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
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
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
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
§ Vaillant ecoTec
§ Vitodens 100-W
– 3 bedrooms – 2 bathrooms
§ Greenstar Highflow 440CDi Floor
Standing Combi boiler
§ EcoTEC plus 938 storage combi boiler
§ Ideal Logic+ 30kW combination boiler
House/Bungalow – 4+bedrooms – multiple bathrooms
§ Vaillant ecoTEC 835 combination
§ Vitodens 222-F Floor Standing
Storage Combi Boiler
§ Worcester Bosch Greenstar 38CDi