and more efficient. Secondly, the hot water is pumped from the system boiler through the heating system to the radiators and hot water cylinder, resulting in a fast response and more economical running costs. The system boiler removes the need for a feed and expansion cistern.

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