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Best Combi Boilers In 2022

Do you need a new gas combi boiler but are unsure which brand and model to buy and get installed? Then this is the guide for you!

If you’re about to buy a new gas combi boiler for your home, you, of course, want to find the best boiler for your money. But with so many combi models to choose from, it can be tricky to know what boilers are the best and which one to get installed.

Knowing that you need a combi boiler makes life a little easier because you no longer have to think about what boiler type to get. However, you still have to consider the different boiler brands, warranties and combi sizes before purchasing a new boiler. 

This guide covers the best combi boilers available on the UK market right now in 2022 and everything else you need to know about choosing the perfect combi for your home. 

Top 5 combi boiler brands

A survey carried out by the UK’s consumer champion Which? has revealed that the top 5 boiler brands in 2022 are:

  • Worcester Bosch
  • Viessmann
  • Baxi
  • Vaillant
  • Ideal   

1 – Worcester Bosch combi boilers

The only boiler brand to be recommended by Which? for 12 years, Worcester Bosch is one of the market-leading brands trusted by installers and homeowners. They offer a wide range of reliable and highly efficient gas combi boiler models with competitive warranties of up to 10 years. 

Worcester Bosch boilers tend to have a slightly higher price tag than some other well-known combi brands but now offers customers reliable combi boiler models at a competitive price point, making them accessible for all. 

Why is Worcester Bosch a top combi boiler brand?

Some of the reasons Worcester Bosch is one of the best combi boiler brands include:

  • 12 years of Which? Best Buys on their gas boilers
  • Worcester Bosch combi boilers have a 5-star reliability rating 
  • 10-year guarantee to customers who choose a Worcester Bosch accredited installer
  • Customers and engineers in the UK rate Worcester Bosch highly
  • Excellent rating on consumer review site Trustpilot

2 – Viessmann combi boilers

Viessmann is known for producing top of the range gas combi boilers with German engineering at its finest. The brand has been a Which? Best Buy award winner for many years and offers some of the best combi boilers on the market today, from compact units to powerful condensing boilers for larger homes. 

Although a leading manufacturer of reliable and high-efficiency boilers, Viessmann’s combi models are affordable whilst offering excellent quality and generous warranties. 

Why is Viessmann a top combi boiler brand?

Some of the reasons Viessmann is one of the best combi boiler brands include:

  • Combi boiler range has been awarded Which? Best Buy status
  • Customers are quick to recommend their Viessmann boilers
  • Option to extend warranty up to 10 or 12 years
  • Viessmann receives high scores for build quality from engineers
  • Excellent rating on consumer review site Trustpilot

3 – Baxi combi boilers

UK boiler manufacturer Baxi offers a superb range of well-made combi boilers backed by leading warranties and award-winning customer support. The brand also has a fantastic reputation for manufacturing reliable and efficient combi models that are easy to install and operate. 

Baxi is an affordable boiler brand known for offering good value for money and cost-effective combi boilers, so it comes as no surprise that they’re one of the most popular brands on the market today. 

Why is Baxi a top combi boiler brand?

Some of the reasons Baxi is one of the best combi boiler brands include:

  • One of the top three cheap boiler brands according to Which? 
  • Reliable and affordable combi boiler range
  • Baxi combi boilers have a 5-star reliability rating 
  • Most combi models come with a standard warranty of 7 to 10 years
  • Highly recommended by customers and engineers in the UK
  • Excellent rating on consumer review site Trustpilot

4 – Vaillant combi boilers

Although Vaillant combi boilers boast German design and engineering, they are made right here in the UK. The brand has an excellent reputation among customers and engineers for offering boilers with the highest efficiency and performance, all built with top-quality components that are reliable and made to last. 

Vaillant isn’t the cheapest boiler brand on the market but was named the top-rated UK gas boiler brand after being awarded Best Buy status by Which? in 2020.

Why is Vaillant a top combi boiler brand?

Some of the reasons Vaillant is one of the best combi boiler brands include:

  • One of the top three boiler brands according to Which? 
  • Vaillant has a 5-star build quality rating from engineers
  • Customers rate their Vaillant boilers
  • Most combi models have been Quiet Mark accredited
  • 7 to 10-year guarantee available when you book a Vaillant Advance installer
  • Excellent rating on consumer review site Trustpilot

5 – Ideal combi boilers

With over 100 years of experience providing high-quality boilers to customers across the UK, Ideal is a brand you can trust to offer reliable combi boilers at affordable prices. The brand has a fantastic selection of easy to install and simple to operate combi models renowned for their reliability and energy efficiency. 

Ideal’s combi boilers are competitively priced and offer good value for money, making them a great choice if you want a dependable boiler that doesn’t compromise on quality. 

Why is Ideal a top combi boiler brand?

