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A system boiler is a boiler that is installed on a sealed central heating system, as the word suggests it is not open to atmospheric pressure and the system is kept with a sealed circuit.

In this type of heating system, a system boiler connects to a water cylinder that provides the domestic hot water and central heating. As the heating system is sealed it maintains the water pressure and as such a system boiler is more suited to properties with multiple bathrooms, because good flow rates can be maintained if more than one domestic hot water outlet is in use at the same time.

System boilers are also compatible with Solar thermal, therefore if you currently have a system boiler, adding a Solar thermal system can be fairly straightforward.

A system boiler is an ideal boiler if:

  • You want to replace an existing system boiler and are happy with the performance your system boiler provides
  • You have more than one bathroom in your property
  • Your mains water pressure is low
  • You have a regular boiler and you want to remove the feed and expansion tanks in your loft space
     
 

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