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

boiler

Getting the right boiler for any home is crucial but when you live in a large house with 5-6 bedrooms, many radiators and multiple bathrooms, it’s vitally important.

There are 3 different types of boiler: Combi, System and Regular, so we’ve compared 2 suitable models of each type to help you find the right boiler. While we’ve put 2 powerful Combi boilers head-to-head, they’re much more suited to homes with 1 bathroom that don’t have such a high demand for heating and hot water. If you know the type of boiler you’re looking to install then jump straight to the relevant section to get help finding the perfect model:

We also have guides to help with the decision making if you live in either a 3 bedroom or 4 bedroom house too.


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Best Combi Boiler for a Large House: Vaillant vs Worcester Bosch

Larger homes are better suited to a System or Regular boiler rather than a Combi but we’ve put 2 of the most powerful Combi boilers around head-to-head to help your decision making: Vaillant EcoTEC Plus 938 vs Worcester Bosch Greenstar 38CDi Classic.

What is a Combi Boiler?

Combi boilers are able to provide instant hot water to taps and showers around the home because they heat water directly from the mains. This is different to System and Regular boilers which require a cylinder to store the hot water heated by the boiler for use when required.

This is why getting a Combi boiler for a larger home comes with a warning as while they can deliver strong water pressure to 1 tap at a time, any more than that and the pressure will weaken.

Battle of the Combi Boilers: Vaillant vs Worcester Bosch

The best way to start any comparison is by looking at some of their most important features side-by-side:

Boiler Feature Vaillant EcoTEC Plus 938 Worcester Bosch Greenstar 38CDi Classic
Dimensions in mm (HxWxD) 720 x 440 x 600 760 x 440 x 360
ErP Efficiency Rating A Heat, A Water A Heat, A Water
Standard Warranty 5 years 2 years
Typical Price £1,510 £1,331
Mounting Wall mounted Wall mounted
kW Options 38kW 38kW
Flow Rate 20.1 l/m 16.4 l/m
Typical Installation Costs £500 – £1,000 £500 – £1,000

Price

There’s not too much to split these 2 Combi boilers in terms of their estimated price, with the Greenstar 38CDi coming in slightly cheaper but this could vary depending on the supplier. Remember that this doesn’t include the cost of installation, which will have to be carried out by a Gas Safe registered engineer and will vary depending on the installer carrying out the work. That’s why it’s well worth comparing quotes from multiple engineers before making your final decision.

Energy Efficiency

A recent legislation, called Boiler Plus, has been brought in to ensure that all Combi boilers have a minimum efficiency level of 92%. This means that whether you go for the Vaillant or Worcester Bosch model, you’ll be getting a highly efficient, ErP A rated boiler.

Warranty

While the EcoTEC might have the higher price tag, it comes with a lengthier warranty as standard, which means that in the unlikely event there’s something wrong with the boiler, you’re covered.

The standard 5 year warranty offered by Vaillant can even be extended further to 7 or 10 years when installed by a Vaillant Advance Installer.

Output

As a Combi boiler isn’t the recommended system for larger homes with multiple bathrooms, we’ve compared 2 powerful units, both coming in at 38kW.

Best Combi Boiler for a 5 Bedroom House: The Winner

Despite the slightly higher price tag, we have to go with the Vaillant EcoTEC Plus 938 in this battle of the Combis thanks to the higher flow rate and lengthier warranty.

Other Contenders

While you would be better suited with a System or Regular boiler, there are some other powerful Combi boilers on the market that you might want to consider:

Boiler Feature Output (kW) Typical Price
Baxi EcoBlue Advance 40kW £1,260
Ideal Logic 35kW £940
Viessmann B1KC Vitodens 100-W 35kW £1,175

Best System Boiler for a Large House: Vaillant vs Worcester Bosch

A System boiler is worth considering if you live in a larger home because they store hot water in a tank, allowing hot water to be supplied to more than one tap at a time. We’ve compared 2 System boilers that you might want to consider installing: Vaillant EcoTEC Plus 637 vs Worcester Bosch Greenstar 35CDi Classic.

