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System boiler with Pressurised Hotwater Cylinder

system gas boilerA 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, pump, control valves, pressure vessel, which means that installation is quicker, neater, easier and more efficient.

Secondly, the system boiler removes the need for a feed and expansion cistern which would normally be located in the loft.

The advantages of a System Boiler with Un-Vented Hot Water are:-

  1. High pressure hot and cold water at all outlets.
  2. A powerful shower.
  3. Additional storage space.  No water tanks in the loft and no hot water cylinder in the airing cupboard.
  4. Minimal pipework.
  5. Hot water backup if the unvented cylinder is fitted with an immersion heater.
  6. Good for multi bathroom/shower room installation.
  7. No need for additional shower pumps to boost water pressure.

The dis-advantages are:-

  1. They require a certain amount of water pressure and volume to work correctly.
  2. The water within the radiator system will be higher than a traditional system.

Perfect Heating And Plumbing – System Boiler with Open Vented Hot Water Cylinder - System Boiler


A system boiler heats your central heating system directly and produces hot water for your cylinder.