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Best Boiler for a 4-Bedroom House: Combi, System & Regular
What is the best boiler for a 4 bedroom house? Whether you are looking for a combi, regular or system boiler, you’ll need to get the right output size for your home. In this article we’ll cover what size boiler you will need, and help you to decide which boiler type is best suited to your 4 bedroom home.
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What size boiler do you need for a 4-bed house?
The size of your home will directly affect the size of the boiler you’ll require. This does not mean that you’ll need a boiler that takes up a lot of space, however. When referring to boiler size throughout this article, we will actually be focusing on its output size in kilowatts (kW).
How many kW boiler for a 4-bedroom house?
While there is no single correct answer for which size of boiler is best for a 4 bedroom house, there are some simple calculations we can use to provide a decent estimate. The size of the boiler you require does not depend on the number of bedrooms you have. It is actually dictated by the number of radiators within your home.
A good rule to follow when calculating what output size a boiler will need to be to heat your home effectively is to allow 2kW for each radiator in your home. This will give you a good idea of what kind of boiler will be best suited to your home. For example: A home with 20 radiators will require a boiler with a central heating output of around 40kW.
The only way to find out exactly which boiler will be best for your 4 bedroom home is by getting expert advice from a professional installer. However, finding the right installer can prove to be difficult itself. Not only do you need to find boiler installers near you, but you also need to vet them, and compare several quotes to ensure you aren’t overcharged.
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What boiler is suited for your 4-bedroom-house?
As the average 4 bedroom house has between 10 and 15 radiators, you will most likely require a boiler with an output rating of around 20 to 30 kW. You will also need to take the number of bathrooms into account as well. For a bit more information on which type of boiler will be best suited to your home, check the sections below for each different boiler type.
What is the best combi boiler for a 4-bed house?
A combi boiler is suitable for a 4 bedroom house, so long as it doesn’t have too much demand for hot running water. If your home has more than 2 bathrooms, you may find that even the best combi boilers will struggle to meet your hot water needs.
If your home has 2 bathrooms or fewer though, a combi boiler could be a great choice. Here are the top 3 boilers with output ratings between 20 and 30kW.
Vaillant ecoTEC Plus combi boiler
The ecoTEC Plus combi boiler is available in output sizes ranging from 25kW to 38 kW. This makes it more than capable of heating a 4 bedroom home effectively and efficiently.
It has the following key features too:
- Rapid hot water delivery.
- Two-stage frost protection (allowing for loft or garage installation).
- Can be used as part of a hybrid system with an air source heat pump system.
- Compatible with Vaillant smart controls.
Viessmann Vitodens 200-W combi boiler
With a central heating output of between 25 and 32kW, the Vitodens 200-W combi boiler is perfect for heating a 4 bedroom home.
It also has a number of key features which we’ve listed below:
- Wi-Fi integration to allow for control from anywhere via an app.
- Capable of attaining 98% efficiency.
- Quiet operation.
- Winner of Which? Best Buy 2021.
Worcester Bosch Greenstar 8000 combi boiler
The Greenstar 8000 is not only available in output ranges of 30 to 35kW, it is also available in 2 high gloss colours (black or white). This means it can easily heat a 4 bedroom house and look good doing it.
It has the following key features:
- Robust and lightweight design.
- Intelligent filling system.
- Wireless connectivity.
- LPG (liquified petroleum gas) compatible.
What size combi boiler do I need?
For a 4-bedroom house you will need an 18kW to 43kW combi boiler depending on how many radiators you have.
| Number of bedrooms | Number of radiators | Recommended size |
|---|---|---|
| 1 | 1 to 6 | 18 to 15kW |
| 2 | 6 to 9 | 15 to 22kW |
| 3 | 9 to 12 | 22 to 30kW |
| 4 | 12 to 15 | 30 to 35kW |
| 5 or more | 15 to 20 | 35 to 43kW |
What is the best system boiler for a 4-bedroom house?
System boilers can be suitable for a 4 bedroom house with any level of hot water demand, so long as they are installed alongside a big enough hot water cylinder. They take up less room than a regular boiler, as they draw water directly from the mains with no need for a feed tank in the loft. We’ve provided our top 3 system boiler picks below:
Ideal Logic Max system boiler
Available in output ratings of between 24 and 30kW, the Logic Max system boiler is perfectly suited to heating a property with 4 bedrooms and several bathrooms, depending on the size of hot water cylinder it is paired with.
Some of its key features are:
- Magnetic system filter which lengthens the life of the boiler.
- Ready to run on a 20% hydrogen blend.
- Scratch resistant casing.
- Built-in frost protection.
Baxi Megaflo system boiler
A great choice for homes with hot water, the Baxi Megaflo is available in a range of output sizes up to 32kW. It is compatible with the Megaflo Eco cylinder which can be used to provide a large supply of hot running water throughout your home.
Key features:
- Internal components are made from top quality brass.
- 7 year warranty as standard.
- Easy to install and service.
- Compact design.
Viessmann Vitodens 200-W system boiler
As well as being available as a combi boiler, the Vitodens 200-W can also be used as a system boiler. It is available in a 25kW and 32kW model, making it ideal for a home with 4 bedrooms. When it is combined with a hot water cylinder, the vitodens 200-W can easily provide sufficient hot water for homes with multiple bathrooms.
Key features:
- Wi-Fi integration to allow for control from anywhere via an app.
- Capable of attaining 98% efficiency.
- Quiet operation.
- Winner of Which? Best Buy 2021.
What is the best regular boiler for a 4-bed house?
As regular boilers combine with a hot water cylinder to provide hot running water, they are suitable for use in any 4 bedroom home with any amount of bathrooms. However, they do require a feed tank in the loft to provide them with water, which means they can take up a lot of space. We would only recommend replacing an existing regular boiler with a new one.
Here are the top 3 regular boilers for a 4 bedroom house:
Worcester Bosch Greenstar 8000 regular boiler
Greenstar 8000 regular boilers are only available in the high gloss white variant. However, they are available in a wide range of output sizes from 30 to 50kW too. This means that they can easily heat a 4 bedroom property, and could even heat a home with more than 25 radiators if required.
Key features:
- Robust and lightweight design.
- Intelligent filling system.
- Wireless connectivity.
- LPG (liquified petroleum gas) compatible.
Vaillant ecoTEC Plus regular boiler
The ecoTEC Plus regular boilers from Vaillant are available in outputs that go up to a maximum of 35kW. This makes them suitable for use in houses with 4 bedrooms or up to 18 radiators.
It includes the following key features:
- Rapid hot water delivery.
- Two-stage frost protection (allowing for loft or garage installation).
- Can be used as part of a hybrid system with an air source heat pump.
- Compatible with Vaillant smart controls.
Ideal Logic Max Heat regular boiler
With a maximum output range of 30kW, Ideal Logic Max Heat boilers are easily capable of heating a 4 bedroom home. They are easy to use too, with a large digital colour display.
Other key features include:
- 10 year warranty as standard.
- Built in frost protection.
- System filter included.
- Compact design.
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Nick has a wide range of experience writing about conventional and renewable heating solutions. As well as writing articles for GreenMatch, he also helps in the production of Youtube videos.
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