What is a System Boiler?

In terms of how they operate, System boilers sit somewhere in between Combi and Regular boilers. Like a Combi, they take hot water directly from the mains but instead of heating it on demand when a tap is turned on, the water is stored in a hot water tank, like a Regular boiler, allowing for hot water to be delivered to more than 1 tap at a time.

Battle of the System Boilers: Vaillant vs Worcester Bosch

In the table below, you’ll find all of the important information that you need to know about these 2 System boilers.

Boiler Model Worcester Bosch Greenstar 35CDi Classic Vaillant ecoTec Plus 637
Dimensions in mm (HxWxD) 760 x 440 x 360 720 x 440 x 410
ErP Efficiency Rating A Heat A Heat
Standard Warranty 2 years 5 years
Typical Price £1,187 £1,350
Mounting Wall mounted Wall mounted
kW Options 35kW 37kW
Typical Installation Costs £500 – £1,000 £500 – £1,000

Price

The EcoTEC Plus will potentially have the higher price tag out of these System boilers, roughly £200 more that the Greenstar 35CDi Classic. Please note that this is a typical price of the unit itself and doesn’t include the installation costs which will vary depending on who you get to carry out the work.

Energy Efficiency

Both of these System boilers will heat your home efficiently as shown through their ErP A rating. You’ll want the boiler to run efficiently for as long as possible, which is why it’s important to have the unit serviced annually by a qualified engineer which will help to prevent potential faults. To keep the warranty valid, an annual service is often a requirement.

Warranty

Vaillant take this round by a difference of 3 years thanks to having a standard warranty of 5 years compared to the 2 years offered by Worcester Bosch. Vaillant have the added option of extending the warranty further to 7 or 10 years if certain requirements are met.

Output

The ideal output range of a System boiler being installed in a 5 bedroom house is between 35-42kW, which both of these boilers sit within but the EcoTEC Plus 637 can claim victory with a 37kW output.

If you’re not sure what size boiler you need, take a look through our guide to finding the right size boiler for your home.

Best System Boiler for a 5 Bedroom House: The Winner

It might have the higher price tag but the Vaillant EcoTEC plus 637 is a more than suitable model for a large 5 bedroom house and even has a lengthier warranty period to top it all off.

Other Contenders

Vaillant and Worcester Bosch aren’t the only brands that have manufactured suitable System boilers for larger homes, take a look at a few more worth considering.

Boiler Model Output (kW) Typical Price
ATAG IS40 40kW
Intergas Compact HRE SB 40 41kW £1,305
Viessmann B2HB Vitodens 200-W 35kW £1,300

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Best Regular Boiler for a Large House: Ideal vs Worcester Bosch

Regular boilers are the perfect system for homes with a high demand for heating and hot water which is why you should consider installing one if you live in a 5 bedroom house. This comparison of 2 Regular boilers puts 2 suitable candidates up against each other: Ideal Mexico HE vs Worcester Bosch Greenstar 40CDi Classic.

What is a Regular Boiler?

Regular boilers are the oldest type of boiler and you might have heard of them under a different name: Traditional, Conventional or Heat Only. Like System boilers, they require a hot water tank but they don’t take water directly from the mains, instead, a cold water tank needs to be installed in the loft which delivers water down to the cylinder.

They might be the oldest type of boiler around but they’ve continued to advance to be more efficient and reliable than ever. They’re sometimes more suited to older homes with original pipework which can’t cope with the strength of mains pressure.

Battle of the Regular Boilers: Ideal vs Worcester Bosch

A Regular boiler would be the ideal choice for larger homes so get to know more about the 2 boilers going head-to-head that would comfortably meet the heating and hot water demands of your home with the table below.

