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Best boilers 2024: Which? Best Buys and expert advice




Combi, heat-only and system boilers

There are typically three types of gas boiler to choose from: combination (combi), heat-only (also called conventional or regular) and system boilers.

  • Combi boilers provide hot water on demand. Best suited for small flats or homes, with low water demands (eg one bathroom).

  • Heat-only (regular) boilers require a cold water feed tank and hot water storage tank, usually installed in the loft. Best suited for larger homes with a high water demand (eg multiple bathrooms being used at the same time).

  • System boilers are like regular boilers, but don't require a cold water feed tank and have more parts built into the boiler body. Best suited for larger homes with poor water pressure and a high water demand.

Your heating engineer will be able to talk you through the different types and make a recommendation to suit your needs. 

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