Some of the reasons Ideal is one of the best combi boiler brands include:

  • One of the top three cheap boiler brands according to Which? 
  • Reliable with an affordable price tag
  • Ideal combi boilers have a 5-star reliability rating 
  • 7, 10 or 12-year parts and labour warranty available
  • Excellent rating on consumer review site Trustpilot

The best combi boiler models in 2022

Now that you know a bit more about the best boiler brands in the UK, we’re going to share our top combi boiler models available from each brand. 

Worcester Bosch Greenstar 4000 Combi

Perfect for small to medium-sized homes with one bathroom, the Greenstar 4000 is easy to live with because it’s one of Worcester Bosch’s quietest combi boilers. The boiler is available with a 25kW or 30kW output to suit your needs and delivers a hot water flow rate of 9 or 10.8 litres per minute, respectively. 

A-rated with an efficiency score of over 90 per cent, the Greenstar 4000 is among the most efficient combi boilers on the market and features an innovative ‘Quick Tap’ water-saving function to help reduce water waste. It also boasts wireless connectivity and is compatible with smart thermostats, like Hive or Google nest. 

What’s more, you can get up to 10 years warranty when you buy the Greenstar 4000 Combi and get it installed by a Worcester Accredited installer. 

Worcester Bosch Greenstar 4000 Combi Typical Price

Viessmann Vitodens 100-W Combi

The entire Vitodens combi boiler range last achieved Which? Best Buy status in 2021, but the Vitodens 100-W is Viessmann’s best-selling gas condensing combi boiler. A popular solution for smaller well-insulated homes, the boiler is available in a range of outputs to suit your heating and hot water requirements and has a user-friendly touch screen for easy operation. 

It comes with a 5-year guarantee as standard with the option to extend by a further 7 years. 

Viessmann Vitodens 100-W Combi Typical Price

Viessmann Vitodens 200-W Combi

If you live in a larger home, the Viessmann Vitodens 200-W Combi could be a perfect choice. It has many of the benefits of the 100-W, but the efficiency rating is higher at 98%.

The Vitodens 200-W comes with a 3-year warranty as standard (not great) which can be extended up to 12 years when installed by a Viessmann Trained installer. 

Viessmann Vitodens 200-W Combi Typical Price

Baxi Duo-tec Combi

Made in the UK using high-quality brass components, the Baxi Duo-tec is a great choice of combi boiler for small to medium-sized homes in the UK. It can provide up to 40kW and 16.4 litres/minute of hot water, meaning it offers exceptional hot water performance and can meet most hot water requirements. 

Easy to install and service, the Baxi Duo-tec Combi is popular with installers and comes with multiple flue lengths to allow flexible installation options. The boiler also comes with a 7-year standard warranty, and you may be able to extend this when you choose a Baxi approved installer. 

Baxi Duo-tec Combi Typical Price

Vaillant ecoTEC Plus Combi

A flexible combi ideal for almost any home and lifestyle, the ecoTEC Plus Combi from Vaillant promises high control, efficiency and performance. Not only is the boiler Quiet Mark awarded, but this combi is smart and can tell when you require less heating power and drop to using only 16% of its maximum power to save fuel – and save you money.

Available from 25kW to 38kW, the ecoTEC Plus is Vaillant’s flagship boiler and can deliver hot water within 5 seconds. It features premium components, like its stainless-steel heat exchanger, and comes with a 5-year guarantee as standard with the option to extend to 7 to 10 years when installed by a Vaillant Advance installer. 

Vaillant eco-TEC Plus Combi Typical Price

Ideal Vogue Max Combi

The Vogue Max Combi is an affordable combination boiler, even though it’s part of Ideal’s premium range. It is made with top-quality components and comes complete with an Ideal System Filter to ensure your boiler is reliable and enjoys a long life. The boiler is also quick to install, easy to use, and compatible with a range of optional controls that allow you to schedule your heating. 

Ideal’s Vogue Max Combi comes with a generous 10-year warranty as standard, which can be extended to a whopping 12 years if installed and serviced each year by a Max accredited installer.  

Ideal Vogue Max Combi Typical Price

Combi boiler sizing

When you know which combi boiler brand and model you want to get installed, you need to determine the correct size for your home and needs. The size of a boiler, also known as the output, is measured in kilowatts (kW). 

The table below will give you a rough idea of what size combi boiler you need for your home based on the number of bedrooms, bathrooms and radiators you have. 

Please use the information in the table as a rough guide only, and always ask a Gas Safe registered engineer for a more precise recommendation before purchasing a new combi boiler.

BedroomsBathroomsRadiatorsCombi Boiler Size/Output
1-31Up to 1024kW to 27kW
2-41-2Up to 1528kW to 34kW
3-52+Up to 2035kW to 42kW

What next?

Once you know what combi boiler size you need and choose a brand and model, you should compare prices to find the best deal. The best way to compare prices is to get quotes on the boiler and the installation from different installers. 

We can help you get free quotes from Gas Safe registered installers, regardless of whether you opt for one of the combi boilers we mentioned in this guide or another combi boiler brand. All you need to do is complete our online form to receive free quotes and save on a new combi boiler.