A couple playing with a child in their 3 bed house, everyone is smiling a laughing

Which boiler is best for a 3 bedroom house?

Whether you live in a 3-bed bungalow or a 3-bedroom terraced house, choosing a boiler that is able to meet your needs is essential. There is an abundance of boilers available on the market, so we understand that choosing the right one could be a difficult task. However, here at HomeServe, it’s our goal to ensure that you get the right boiler for your needs. Read on to find out all you should need to know about boilers for 3-bed homes.


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Choosing the best boiler for a 3 bed house


It’s essential for your boiler to be an adequate size for your central heating demands. A boiler with too much power could cause you to have unnecessarily high energy bills, whilst a boiler with an output that is too low could fail to provide you with the heating and hot-water you need.

At HomeServe, we aim to provide our customers with a boiler that not only has the power to deliver effective central heating to their home, but also has the efficiency to help them save on their energy bills*. We install heating systems from some of the leading brands in the industry, so you can rest assured knowing that with us, you’re in safe hands.


What size boiler is best and why kW output is important


The main thing that you’ll need to consider when debating boiler size is the kW output needed for your household. kW output can be defined as a measurement of a boiler’s power and its ability to cope with your central heating needs. Generally, the higher the demand for heating and hot-water, the higher the kW output needs to be. The kW output required for your home tends to relate to the number of bathrooms and radiators present.

The kW output needed for your home will also be influenced by the type of boiler you choose.


There are 3 main boiler types:



The kW outputs for these boiler types are measured differently. Here's some more information on these boiler types along with estimated guides of their kW output ranges:


Combi boilers


These systems are designed to be highly efficient sources of central heating. Capable to delivering both hot-water and heating all through one compact system, you could enhance the levels of efficiency and save space in your home with a combi boiler. Take a look at our combi boiler page to find out more.

To help you get a better understanding of combi boiler kW outputs, we’ve created the following estimated guide:

24-27kW 1-2 bedroom, 10 radiators, 1 bathroom
28-34kW 3-4 bedroom, 15 radiators, 1-2 bathroom
35-42kW 4+ bedroom, 20 radiators, 2+ bathroom



Conventional boilers


Also known as regular or heat only boilers, these systems are regarded as a traditional form of central heating. Using an additional hot-water tank and cold-water cylinder, these systems store water and deliver it to your taps and radiators when needed. Visit our page on conventional boilers to find out more about this boiler type.


System boilers


System boilers are designed to provide heating and hot water, similarly to a conventional boiler, however they do not require a water storage tank. They are normally located in the loft space. You can find out more about this boiler type by visiting our system boiler page.

To help you select a suitable size for your 3-bed home, here’s an estimated guide of both conventional and system boiler kW outputs:


12-15kW 1-3 bedrooms, 1 bathroom
18-24kW 3-4 bedrooms, 1-2 bathroom
30kW+ 4+ bedrooms, 2+ bathroom



Why not try our free online quote tool?


To get a free quote and a personalised recommendation for a boiler that could suit your home heating needs, try our free online quote tool today. Simply answer a few questions about your home and within just a few moments, you could receive your free quote.


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A range of options for your new boiler


Now that you have a better idea of the size of boiler that your home should require, you can now start to think about which boiler model is most suitable. There are plenty of boilers available on the market, and we’re here to help you find the right one for your needs.

To help make paying for your new boiler as easy as possible, we also seek to provide access to a range of flexible finance options**. Visit our Access to Finance page to find out more.


To help you select a boiler for your home, we’ve outlined what we believe to be some of the most suitable boilers for 3-bed homes below.


  1. Worcester Bosch Greenstar 30i Combi
  2. Ideal Logic C30 Combi
  3. Ideal Vogue C32 Combi
  4. Ideal Heat H18 Heat-only
  5. Worcester Bosch Greenstar 18Ri Heat-only 
  6. Worcester Bosch Greenstar 8000 Life 30kW Combi 
  7. Worcester Bosch Greenstar 8000 Style 30 kW Combi
  8. Intergas Xclusive 30kW Combi
  9. Intergas Eco RF 24 Heat-only
  10. Vaillant EcoTec Plus 832 Combi


Boiler warranties


When you get a new boiler installed with us, you also get peace of mind in knowing that your boiler could be covered for years to come***. All our boilers come with up to 10-years manufacturer-backed warranty to provide you with an added sense of security. You can rest easy knowing that in the event of a breakdown or fault with your new system, your manufacturer could provide you with a repair or replacement at no added cost***.


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Is your home a different size? Check out our similar guides:


Recommended boiler sizes are estimates only and should are not a substitute for expert engineer advice.

*Source: energysavingtrust.org.uk. Saving calculated when replacing G-rated with A-rated boiler in a semi-detached house.

**Credit is subject to status, affordability assessment and credit checks. Interest-free credit is available over 2 years on all boiler makes. Credit is also available across 36-120 months at 9.9% APR. Finance can be taken out with or without deposit and capital payments can be made at any time to reduce your loan.

***Subject to an annual service at the customer's expense. Warranty extension from 5-years to 7-years or 10-years only available on Worcester Bosch. Warranty extension from 5-years to 10-years available on Ideal Boilers. All warranty extensions subject to an additional charge.



Information and other materials on this website are not intended to constitute professional advice and should not be relied upon. Please see our Terms of Usefor further details.

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