What size Combi boiler do i need for my house?


Combi boiler

Combination boiler or combi boilers come being one of the most common types of boilers used in UK for a reason. Unlike the system and conventional units, the combination boilers are designed to be an all in one unit which produces hot water for taps and central heating in order to cut down the use of storage tanks or cylinders, thus occupying the least space required to house the boiler. Additionally on a comparison, the installations are much easier and faster than any other boiler unit.

The combi boilers operates by using the water from the main supply that results in stronger water pressure and ensures that you would never be lacking on hot water again. The modern highly efficient units come, being a stainless steel condensing boiler with an inbuilt heat exchanger that operates in order to serve the customers with hot water immediately.

There are two main reasons behind the combi boilers great and powerful efficiency i.e. these units have high operating efficiency and low internal water volume. This means when in summer days you don’t need space heating you are only paying to heat water which is domestically required. Now that you have a well knowledge about the combi boilers, you might be thinking what size combi boiler do I need for my house?

What size Combi boiler do i need for my house?

Combi boilers come being available in 3 series of sizes ranging from 24-27kW, 28-34kW and 35-45kW.

  • On a rough estimate, the 24kW-27kW range of combi boilers are made to suit the houses and apartments that are comparatively smaller, with up to 10 average size radiators and 1 bathroom.
  • The 28-34kW range of combi boilers is designed and manufactured to be suitable for the medium large size houses and apartments that have up to 15 average size radiators with1 normal size and 1 ensuite bathroom.
  • Whereas, for the large houses that are made to have up to 20 average size radiators and 2 bathrooms, a 35-45kW combi boiler would be installed.

To conclude the above mentioned points, it can be stated that properties with higher demand of hot water would require a boiler with higher kW, which means “the higher the output of the unit, the better the flow rate of hot water would be”.

However, a combi boiler would not be a perfect recommendation if you need your unit to cope with the 2 showers at the same time with hot water because the combi boilers operate to heat water directly from the mains when you turn on the tap. In that case, a system boiler with an unvented cylinder would act as a much stronger recommendation.

We have recommended below some of the top best boiler models depending upon the size of houses.

Flat/1-2 bedroom house – 1 bathroom

§  Worcester Bosch Greenstar 25i

§  Vaillant ecoTec plus 25kW

§  Vitodens 100-W Combi

Semi-detached – 3 bedrooms – 2 bathrooms

§  Greenstar Highflow 440CDi Floor Standing Combi boiler

§  EcoTEC plus 938 storage combi boiler

§  Ideal Logic+ 30kW combination boiler

Detached House/Bungalow – 4+bedrooms – multiple bathrooms

§  Vaillant ecoTEC 835 combination boiler

§  Vitodens 222-F Floor Standing Storage Combi Boiler

§  Worcester Bosch Greenstar 38CDi classic

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