Best Boiler for a 3 Bedroom House in the UK

James Elston
Written by James Elston
Updated on 21st September 2023
Posted on 20th September 2023
Topic: Boiler Advice
Best Boiler for a 3 Bedroom House in the UK

Which is the best boiler for a 3 bedroom house in the UK, prices & where to buy one

viessmann vitoden 050-w 30kw combi boiler for 3 bedroom house

Choosing the best combi boiler for your house isn’t an easy task. With such a large number of new boiler models and brands on the market, it can quickly become overwhelming to choose the right fit for your home.

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Worry no more – here at Boiler Central, we’re here to take away the stress with this handy guide to choosing the best combi boiler for your 3-bed house and how much a new boiler costs.

Video: What is the best boiler for a 3 bedroom house?

All you need to know about which boiler is best for a 3 bedroom house can be found in this video.

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Which type of boiler is best for a medium sized house?

combi boiler

Most houses in the UK have about 2-3 bedrooms. A key factor in deciding what boiler you’ll need to install is considering the number of bathrooms your house has.

For a medium-sized house, which generally has about 1 or 2 bathrooms, we recommend a standard combi boiler.

If your house has three bathrooms or more, you’d be better off installing a system boiler or a conventional boiler, as these will be able to provide more hot water at once.

The key difference between these and a combi boiler is that they have a hot water cylinder to store hot water.

Best boilers for a 3 bedroom house in the UK

semi detached house

Combi boilers, however, have no separate hot water cylinder and have all the parts needed to heat your home inside of the boiler.

This is one reason why this boiler type is popular for medium-sized houses; it saves space.

Another reason why combi boilers are so popular is their energy efficiency rating. Modern boilers have an efficiency rating of 94%, which means that for every £100 you spend on heating, an actual £94 goes directly towards heat. Only about £6 is lost in the heating process.

Every boiler loses some heat in the form of waste gases but combi boilers are highly efficient compared to regular, older models. Installing a combi boiler could really help you save money on your heating bill.

Why are combi boilers best for 3 bed homes?

no hot water tank

Not only are combi boilers efficient, but they are also perfectly suitable to cater for 3-bedroom houses.

On a cold winter day, you would generally need about 4kW to 8kW, depending on how old and well insulated your house is. On warmer days, this would be around 1kW to 2 kW.

Generally, combi boilers have an output of about 24kW to 38kW for hot water and about 18kW for heating. This perfectly suits the needs of anyone or two-bathroom house.

Note that a combi boiler wouldn’t be sufficient for a house with more than two bathrooms. If you have more bathrooms than this, choose a model that suits your hot water requirements, such as a system boiler.

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The best combi boilers for a 3 bedroom house

No matter what model you choose, you can rest assured that all modern boilers are built to be as efficient as possible.

However, there’s still a lot of variety to choose from so here is a list of the best boilers for a 3-bedroom house. To help we have also listed the boilers in order of which we believe is the best combi boiler too.

Have a smaller home? check out the best boilers for 2 bedroom house here

Best combi boiler for 3 bedroom homes

Viessmann 050 30kW combi boiler


The Viessmann Vitodens 050-w gas condensing combi boiler is a great compact boiler. It is equipped with the Viessman patented Matrix Plus Burner and the stainless steel Inox-Radial heat exchanger, making this a very durable and efficient model with low emission values.

viessmann vitoden 050-w 30kw combi boiler for 3 bedroom house

The Viessmann Vitodens has wifi available inside, meaning it can be controlled through not only the LCD touchscreen but also by the ViCare App.

Also, now a hydrogen ready boiler to 20%, you can get 12 years warranty exclusively with Boiler Central, therefore this boiler is futureproofed.

With its 30kW output and perfect for kitchen cupboards, it’s is a good fit for a small or medium-sized house with 1, 2, or 3-bedrooms.


  • Output: Central heating output of 29.6kW.
  • Ultra-compact: Dimensions of 700 x 300 x 400.
  • Warranty: Comes with a warranty period of 7 years when installed by a trained engineer.
  • Easy to use: Uses WiFi inside and a touchscreen display.
  • Instantly hot water: No waiting around for heat!

Why choose this boiler?

The Viessmann Vitodens is a boiler with a great price/performance ratio. It’s a reliable, compact, and quiet combi boiler that’ll provide sufficient heating for your three-bedroom house.

The Viessmann Vitodens comes with 7 years of warranty – but you can now get 12 years of warranty if you purchase through Boiler Central including full boiler installation.

Worcester 4000 30kW combi boiler


The Worcester Bosch Greenstar 4000 is a great fit for small or medium-sized houses. We would advise installing this boiler in a house with one bathroom. With its contemporary, stylish design, and its compact size (724* x 400 x 310), it’ll seamlessly blend into your home.

worcester bosch 4000 30kw combi boiler for 3 bedroom house

This combi boiler has a wide power range, meaning your gas usage will be considerably lower.

