Combi boilers

Combi boiler

Combi boilers explained - 1:15

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Combi, or combination boilers, are the UK’s most popular type of boiler.

They provide heat to 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’s no need to store water, so 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’re using more than one tap at the same time, the flow of hot water can be reduced, meaning they’re not always suitable for bigger homes with several bathrooms.

If you think a combi boiler is the right option for you, book an appointment with one of our expert Heating Advisers who can assess your heating needs and give you a quote.

If you’re happy with our quote, they can arrange an installation date that’s convenient for you.

Visit our website to find out more about boilers.

Or take a look at our other videos to find out more.

Combi boilers explained

  • Combi boilers are the UK’s most popular type of boiler.
  • Hot water for your taps and central heating system is supplied directly from the boiler unit.
  • Ideal for smaller homes and homes with one bathroom.

Benefits

  • Provides limitless hot water on demand.
  • Can be an economical option, as combi boilers only heat the water you use.
  • A great space-saving solution with no need for a separate cold water tank or hot water cylinder.
  • Installation may be quicker as there are fewer parts in a combi central heating system.

Considerations

  • Depending on your mains water pressure, the flow of hot water could be reduced if you’re using more than one tap at the same time.
  • Water can sometimes take a few seconds to heat up.

More useful information


We have offers and discounts available for a limited time only.

Find out how much you could save with a new boiler.


We have a range of boilers to suit your home.

Reasons to choose British Gas

We guarantee a fixed price

When our Heating Advisors quotes a price, we guarantee it won’t increase even if there’s unexpected work to do.

Boiler cost calculator

Free aftercare included


This includes service and repairs for your boiler, controls and central heating system for one year.

Latest offers

Priority installation dates

If you’re without heating or hot water, we could start installing a new boiler as early as the next day**.

Book an appointment

** Limited service applies during public holidays and exceptional peak demand. An additional charge may apply where weekend installations are requested.

Your home is clean and safe

Our Engineers leave your home neat and tidy and will arrange the safe disposal of all waste.

Step by step guide

* 5008 respondents between 1st July - 31st July 2014.