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Last updated: 13 June 2024

Best Boiler for a 3-Bed House: Sizes and Types

Best boiler 3-bed house
  • The best boiler for a 3-bedroom house with one bathroom is a combi boiler with 28-34kW output, while for two bathrooms, a system boiler with 18-26kW output is recommended.
  • The best combi boiler for a 3-bed house is the Worcester Bosch Greenstar 8000 Lifestyle 30kW combi boiler.
  • The most efficient boiler for a 3-bed house is the Viessmann Vitodens 200-W 11kW system boiler.

In virtually all cases, the best boiler for a 3-bed house will be a combi boiler. Having one of those as the main component of your home’s central heating system will ensure a good balance between power, saving space, and convenience.

Of course, you can always consider other boiler types, but combi boilers are the most common and effective solution for houses with up to 3 bedrooms and 1-2 bathrooms. Whichever boiler type you choose, you'll also need to consider the different sizes and models available. So, what is the best boiler for a 3-bed house? You will find the answer in this article.

Has this left you wondering what boiler size you need for a 3-bed house? To simplify the often time-consuming task of finding reputable boiler professionals who can give you expert advice on this, here at GreenMatch we can connect you with up to 3 certified local boiler installers by simply completing our short 30-second online form.

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What size boiler is best for a 3 bed house?

The best boiler for a 3-bedroom house will have an output between 18kW and 34kW. Homes with a single bathroom can utilise a combi boiler of 28-34kW. While those with 2 bathrooms will require a system boiler with 18-26kW.

The best boiler for a 3-bedroom house will need to be powerful enough to meet your home's heating and hot water demands. This means that if you choose either a combi, system boiler or regular boiler, it must have an adequate output size (measured in kilowatts, kW).

If the output size is too low, the boiler will struggle to run your central heating radiators, and the hot water delivered to your showers and taps might not be hot enough. On the other hand, if it is excessively high, you would pay considerably more for your boiler. Therefore, you might unnecessarily spend a lot of money on energy bills, making it no longer the best boiler for a 3-bed house you could find.

Also, the best boiler for a 3-bed 2-bathroom house will need to be more powerful than models designed to supply hot water for just 1 bathroom.

You can watch our short video below to find out how to calculate the right boiler size for a 3-bed house:

Choosing the Right Size Boiler - How to Calculate?

If you own a larger house, check our articles Best Boiler for a 4-Bedroom House and Best Boilers For Large Houses (5-7 bedrooms) to find the combi, system or regular boiler that best meets your needs. For smaller properties, we recommend reading What is the Best Boiler for a Small House?

What size boiler do I need for a 3-bed house?

How many kW boiler for a 3-bedroom house?

What size a boiler should be will depend on the number of radiators within a 3-bedroom house rather than the number of bedrooms. In any case, there is more than one right answer to the question of how many kilowatts (kW) a boiler should be to meet the heating and hot water demand of a 3-bed house.

One effective method to address the question "How many kW does a boiler for a 3-bedroom house need?" is to estimate around 2kW for each radiator in your residence. For example, a home with 6 radiators would require a boiler with a central heating (CH) output of approximately 12kW.

Additionally, you must consider that combi boilers need to be more powerful than system and regular boilers to achieve the same result because they don’t store hot water for domestic use. Rather, they heat it and supply it to your hot water outlets on demand. This is why combi’s technical specifications also indicate domestic hot water (DHW) output. 

You can check the table below to get an idea of how many kW a boiler should be for a 3-bedroom house. It is also helpful if you want to compare a combi boiler vs system boiler or a combi vs a regular boiler.

Approximate Boiler Sizes (CH Output)

House Size

Combi Boilers

System Boilers

Regular Boilers

Houses with 6-8 radiators (usually up to 3 bedrooms)

Around 18kW

Around 13kW

Around 13kW

Whilst all these tips and estimates can point you toward the right size, the only way to find out exactly what is the most appropriate boiler size for your 3-bed house is to get expert advice from a professional installer. However, finding the right installer could take hours of your time and effort if you opt to do the research by yourself.

Fortunately, there's an easier way. We can help you with this by quickly connecting you with up to 3 qualified installers in your local area hassle-free. You can then compare their quotes and choose the best price. Click the button below to get your free, non-binding quotes

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What boiler is suited for your 3-bedroom house?

Generally speaking, a combi boiler with a CH output rating of around 18kW is powerful enough for a 3-bedroom home. Similarly, a 13kW system or regular boiler can comfortably heat this type of property.

