What is a Combi Boiler? | Heating & Plumbing Definitions

A Combi Boiler has become increasingly popular in homes throughout the UK as it provides central heating and hot water within the 1 unit, hence the name ‘Combi Boiler’.

It has become an attractive alternative to heat only boilers and system boilers because unlike these boiler systems, a Combi Boiler does not store hot water itself. Hot water is created by the Combi Boiler as water runs through the mains.  This means that there is no requirement to have an external hot water tank elsewhere in your property.


There are lots of Combi Boilers out there


A range of Combi Boilers are manufactured by established brands such as Baxi, Vaillant and Worcester:


Reasons to choose a Combi boiler?

  • Cost: Combi Boilers are very efficient, allowing you to heat both your home and water quickly when you need it. This reduces the need to use the boiler when it is not required. There is also no need to heat up an external water tank, something that can contribute towards saving you money in the long run.
  • Space: Combi Boilers take up less space in the property than standard boilers as there is no requirement for a separate hot water cylinder tank. This makes it a popular choice for residential properties where you can choose to have the single Combi Boiler unit installed in the kitchen, airing cupboard or in the loft.
  • Performance: hot water is powerfully delivered via your taps or shower at mains pressure, helping you to enjoy a power shower. No hot water pump is required.
  • Installation: A lot of time (and therefore money) can be saved when installing a Combi Boiler as only the one unit needs to be installed. Savings can also be made on the amount of piping that needs to be used when installing the boiler, as there is no need to hook the system up to an external water tank located elsewhere in the property.
  • Maintenance: Future maintenance costs are reduced as there is only 1 unit to maintain.


Heat Output & Water Flow Rate:

Before you purchase your new Combi Boiler you need consider factors such as heat output and flow rate to ensure you get the right one. Definitions for each of these are as follows:

  • Heat output: the amount of heat that you need the Combi Boiler to emit is dependent upon a number of factors such as the size of the property, the type of property and the amount of water that the boiler system will be using. Heat output is measured in BTUs (British Thermal Units) and all reputable installers should be able to advise further.
  • Water flow rate: This is the speed at which the water passes through the heat exchanger. The slower the water travels through the heat exchanger, the hotter the water can get.


Buying a Combi Boiler:

A number of variations of Combi Boiler are available to suit most requirements.


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