Best Combi Boiler for Large Houses in the UK (5+ Bedrooms)

For larger homes, it can be difficult to meet your heating and hot water requirements. Combi boilers are generally best for smaller homes, but there are many more powerful options that can meet the needs of 5-bedroom homes or even larger ones.

This article will go into the various options available so you can pick.

While our list is thorough, it may not provide you with what you need, as every home is different. If you’re interested in a combi boiler for a large house, it’s best to get your home assessed by a reliable installer. Finding one can be a challenge, taking up hours of research and calling up companies. That’s why our service can minimise the hassle, providing you with up to 3 free, non-binding quotes from installers we’ve personally vetted.

Fill out one simple 30-second form, and we’ll do the rest. Click the button below to get started.

We’ve selected the following combi boilers after researching numerous options from the highest-rated options:

We explain the criteria for these choices in another section below. Another important thing to keep in mind is that the prices here are purchase prices and do not include the cost of combi boiler installation.

For conventional and system boilers, 18kW to 26kW boilers work great for large homes. Alternatively, for combi boilers, 30kW to 50kW outputs are necessary since combis have a dual function and they produce hot water on demand, rather than having a external water storage.

Generally, conventional and system boilers are the best boilers for a 5-bedroom house, but combis can also keep up with a high enough output and without too many simultaneously running taps within the home. The latter can be a great option for homes that may not want bulky water storage tanks or other peripheral components.

Other boiler types may be more suitable if you require higher water consumption or have more than 2 bathrooms.

Worcester Bosch always tops the ratings with their boilers, and their Greenstar 8000 Life is no different. This high-power output combi boiler is available in both gas and LPG (liquid petroleum gas) models, allowing for some fuel variety in your selection. It has a standard warranty of 7 years but can be extended to 12 when installed by a Worcester Bosch accredited installer.

While Worcester Bosch has a lot of combi options, the Greenstar 8000 Life Combi is perfect for small, medium, and large-sized homes since it has a large range of outputs. It can handle one or two-bathroom homes with a powerful flow rate (for a combi boiler). Compared to other Worcester Bosch boilers in the same range (like the Highflow 550CDi), it has smaller dimensions and a wider output range for larger homes.

The Worcester Bosch Greenstar 8000 Life is best for homes with high hot water and heating needs. It can cover some very large homes with the 50kW versions, allowing for high efficiency without sacrificing water flow and temperatures.

While Viessmann’s Vitodens line has a lot of options, the 35kW version is perfect for larger houses. As a classic boiler that often pops up in lists of prominent system and combi boilers (and for good reason). With an efficiency rating that can go up to 98%, it can ensure you reduce gas bills with one of the best potential efficiencies, rivalling even electric boilers in the right season.

Viessmann provides great customer service and has a high Trustpilot score of 4.2. The Vitodens easily claims high accolades in reviews and other best combi boiler lists. It also has a decent warranty and price to boot.

The Viessmann Vitodens 100-W is a good mid-price option for homes that need high efficiency. It’s sure to keep those gas bills down while providing reliable service.

Alpha’s E-TEC line has a number of different outputs, but the ideal version for larger homes is the 38kW edition. The company makes a strong offer at affordable prices, allowing for a strong basic 10-year warranty that can add an additional 3 years on top, totalling 13-year coverage. The boiler is also LPG compatible with a few modifications, making it great for off-grid homes.

The Alpha E-TEC Plus has several great elements, like a stainless steel heat exchanger and corrosion protection using a zinc-plated vessel. It’s also easily cleanable due to its compact structure and provides easy access to components.

At a £1,100 to £1,200 price point, this boiler is great for homes that want to lower their initial costs without sacrificing quality. Alongside the price, the 13-year warranty ensures longer company support than many other boilers on this list.

Grant has a number of great oil boiler options, however, the best combi they’ve produced is easily the Grant Vortex Pro. As an external boiler, it will require space outside. This can be handy if you don’t want to deal with potential spillages in the home and save space indoors.

The Grant Vortex Pro is a high-power, high-efficiency combi boiler with a decent 10-year warranty. A good condensing oil boiler will have an efficiency of about 93%, but the Pro manages 94.5%. This is particularly high for an oil boiler.

The Grant Vortex Pro is a great option for homes not on the gas grid or homes in Northern Ireland, where gas boilers are less common.

Ideal is one of the UK’s premium boiler manufacturers, providing some great boilers in all categories. The Vogue Max is the highest-power combi boiler they provide. While it’s better suited for large homes that have lower water consumption, the boiler is equipped with some great features that make it a great choice overall.

Ideal has always provided great customer service and made its boilers easy to use. Their warranty can be as high as 12 years just by registering the boiler online. It can also be a great option in the UK if you want to support national companies while saving on import prices.

This boiler is for homeowners who want a trustworthy product with an easy-to-use design, excellent customer service, and a great warranty.

We compared upwards of 50 boilers from various “best of” lists and put them together to create this list. There are a number of metrics we used to determine what combi boilers are best for larger properties.

Determining the best combi boiler for a 5-bedroom house or larger property can be tough. Each home is different, and a specific boiler may not be best suited for your particular home. If you want an accurate new boiler cost and an informed suggestion, you will need to ask a reliable installer to assess your home.

Looking for a reliable company takes hours and still may not provide you with peace of mind as to whether you’ve hired a reliable installer. Luckily, we provide a better way.

With our service, you just need to fill out a 30-second form, and we’ll find you up to 3 free, non-binding quotes from our network. Every installer is thoroughly vetted and will provide the best prices in your area. Click the button below to get started.