Regarding your home’s domestic hot water needs, a combi boiler needs a DHW output of around 40kW to meet the demand of a 3-bedroom house that also has 2 bathrooms. If the property has only 1 bathroom, then a lower DHW would be sufficient.

 On the other hand, system and regular boilers need a separate hot water storage cylinder as they don’t provide hot water on demand. Check the table below for estimated cylinder sizes.

Hot Water Cylinders For Different Types of Houses

Bedrooms

Bathrooms

Cylinder Capacity (litres)

1

1

120 – 150

2

1

180

3

2

210

Even though system and regular boilers are suitable options, combis are generally best suited for 3-bedroom houses. As they don’t need external components (e.g. hot water storage cylinders and feed tanks), they can help you save a lot of space around your home. Nevertheless, we recommend a system boiler if your house has more than 2 bathrooms.

After reviewing dozens of models, we created a list of the best boilers for 3-bedroom houses. Below, you will find our 3 top picks for each boiler type. We considered high-quality units manufactured by the most reputable boiler manufacturers in the UK.

The best combi boiler for a 3-bed house

These are our picks for the best combi boilers for a 3-bed house:

Worcester Bosch Greenstar 8000 Lifestyle 30kW combi

Worcester Bosch Greenstar 8000 Lifestyle 30kW combi

These are two premium boiler models: Life and Style. They share all the main features, but the Style model is available in high gloss black or white. It is also more expensive. 

These boilers certainly are among the best combi boilers for a 3-bed house. They include wireless connectivity with the Bosch EasyControl. They are also ready to run on a 20% hydrogen blend. Optionally, you can equip them with an Intelligent Filling System. 

  • Max. CH output: 30kW
  • Max. DHW output: 30.2kW
  • Suitable for: Properties with up to 15 radiators and more than 1 bathroom
  • Efficiency: 94% efficiency and ErP A-rated for heat and hot water
  • Warranty: Up to a 12-year guarantee when installed by a Worcester Accredited Installer
  • Estimated price (Exc. installation): £1,200 (Life), £1,300 (Style)

Vaillant ecoTEC Plus 832

The best combi boiler for a 3-bed house?

Vaillant is one of the leading boiler manufacturers and a great option to consider for a 3-bedroom house, boasting a high efficiency and central heating (CH) output. Moreover, you can trust the reliability of this model as Vaillant offers up to a 10-year warranty. Below we have compiled its main features:

  • Max. CH output: 25.7kW
  • Max. DHW output: 31.8kW
  • Suitable for: Homes with around 10 to 15 radiators and up to two bathrooms.
  • Efficiency: 94% efficiency and ErP A-rated for heat and hot water.
  • Warranty: a standard 5-year warranty which can be extended to up to 10 years.
  • Estimated price (Exc. installation): £1,248

Viessmann Vitodens 100-W 26kw combi

Viessmann Vitodens 100-W 26kw

The Vitodens 100-W is an efficient, compact, and quiet combi boiler suitable for smaller, well-insulated homes. It is also compatible with a 20% hydrogen blend and comes with smart technology that can help you save on energy costs. 

  • Max. CH output: 25kW
  • Max. DHW output: 31.7kW
  • Suitable for: Homes with 10 -15 radiators and up to 2 bathrooms
  • Efficiency: 94% efficiency and ErP A-rated for heat and hot water
  • Warranty: 5-year guarantee with the option to extend by a further 7 years
  • Estimated price (Exc. installation): £1,292

The best system boiler for a 3-bedroom house

Our selection of the best system boiler for a 3-bedroom house includes the following: 

Viessmann Vitodens 200-W 11kW system

Viessmann Vitodens 200-W 11kW system

The Vitodens 200-W is a powerful gas condensing boiler. It is compatible with a 20% hydrogen blend and features quiet operation thanks to its low fan speed. Additionally, it includes an integrated WiFi interface for internet connection and a new environmentally responsible MatriX-Plus burner.

  • Max. CH output: 11kW
  • Suitable for: Perfectly suited to properties with up to 10 radiators.
  • Efficiency: up to 98% efficiency and ErP A-rated for heat
  • Warranty: 10-year warranty option when registered through the Viessmann Installer Portal
  • Estimated price (Exc. installation): £1,344

Worcester Bosch Greenstar 8000 Lifestyle 30kW system

Worcester Bosch Greenstar 8000 Lifestyle 30kW system

As in the case of the combi boiler variant, the Greenstar 8000 Lifestyle 30kW system line has two premium boiler models: Life and Style. They have the same benefits and special features as Greenstar 8000 Lifestyle combis, but, as system boilers, they need storage cylinders to supply hot water to your taps and showers.

