Boilers Types Explained also showing pros & cons for each


Worcester Bosch combi bolier image

Combi (Combination) Boiler

Combi or combination boilers, are the UK’s most popular type of boiler. They provide heat to all your radiators plus limitless hot water on demand by heating water directly from your mains supply. This makes them an economical solution for many households as they only heat the water you use. There is no need to store water meaning you don’t need room in your loft for a cold water tank or space for a hot water cylinder. This often makes them great for smaller homes where space is limited. If you are using more than one tap at the same time, the flow of hot water may be reduced, meaning they are not always suitable for bigger homes with several bathrooms.

    Pros
  • Compact sizes make combi boilers perfect for smaller properties.
  • Ideal where there is little or no loft space.
  • No need for a hot water cylinder allows increased living space.
  • No cold water storage tank frees up a loft for conversion.
  • No risk of loft pipework freezing.
  • Less pipework in the home makes installation typically cheaper.
    Cons
  • Depending on your mains water pressure, the flow of hot water could be reduced when you use more than one tap at the same time.
  • The water can sometimes take a few seconds to heat up.
Worcester Bosch unvented bolier image

System Boiler

System boilers require a cylinder for storing hot water however the major heating and hot water system components are built into the boiler itsel making it quicker and easier to install. In addition there is no need for a tank in the loft, so it can be an option in a home with little or no loft space or where the space is earmarked for a conversion. These boilers are also compatible with solar water heating systems, which deliver environmental benefits as well as lower energy bills.

    Pros
  • Ideal for homes with more than one bathroom.
  • Constant supply of hot water to any number of taps at the same time.
  • No need for a loft tank, freeing up space and eliminating worries about leaks or frost damage.
  • Economical to run.
  • Built-in components makes installation quicker and neater.
    Cons
  • You don't get hot water instantly.
  • Space is required for a hot water cylinder.
  • The amount of hot water is limited to the capacity of the cylinder, so if it runs out you’ll need to wait until it heats up again.



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Worcester Bosch regular bolier image

Regular Boiler

Regular or conventional boilers are the traditional type of boiler, and are still a great solution for many homes. They provide heated water for your radiators and heats up the water in a hot water cylinder ready to use in your home. As long as there is sufficient hot water in the cylinder you can run multiple hot taps at once. This often makes them ideal for families or homes with multiple bathrooms. To avoid having to wait for hot water you can arrange for it to be heated in advance at a time you choose using programmable controls. An immersion heater can also be built into your hot water cylinder as a back-up in case your boiler breaks down. Whilst a feed and expansion tank, normally found in the loft, keeps water levels regulated.

    Pros
  • Can provide hot water to multiple taps at the same time.
  • An electric immersion heater can be fitted to the hot water cylinder as a back-up in case of breakdown.
  • A good option in areas where water pressure is low.
  • Compatible with solar water heating systems for a lower carbon footprint and lower energy costs.
    Cons
  • Space is required for a hot water cylinder and a cold water tank.
  • You will need programmable controls to heat the water in the cylinder so it’s ready when you need it.
  • The amount of hot water is limited to the capacity of the cylinder, so if it runs out you’ll need to wait until it heats up again.