With a space heating energy efficiency of 94% and a water heating energy efficiency of 85%, your energy bills will be greatly reduced.


  • Output: Central heating output of 24 kW.
  • Flow rate: Hot water flow rate of 10.8 litres per minute.
  • Warranty: A warranty period of 10 years when installed by a Worcester accredited installer.
  • Compact size: This boiler has dimensions of 724 x 400 x 310.
  • Easy to use: Comes with a great full-colour display.
  • Instantly hot water: Perfect for cold mornings.

Why choose this boiler?

If you have a 3-bedroom house, this user-friendly and efficient boiler is surely a great option. While this is a fairly new boiler in the Worcester Bosch assortment, it’s sure to become a classic!

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Alpha E-Tec 33kW combi boiler


The Alpha E-Tec 33kW is ideal for small and medium-sized homes. It is Alpha’s smallest boiler yet and with its 712x440x255 dimensions, it can easily fit in a kitchen cupboard.

alpha e-tec 33 kw combi boiler for 3 bedroom house

This durable condensing combi gas boiler has an efficiency of 93%, making sure it’ll reduce your energy bill.

Fitted with a stainless steel heat exchanger and a high-efficiency Grundfos pump, this boiler will effectively heat any medium-sized and larger home.


  • Output: Central heating output of 29,7kW, and a hot water output of 32 kW.
  • Warranty: 7-year warranty.
  • Stainless steel heat exchanger: Keeps your boiler in tip-top shape for longer.
  • High-efficiency Grundfos pump: Promises high-quality performance.

Why choose this boiler?

If you have a smaller house with less storage space, this boiler is perfect for you. It can easily be installed in a cupboard, while it is able to thoroughly and quickly heat your home.

Ideal Logic C30 combi boiler


The Ideal Logic Combi gas boiler is Ideal’s best-selling boiler. With an efficiency rating of 94%, it’s a very economical and environmentally-friendly option.

ideal logic c30 combi boiler for 3 bedroom house

It comes with a 5-year warranty, which is significantly lower than the other boilers listed.


  • Output: Hot water output of 30.3 kW, and a central heating output of 24.2 kW.
  • Hot water on demand: Instant warmth on winter nights.
  • Compact size: Dimensions of 700 x 395x 278.
  • Easy-to-use: Colour screen is quick to get the hang of.
  • Warranty: 5-year warranty.

Why choose this boiler?

This combi boiler provides great value for money for your 3-bed house. It’s part of Ideal’s ErP range, which means it is designed to be environmentally friendly. So if you are looking for a cost-effective and green option, this is the boiler for you!

How to choose the best boiler for your home

check list

When choosing your boiler replacement, it’s important to keep some factors in mind, for example, the number of bathrooms it’ll have to provide heat for, or the space you have available to get your boiler installed.

All of the boilers listed above have a great reputation and are highly efficient, making sure you won’t pay too much for keeping your 3-bedroom house warm.

o matter which one you choose, you can’t go wrong as these are some of the best combi boilers on the market.

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Best boilers for homes with 3 bedrooms – Conclusion

In the end, choosing the best boiler for a 3-bedroom house isn’t as impossible as it seems.

There are so many great boiler brands competing in this market – and they all produce high-quality boilers that’ll surely keep your 3-bed house comfortable and warm. Browse our range at Boiler Central and get your boiler quotes now – you’re sure to find the boiler that’s right for you in no time!


How many kilowatts do I need for a 3 bedroom house boiler?


The average kW you need for a 3-bedroom house is lower than you might think. On a cold winter day, this would be about 4 to 8 kW.

If your house is newer and better insulated, this will be lower and vice versa. For a warmer day, for example during spring or autumn, your house would need about 1-2 kW.

Combi boilers have a kW output of about 24kW up until 38kW for hot water production. For heating, this is about 18kW. This is more than enough to heat your 3-bedroom home and provide enough hot water.

Can a combi boiler be used in a large house?

We advise installing a combi boiler in a 3-bedroom house with 1 or maximum 2 bathrooms. For a larger house with multiple bathrooms, there are other more suitable boilers, such as regular boilers or system boilers.

Where can I get an accurate quote for a new boiler?

Right here at Boiler Central! Simply tell us what fuel your current boiler uses, then input your details to get your quote! It takes less than 2 minutes, and we provide next-day nationwide coverage – so you’ll have your new boiler in no time at all! You can even get accepted for boilers on finance online too in minutes.

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Written by
James Elston
James Elston Director Of Boiler Central
Posted on: 20th September 2023
Topic: Boiler Advice

James Elston is our resident boiler replacement and heating expert here at Boiler Central. With over 20 years experience in the boiler installation industry, James ensures that he knows everything there is about our Gas Safe boiler installations, energy saving and home heating solutions. This can be from simply procuring the latest best combi boilers, to reviewing and ensuring that Boiler Central maintains the highest standards across our boiler installation company.

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