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

Best Boiler for a 5 Bed 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. That's because they store hot water in a cylinder. And you'll be needing a hot water cylinder if you have 2 or more bathrooms.

However, you could get away with a combi boiler if you have 1-2 bathrooms alongside your 5 bedrooms.

So, as well as comparing the best system and regular boilers for a 5 bed house, we've compared a couple of powerful combi boilers too.

Best Combi Boiler for a Large 5 Bedroom House

Best System Boiler for a Large 5 Bedroom House

Best Regular Boiler for a Large 5 Bedroom House

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 – 2 if the output rating (a measurement of the boiler's power) is high enough. 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. Not what you want.

Homes with 2 or more bathrooms should consider a system or regular boiler as they store hot water in a cylinder. In a house with a cylinder, there's plenty of hot water to go around. That's until the cylinder is empty and you'll need to wait for it to fill up again.

So how do you know if you need a system or regular boiler? Well, you should only really install a new regular boiler if you already have one installed – mostly older properties. This is because they're complex heating systems.

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). So a system boiler would modernise your heating system and free up some loft space.

Boiler Type Bathrooms Radiators
Combi 1-2 15-20
Regular 2+ 15-20
System 2+ 15-20

    Boiler-Comparison-Tool
    Boiler-Comparison-Tool

Best Combi: Baxi vs Worcester Bosch

Baxi and Worcester Bosch are leading boiler manufacturers who both offer a range of reliable combi boilers. These models are particularly well suited to homes with up to 20 radiators and 2 bathrooms.

Boiler Features Baxi 800 Platinum+ 40 Worcester Bosch Greenstar 8000 Life 50
Central Heating Output Rating 34.4 kW 35 kW
Domestic Hot Water Output Rating 40 kW 48.9 kW
Seasonal Space Heating Efficiency Rating 93% 94%
ErP Rating A Heat, A Water A Heat, A Water
Standard Warranty / Guarantee 10 year warranty 5 year guarantee
Max. Extended Warranty / Guarantee 12 Years
Mounting Wall Wall
Dimensions in mm (HxWxD) 780 x 450 x 345 780 x 440 x 365
Potential Cost £1,307 £2,100
Typical Installation Costs £500 – £1,000 £500 – £1,000

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.

These are both ErP A-rated boilers for heat and hot water that could help to lower your heating bills.

Sizing (output rating)

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).

The CH rating of these boilers are very closely matched – 34.4 kW for the Baxi and 35 kW for the Worcester Bosch. This shows they could both comfortably heat a home with somewhere between 15 and 20 radiators.

The DHW rating is where there's a big difference. The Worcester Bosch Greenstar 8000 Life has a DHW output of 48.9 kW. This is very high for a combi boiler and allows it to meet the demands of a home with 2 bathrooms and an ensuite. A lower 40 kW output rating for the Baxi 800 Platinum+ is suited to 2 bathrooms.

If the output rating doesn't suit your home then the boiler will struggle to meet demand (if it's too low) or you could see your bills shoot up (if it's too high). We highly recommend getting the expert opinion of a Gas Safe registered engineer before you commit to a boiler.

Warranty/Guarantee

The Baxi 800 comes with a warranty while the Worcester Bosch offers a guarantee. With a warranty, the manufacturer will take a look at the boiler if there's a fault and fix it based on their terms and conditions. A guarantee is a promise from the manufacturer to repair the boiler within a certain timeframe.

A 10 year warranty is available on the Baxi 800 Platinum+ as standard – twice as long as the 5 year standard guarantee of the Worcester Greenstar 8000. However, the Worcester's guarantee can be extended to 12 years when installed by a Worcester Bosch Accredited Installer.

Price

There's a big difference between the prices of these combi boilers. The Baxi 800 Platinum+ is the cheaper option, with a price tag around £1,307. That's around £800 cheaper than a Worcester Bosch Greenstar 8000 Life 50.

While there is a difference in price, it's worth stressing that you shouldn't go for the cheaper model if the output doesn't suit your home.

Which combi is best for a 5 bed house?

The answer to this comes down to your demand for hot water. If you have 2 bathrooms then the Baxi 800 Platinum+ will get the job done. For a 5 bed house with 2 bathrooms and an ensuite, you'll need the higher output of the Worcester Bosch Greenstar 8000 Life 50.

More combi boilers to consider

You have quite a few options when choosing a combi boiler for a 5 bed house, let's take a look at a few more.

Combi Boiler CH Output DHW Output Potential Cost
ATAG IC35+ 31.2 kW 40.3 kW
Ideal Vogue Max C40 32 kW 40 kW £1,323
Vaillant ecoTEC Plus 938 30.9 kW 38.7 kW £1,703

Best System Boiler: Vaillant vs Ideal

When choosing a new boiler for any home, you can't go wrong with Vaillant or Ideal. We've compared a system boiler by each brand that would be well suited to a 5 bedroom house.

Boiler Features Vaillant ecoTEC Plus 630 Ideal Vogue Max S32
Central Heating Output Rating 30.4 kW 32 kW
Seasonal Space Heating Efficiency Rating 94% 93%
ErP Rating A Heat A Heat
Standard Warranty 5 years 10 years
Max. Extended Warranty 10 years 12 years
Mounting Wall Wall
Dimensions in mm (HxWxD) 720 x 440 x 410 740 x 445 x 330
Potential Cost £1,353 £1,258
Typical Installation Costs £500 – £1,000 £500 – £1,000

Efficiency

Both of these system boilers are highly efficient. So whichever one you go for, you could see your heating bills go down.