Boiler Feature Ideal Mexico HE Worcester Bosch Greenstar 40CDi Classic
Dimensions in mm (HxWxD) 850 x 450 x 530 760 x 440 x 360
ErP Efficiency Rating A Heat A Heat
Standard Warranty 2 years 2 years
Typical Price £2,200 £1,495
Mounting Wall mounted Wall mounted
kW Options 36kW 40kW
Typical Installation Costs £500 – £1,000 £500 – £1,000

Price

There’s typically quite a large difference in price between these 2 Regular boilers, with the Greenstar 40CDi available with a smaller price tag.

In addition to the cost of the unit, you’ll also need to consider the cost of installation which will be different from installer to installer. To get the best deal possible on the installation, we highly recommend getting quotes from multiple installers and comparing them. By quickly filling in one of our simple online forms, you will get free quotes from up to 3 trusted engineers in your area.

Due to the fairly large gap in price, you might have already made up your mind about which of these Regular boilers you’d rather go with but there’s still a lot more to compare.

Energy Efficiency

Regular boilers are more efficient than ever thanks to advancements in the technology being made over the years. Whether you go for the Ideal Mexico HE or the Greenstar 40CDi Classic, you’ll be getting a highly efficient, ErP A rated boiler.

Warranty

Both boilers come with a 2 year warranty as standard. You’ll be covered for any faults that are a direct result of the materials or manufacturing.

Output

When it comes to finding a Regular boiler for your 5 bedroom home, the output will ideally be between 35-42kW to meet the higher heating demands. Out of the boilers we’re recommending here, the Greenstar 40CDi is the more powerful unit, with an output of 40kW compared to the 36kW of the Mexico HE.

Best Regular Boiler for a 5 Bedroom House: The Winner

Victory in the battle of the best Regular boiler for a 5 bedroom house goes to the Worcester Bosch Greenstar 40CDi Classic. It comes with a much lower price tag than the Ideal Mexico HE, yet has a higher output and a warranty period that’s just as long.

Other Contenders

If you’re looking for a Regular boiler to meet the heating and hot water demands of your 5 bedroom house, then one problem you won’t have is choice. Take a look at a few more Regular boiler models you might want to consider:

Boiler Model Output (kW) Typical Price
ATAG IR40 40kW
Vaillant EcoFIT Pure 35kW £1,080
Viessmann WB1B Vitodens 100-W 35kW £1,200

Best Hot Water Cylinders for Large Homes

If you live in a large home with multiple bathrooms then we highly recommend installing a System or Regular boiler and both of these will require a hot water cylinder. There are 2 different types of hot water cylinder: Vented and Unvented cylinders.

Unvented cylinders take their water supply directly from the mains so there is no need for a cold water tank in the attic, they can be installed almost anywhere in your home and generally provide a much stronger flow of water. As you don’t need a tank of water, the system’s completely sealed which helps to prevent contamination.

A vented cylinders requires a vent pipe or tank as the water expands when heated, while unvented cylinders have inbuilt safety features like an expansion unit at the top or an air bubble that is inserted at installation to cope with the excess.

Knowing Which Size Cylinder you Need

Getting the right sized cylinder will help to provide your home with enough hot water but also mean that it isn’t so big that it spends unnecessary energy heating water that won’t be used. To give you an idea of size, for every person living in your home add 35-45 litres to the size.

To get a cylinder that’s perfectly suited to your home, you should ask a qualified installer for their advice but for large properties with multiple bathrooms, you’ll be looking at a capacity of 300+ litres.

What Next?

As we’ve mentioned in this article, it’s not just a case of choosing the right boiler for your 5 bedroom house, you also need to find a qualified engineer to carry out the installation. This will add to the cost of the boiler and because different installers will charge different amounts, it’s important to compare several quotes.

We provide a free service that allows you to get quotes from up to 3 trusted engineers in your area and there’s no-obligation: don’t like the quotes, then don’t accept any.


Get Boiler Quotes

If it’s time to replace your current boiler, use our free service to get quotes now