  • Max. CH output: 30kW
  • Suitable for: Properties with up to 20 radiators and 2 bathrooms
  • Efficiency: 94% efficiency and ErP A-rated for heat
  • Warranty: Up to a 12-year guarantee when installed by a Worcester Accredited Installer
  • Estimated price (Exc. installation): £1,236 (Life), £1,317 (Style)

Ideal Vogue Max S15

Ideal Vogue Max S15

Ideal Vogue Max system boilers are made with premium components and feature a high-quality Ideal System Filter, enhancing efficiency.

  • Max. CH output: 15kW
  • Suitable for: Homes with around 10 radiators
  • Efficiency: 92% efficiency and ErP A-rated for heat
  • Warranty: 10-year warranty, increased to 12 years if installed and serviced by a Max accredited installer
  • Estimated price (Exc. installation): £1,030

The best regular boiler for a 3-bed house

Whilst regular boilers are technically a valid option for a 3-bed home, we recommend installing a new regular boiler only if you already have one of these installed at home. 

They are more space-consuming than system boilers and much more than combis. On the other hand, a like-for-like regular boiler swap is usually cheaper than changing to a different type of boiler.

This is our selection of the best regular boilers for a 3-bed house:

Worcester Bosch Greenstar 8000 Life 30kW regular

Worcester Bosch Greenstar 8000 Life 30kW regular

The Greenstar 8000 Life 30kW regular boiler is a highly reliable condensing regular gas boiler. Besides featuring a modern design, its main unit was designed for compact wall-mounted installation.

  • Max. CH output: 30kW
  • Suitable for: Homes with up to 20 radiators
  • Efficiency: 94% efficiency and ErP A-rated for heat
  • Warranty: 5 years as standard. It can be extended to 12 years when installed by a Worcester Bosch Accredited Installer
  • Estimated price (Exc. installation): £1,255

Vaillant ecoTEC Plus 412

Vaillant ecoTEC Plus 412

This is a high-performance boiler featuring excellent control and efficiency. The main unit is compact enough to fit in a kitchen cupboard. It is compatible with smart controls and smartphone apps such as Vaillant’s vSMART. 

  • Max. CH output: 12.3kW
  • Suitable for: Homes with up to 10 radiators.
  • Efficiency: 94% efficiency and ErP A-rated for heat
  • Warranty: 5-year guarantee as standard, up to 10 years available when you book a Vaillant Advance installer
  • Estimated price (Exc. installation): £805

Ideal Logic Max H12

Ideal Logic Max H12

Ideal Logic Max regular boilers include a high-quality Ideal System Filter, enhancing efficiency, and are manufactured in the UK by a British company, making them more readily available.

  • Max. CH output: 12kW
  • Suitable for: Homes with around 10 radiators and low demand for heating
  • Efficiency: 93% efficiency and ErP A-rated for heat
  • Warranty: 10-year parts and labour warranty available
  • Estimated price (Exc. installation): £885

Find the best boiler for your 3-bedroom house

At GreenMatch, we are committed to helping you navigate the transition to more sustainable ways of heating your home. In this regard, switching to low-carbon systems such as solar panels in the UK, heat pumps, or domestic biomass boilers may be the greenest choice. However, we know that these are expensive —and sometimes prohibitive— alternatives to gas boilers.

If you are not ready yet to switch but still want to make a difference for the environment, consider installing a highly efficient boiler.

New boiler costs for a 3-bed house might be high too; however, by replacing an old gas boiler with a new A-rated combi boiler for example, you could save up to £385 annually on your energy bills for a semi-detached house. It is important to note that savings will depend on various factors, such as the current energy prices and the size and thermal performance of your home.

Are you ready to embark on the journey towards increased energy efficiency, sustainability and annual savings on your energy bills? Luckily, GreenMatch is here to help by sparing you from the pain of spending hours of your time searching for vetted local boiler installers. 

Instead of comparing and calling installers one by one, choose the easy way and take advantage of our free and non-binding service by clicking on the button below. Complete our short 30-second form, and we will connect you with up to 3 local professional boiler installers.

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