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A combination or 'combi' boiler is both a high efficiency water heater and a central heating boiler in a single compact unit. Combi boilers heat water directly from your water main when you turn on a tap, so you won't need a hot water storage cylinder or a cold water storage tank in the roof space which of course frees up much needed space in your home.
They can also be very cost-effective and energy efficient as water is heated instantly rather than being heated and then stored in a cylinder reducing wasted energy. An added benefit is that hot water is delivered at mains pressure, which means that you could get a powerful shower without the need for a separate pump.

  • Compact sizes make combi boilers perfect for smaller properties
  • Perfect where there is little or no loft space
  • No need for a hot water cylinder which allows increased living space
  • No cold water storage tank frees up loft space for conversion
  • No risk of loft pipework freezing
  • Less pipework in the home makes installation typically cheaper

Combi Diagram

British Gas