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1,484 reviews

Which is the Best Boiler for a Large 5 Bedroom House?

Adam Cherry
By: Adam Cherry
Updated: 3rd May 2022

Which is the Best Boiler for a Large 5 Bedroom House?
A large house needs a powerful boiler.
More often than not, the best boiler for a large 5 bedroom house will be a system or regular boiler. This is because they store hot water in a cylinder which your home will need if it has 2 or more bathrooms.

However, there are also high power combi boilers that can heat your home effectively, if you have 1-2 bathrooms alongside your 5 bedrooms.

That's why we've compared the best of each different boiler type. If you’re not sure which type of boiler you need then we can help...

Combi, system or regular?

Blink
Combi boilers are best suited to homes with 1 bathroom. This is because a combi heats water on demand (without storing it), which can weaken the flow of water if more than one person wants a bath or shower at the same time. They can sometimes be suitable for homes with 2 bathrooms however, if the output rating (a measurement of the boiler’s power and also known as boiler size) is high enough.

Homes with 2 or more bathrooms should consider a system boiler or a regular boiler, as these boilers store hot water in a cylinder. This means there’s more hot water to go around.

You should only consider a new regular boiler if you already have one installed. This is because they are complex heating systems with the need for additional water feed tanks in the loft and extra pipe work, which will all increase your installation costs.

A system boiler is a modern version of the regular boiler, as they take water from the mains (rather than a tank in the loft). Changing from a regular to a system boiler would help modernise your heating system and free up some loft space.

Comparing boilers for a large house

When choosing a boiler there are several things you need to consider.

Efficiency

All modern boilers are highly efficient. This is thanks to condensing technology which means they turn more fuel into heat for your home and hot water.

All boilers are given an efficiency rating on an ABC banding scale (with A being the most efficient band), this is known as the ErP rating. Most new boilers will be A-rated, but it is also worth checking their efficiency rating out of 100%. The closer they are to 100%, the lower your bills will be.

Learn more about boiler efficiency.

Sizing (output)

Boiler Size
When we talk about boiler sizing, we’re talking about its power. This is known as the output rating and is measured in kilowatts (kW). Combi boilers have two output ratings - one for central heating (CH) and another for domestic hot water (DHW). Regular and system boilers only have one output rating, as the domestic hot water is taken directly from the hot water cylinder.

Warranty/Guarantee

Each different boiler manufacturer provides a warranty/guarantee for their boilers. What these include, how long they last for, and whether they are standard or extended, differs by manufacturer. Some manufacturers provide different warranties for different boilers in their range.

If you want to ensure peace of mind for as long as possible, you'll want a boiler with a nice long warranty.

Price

The cost of a new boiler consists of 2 things: The cost of the boiler and the cost of the installation. When comparing boilers, there can be a big difference between their prices. While this shouldn't be your only deciding factor when choosing a boiler, if you can save a decent amount of money upfront, it's definitely worth considering.

Best combi boiler for a large house

Combi boilers are not commonly considered to be powerful enough for use within a large house. However, there are several large capacity combi boilers available on the market. To save you some time and effort, we've provided our top 3 picks below:

Worcester Bosch Greenstar 8000 Life 50

Worcester Bosch's most powerful boiler in their range, the Greenstar Life 50 is both compact and highly efficient. Its output ratings make it suitable for a home with around 15 radiators, 2 bathrooms and an ensuite. It comes with a 5 year warranty as standard that can be extended to 12 years.
Find out more about the Worcester Bosch Greenstar 8000 Life 50

Ideal Vogue Max C40

The Ideal Vogue Max C40 is best suited to homes with around 15 radiators and 2 bathrooms. It comes with a 10 year warranty as standard that can be extended to 12 years. The C40 has also been designed for quick and easy installation which could help to reduce labour costs.
Find out more about the Ideal Vogue Max C40

Vaillant ecoTEC Plus 938

This highly efficient combi gas boiler comes with many features and benefits. One of these features is the integrated hot water storage device which can provide hot running water in 5 seconds, and deliver up to 20 litres of hot water per minute. It comes with a 5 year warranty as standard that can be extended to 7-10 years.
Find out more about the Vaillant ecoTEC Plus 938

To compare these boilers against each other in more detail and make the right choice for your home, you can use our boiler comparison tool.

Best system boiler for a large house

For larger houses with multiple bathrooms, system boilers are the best option. Especially if you already have space for a hot water cylinder. You can find our top 3 picks below:

Vaillant ecoTEC Plus 630

This system boiler has a high efficiency rating of 94%. It's suitable for homes with up to 20 radiators and there’s a more powerful 37kW unit available for even larger properties. The ecoTEC Plus 630 comes with a 5 year warranty as standard which can be extended to a maximum of 10 years.
Find out more about the Vaillant ecoTEC Plus 630

Ideal Vogue Max S32

The Vogue Max S32 system boiler comes with an extensive 10 year warranty as standard which can be extended to 12 years. It has an efficiency rating of 93%, and is compact enough to install inside a cupboard. It is suitable for homes with 15 – 20 radiators.
Find out more about the Vaillant ecoTEC Plus 630

Baxi Platinum Plus 32

Well suited to homes with 15 – 20 radiators, this system boiler includes an Adey Micro2 magnetic filter which is designed to catch debris within the system and prevent it from causing a blockage. The Baxi Platinum Plus 32 comes with a 10 year warranty as standard.
Find out more about the

System boilers must be connected to an unvented hot water cylinder to provide hot running water. You can find out more about unvented cylinders here: Vented vs Unvented Hot Water Cylinders

Best regular boiler for a large house

If you already have a regular boiler installed in your home, you may want to replace it with a similar model. Otherwise, you'll want to install a system or combi boiler. Here are our top 3 regular boiler picks:

Ideal Logic Max Heat H30

Well suited to properties with up to 20 radiators, this highly efficient boiler sports a large digital display for ease of use, and comes with a 10 year warranty as standard which can be extended to 12 years.
Find out more about the Ideal Logic Max Heat H30

Worcester Bosch Greenstar 8000 Life 35

With an efficiency rating of 94%, the Greenstar 8000 Life is one of the most energy efficient regular boilers on the market. It comes with a 5 year warranty as standard which can be extended to 12 years, and has a full colour LCD display for simple navigation and control.
Find out more about the Worcester Bosch Greenstar 8000 Life 35

Vaillant ecoTEC plus 430

Healthy Boiler Warranty
This highly efficient boiler has two-stage frost protection which allows for it to be installed in colder rooms such as a garage or in the attic, and still run effectively, even in the depths of winter. It comes with a 5 year warranty as standard which can be extended to a maximum of 10 years.
Find out more about the Vaillant ecoTEC plus 430

As most regular boilers will require a water supply from a tank in the attic, they will need to be coupled with a vented hot water storage cylinder to allow for hot running water. You can find out more about vented cylinders here: Vented vs Unvented Hot Water Cylinders

Getting the best price

Whether you decide to get a combi, system or regular boiler for a large property, you will always want to get it installed for the best price. To ensure you don't overpay, we highly recommend getting comparison quotes from different heating engineers in your area. Fortunately, we can help you with that! Simply click the link below and provide some basic details about your boiler needs, and we'll get you free no-obligation comparison quotes from up to 3 heating engineers in your area.



Adam Cherry

About the author

Adam Cherry

Adam is our resident home heating expert. His experience and advice has helped millions of customers improve the efficiency of their homes and save money.

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