All you need to know about Combi Boilers

Combi boilers are a specific type of condensing boiler that provide a combination of both central heating and hot water, therefore eliminating the need for a separate tank to store water. The provision of an instant, unlimited water supply means combi boilers are easily the most popular boiler type, accounting for over 50% of all new boiler sales within the UK.

The power rating of the combi boiler needs to be matched to your family’s heating requirements. Heating water ‘on demand’, a major advantage of a combi boiler, improves energy efficiency but limits the volume of water available at any moment.

As Combi boilers do not require this hot water storage heat loss can be reduced from previously stored water. As a result combi boilers can be more energy efficient than other boiler types. And because combi boilers do not store hot water they heat water direct from the cold mains supply as you use it, you get the equivalent of a power shower without the need for a pump.

Factors to be considered before you install a combi boiler

However, a series of limiting factors imposed by combi boilers must be considered before installation of a combi boiler. Such limitations include:

• The inability to run multiple showers or baths at the same time
• Lower flow rate for hot water than a stored water system
• Will not work in low water pressure areas
• Flow can be affected if another water outlet is used

For these reasons, a combi boiler is not suitable in all areas and a site survey is often required to confirm the suitability of the water supply.