System Boilers

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 closed circuit.

In this type of heating system, a system boiler connects to a storage cylinder that provides the domestic hot water. As the heating system is sealed it requires no tank in the loft space. When coupled with a mains pressure hot water storage cylinder (known as an invented cylinder), it is well suited to properties with multiple bathrooms. In this configuration, 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. Always seek advice from your Gas Safe Registered engineer.

Model Name Description Solar Compatible
evolve S An evolutionary step in gas boilers Yes
Vision S Feature rich kitchen cupboard fit boiler Yes

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