Combi Boilers

combi boilersCombi Boilers or Combination Boilers are able to distribute both hot water to a sealed heating system, and also a separate supply of hot water instantly directed to taps, baths and showers.

Combi Boilers although good, have both positive and negative features. This type of boiler is not as common as a condensing boiler, and is more popular in smaller properties such as flats. Check out the advantages and disadvantages of this type of boiler below:

Combi Boilers – Advantages

  • Ease of installation. Combination Boilers generally require less time when installing. This is because there are no tanks or pipes in the loft space.
  • Space Saving. Combination Boilers save space, particularly useful in smaller properties. This is because Combi Boilers do not require a hot-water storage cylinder.
  • Economy. Combination Boilers only heat the water that you use.
  • Instant Hot Water. Combination Boilers heat water instantaneously – no waiting for the immersion heater to warm the cylinder.

Combi Boilers – Disadvantages

  • Slower Flow Rate. Combination Boilers generally have a slower hot water flow rate. Therefore filling a bath may be slower than you are used to.

To summarise – Traditionally Combi Boilers have been best suited to properties such as flats or small houses. However, the more modern Combi Boilers we see today have considerably higher flow rates than some of the older versions, including Combi Boilers that now come equipped with built-in hot-water storage.


Chartered Institute Of Plumbing & Heating Engineers