In terms of the efficiency rating, the Vaillant ecoTEC Plus 630 comes out on top. That's thanks to an efficiency of 94% compared to 93%.

Sizing (output rating)

Boiler size is measured in kilowatts (kW) and shown as the output rating. This essentially reveals the power of the boiler. The central heating output of these boilers is well suited to homes with up to 20 radiators.

It's always a good idea to get the expert advice of a heating engineer when it comes to finding the right output for your home.

Warranty

The standard warranty of the Ideal Vogue Max is 10 years – twice as long as the 5 years offered by Vaillant. You have the option to extend both warranties to either 10 years for the ecoTEC Plus or 12 years for the Vogue Max.

Price

Blink Boiler Replacement Costs
You're only looking at a price difference of around £100 between these boilers – with the Ideal Vogue Max likely to be the more affordable.

Remember that on top of the price of the boiler, you'll also need to think about the installation. The price of installing a gas system boiler normally falls somewhere between £500 and £1,000. To get the best deal we highly recommend comparing quotes.

Best system boiler

Either of these boilers is a great option for a large house. They're both reliable, efficient and come with an extensive warranty. The Ideal Vogue Max is likely to be the cheaper option as well as offering the longest extended warranty, which may sway your decision.

More system boilers

There are plenty more system boilers worth considering on the market. Take a look at a few more models in the table below.

System Boilers CH Output Potential Cost
Alpha E-Tec 35S 35.1 kW £945
ATAG i32S 31.2 kW
Baxi Platinum Plus 32 32 kW £1,032

Best Regular Boiler: Ideal vs Worcester Bosch

You should only have a regular boiler installed if you already have one in your home. This is because they're complex heating systems that need a vast pipe network.

So if you're planning a direct replacement for an old regular boiler, you can't do much better than the Ideal Logic Heat H30 or Worcester Bosch Greenstar 8000 Life 35.

Boiler Features Ideal Logic Max Heat H30 Worcester Bosch Greenstar 8000 Life 35
Central Heating Output Rating 30.3 kW 35 kW
Seasonal Space Heating Efficiency Rating 93% 94%
ErP Rating A Heat A Heat
Standard Warranty / Guarantee 10 year warranty 5 year guarantee
Max. Extended Warranty / Guarantee 12 year warranty 12 year guarantee
Mounting Wall Wall
Dimensions in mm (HxWxD) 700 x 395 x 278 780 x 440 x 365
Potential Cost £1,537 £1,776
Typical Installation Costs £500 – £1,000 £500 – £1,000

Efficiency

In terms of the efficiency rating, the Worcester Greenstar 8000 just grabs victory with an efficiency of 94%. That's compared to 93% for the Ideal Logic Max Heat H30.

Let's put those percentages into context. With a boiler that's 94% efficient, for every £1 you spend heating your home, 94p will actually go towards the heat you feel from your radiators. The remaining 6p worth of heat is carried out of the flue pipe with the waste gases.

It's important to note that no gas boiler is 100% efficient. There will always be some waste.

Sizing (output rating)

The Greenstar 8000 Life is more powerful than the Logic Max Heat. You can see this by looking at the central heating output ratings of 35 kW compared to 30.3 kW.

Warranty

Healthy Boiler Warranty
Ideal boilers come with a warranty while Worcester Bosch offer a guarantee. The difference here is that a warranty will see the manufacturer visit your property to look over the boiler if there's a fault. They'll then repair if it was caused by the manufacturing process. A guarantee is a promise from the manufacturer to repair the boiler no matter the fault.

You'll be covered for longer with the Ideal Logic Max Heat – 10 years compared to 5 years on the Worcester. However, both can be extended to 12 years when fitted by an installer who is accredited by the manufacturer.

Price

The Ideal Logic Max Heat is likely to be your most affordable option. Roughly £200 cheaper than the Greenstar 8000.

Which is the best?

The winner of this head-to-head comes down to your demand for heating. The Worcester Bosch has a higher 35 kW central heating output than the 30.3 kW of the Ideal Logic Max Heat. So if you have 20 radiators, this is your best option.

More regular boilers

If you want to consider some more regular boilers, then take a look at the table below.

Regular Boilers CH Output Potential Cost
ATAG IR32 31.2 kW
Glow-worm Energy 30 kW £890
Vaillant ecoTEC Plus 430 30.5 kW £1,167

Best hot water cylinders for large homes

If the best boiler for your large house is a system or regular boiler, then you'll need a hot water cylinder too. And there are two options: unvented and vented cylinders.

A system boiler needs to be paired with an unvented cylinder. Unvented cylinders take their water supply directly from the mains – which generally gives a strong flow of water. Plus, the system is completely sealed to prevent contamination.

A vented cylinder is fed water by a tank in the loft and you'll be needing one if you're having a regular boiler installed.

Knowing which size cylinder you need

Cylinders come in different sizes. And it's important to get a cylinder that matches the hot water demands of your home. You don't want it to waste energy heating water that won't be used.

For a large house with multiple bathrooms, you'll need a cylinder with a capacity of 300+ litres. Then, as a rule of thumb, add 35 to 45 litres to the size of the cylinder for each person in the home.

To get cylinder size spot on, we highly recommend contacting a fully-qualified heating engineer (this link takes you to our sister site).


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Adam

About the author

Adam

Adam is our lead content writer who spends most of his time researching and writing articles for the Boiler Guide website. You can rely on him to keep you up to date about the future of home heating.

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