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Last updated: 13 March 2024

Combi Boiler Prices in the UK: Compare Models & Get Great Deals

Combi boiler prices uk

Combi boilers remain the most popular type of boiler in the UK. From one unit, combi boilers provide heating and hot water to your home. Without any additional external units, they will also save valuable home space.

So, what can you expect when it comes to combi boiler prices? New combi boilers can reach costs of £3,000, before installation. There are many deciding factors to be aware of that will dictate the total new combi boiler prices. 

To compare combi boiler prices and to find the best ways to limit mounting costs, look no further! We’ve put together price estimates from across today’s market for anyone looking for the best combi boiler deals.

Ensuring that you’re getting the most accurate and fairest installation price can be difficult with such a wide scope of potential costs. An experienced heating expert can narrow down the price range for your particular situation. But how long would it take to find a professional you can trust?

Thankfully, we can do the searches for you. Complete our 30-second form and we’ll connect you with up to 3 local heating engineers for free. Compare their offers to find the best deal and ensure you don’t get overcharged. To begin, click the button below!

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How much is a combi boiler?

Combi boiler prices in the UK will usually land between £500-£3,000, before installation. If you’re considering a new combi boiler, then an economy model will start at £500 and go up to £900. More mid-range combi boiler prices start at £900 and go up to £1,500. High-end combi boilers will go from £1,500-£3,000

Combi boiler prices
Quality of boilerCost excluding installation
Economy£500 – £900
Mid-range£900 – £1,500
High-end£1,500 – £3,000

The prices shown in the table are only for purchasing a boiler, so installation costs are not included. New boiler costs include both the upfront boiler costs as well as the cost to install with all the necessary parts and labour. 

Upfront combi boiler costs are decided by various factors, these include:

  • Boiler size (kW): Boiler size refers to its power output, measured in kilowatts. The right-sized boiler depends on your energy demands. This can be estimated by the number of radiators and bathrooms you have in your home. Combi boilers have separate kW ratings for heating and domestic hot water. Since combi boilers must work harder to provide domestic hot water, this output will be higher. Therefore, it is a good indicator of the size of the boiler you need. 
  • Warranty length: A lengthy warranty period is an indicator of the brand’s confidence in its product. It also gives you peace of mind that service and repair costs are covered, should your boiler run into any issues. New combi boilers will come with a standard warranty period that can be extended, subject to certain terms and conditions.  
  • Fuel type: The type of fuel you use will impact the upfront costs, the running costs and your boiler’s efficiency. Most home heating systems in the UK will run on natural gas. For homes off the gas grid, there are various low carbon heating systems or alternative fuel types, such as electricity and LPG. 

Since every home has its own unique specifications that will affect the combi boiler installation process, it can be difficult to estimate the total new combi boiler costs. Although, you can expect an installation to fall somewhere between £1,700 and £3,500 for a simple combi boiler swap.  

Combi boiler prices fitted

The price of having a combi boiler fitted can range from £1,200 to £5,000, with prices depending on whether the unit installed is an economical, mid-range, or top-end model. Installation cost ranges from £700 to £2,000. You can see the prices in the table below for a more detailed breakdown of the costs.

How much does a combi boiler cost?
Type of boilerPrice (excluding installation)Installation costsPrice (fitted)
Economy combi£500 – £1,500£700 to £2,000£1,200 – £3,000
Mid-range combi£1,500 – £2,500£700 – £2,000£2,200 – £4,500
Top-end combi£2,500 – £3,000
£700 – £2,000

£3,200 – £5,000

To fully understand the cost of your boiler it’s important to talk to a professional. However, for that, you’ll have to find an installer you know you can trust. Ordinarily, this can take days of research and comparing prices on your own. Luckily, you can speed up the process using our service.

All you have to do is fill out a 30-second form and you can obtain up to 3 free, non-binding quotes from trustworthy installers in our network. We’ve done the heavy lifting of vetting several professionals so you don’t have to. Click the button below to get started.

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Combi boiler prices from the top 5 manufacturers

We’ve compiled a list of combi boiler prices from the top 5 boiler manufacturers in the UK. They have been selected for their highly reputable status within the UK’s boiler manufacturing industry, based on customer reviews and the awards they’ve won. 

Worcester combi boiler prices

worcester combi boiler prices

Combi boiler prices |  £730 – £2,475

Trustpilot | 4.6 out of 5, 40,838 reviews 

Worcester Bosch is one of the most recognisable and popular brands based in the UK. Bosch’s gas boiler range has been endorsed for 12 consecutive years by “Which? Best Buy” (the Best Buy nomination on a website that provides expert testing). Therefore, you can be sure that a new Bosch boiler will perform above the rest. 

Bosch offers great value for money with some of the most compact combi boilers around. They also offer warranty options that extend up to 12 years. The standard warranty sits at 5 years for its gas boiler range and 2 years for its oil boilers. It also features the most powerful combi boilers on this list, with outputs up to 55kW for hot water and comes with a maximum of 94% efficiency.

Worcester Bosch Combi Boiler Prices: Overview
Boiler range DHW output (kW) Efficiency Warranty Price range 

Greenstar 8000 Style Combi 

30, 35, 40, 45, 50

94%

5 years 

£1,300 – £2,300

Greenstar 8000 Life Combi 

30, 35, 40, 45, 50

94%

5 years

£1,200 – £2,100

Greenstar CDi Compact 

28, 32, 36

94%

5 years

£1,000 – £1,300

Greenstar Si Compact 

25, 30

94%

5 years

£950 – £1,110

Greenstar 4000

25, 30

94%

5 years

£1,050 – £1,200 

Greenstar 2000

25, 30

93%

5 years

£730 – £850

Greenstar CDi Highflow 

44, 55

92%

5 years

£1,900 – £2,475

Greenstar Heatslave II 

12, 18, 25, 32

94%

2 years

£2,369 – £2,400

Greenstar Heatslave II External 

12, 18, 25, 32

94%

2 years

£2,460 – £2,800

Baxi combi boiler prices

Baxi combi boiler prices uk

Combi boiler prices | £540 – £1,280

Trustpilot | 4.6 out of 5, 53,499 reviews 

Baxihas been manufacturing in the UK since the 1800s and has established itself as a popular, reliable brand in the home heating industry. Baxi is rated highly for its exceptional customer service, even being listed as one of the top companies for customer service in 2020. 

Baxi offers the most competitive price points out of the top 5 brands, even with up to 10 years of warranty. This makes them a great option for those looking for a new combi boiler on a tight budget. 

Baxi Combi Boiler Prices: Overview 

Boiler range DHW output (kW) Efficiency Warranty Price range 

Baxi 200 Combi 

24, 28

93%

2 years

£610 – £660

Baxi 400 Combi

24, 28

93%

5 years 

£680 – £730

Baxi 600 Combi 

24, 30, 36

93%

7 years

£789 – £1,050

Baxi 800 Combi 

25, 30, 36

93%

10 years

£858 – £1,205

Baxi Platinum Combi 

24, 28, 33

92%

10 years

£928 – £1,087

Baxi Platinum+ 40kW Combi

40

93%

10 years

£1,307

Baxi Duo-tec Combi 

24, 28, 33, 40

92%

7 years

£761 – £908

Vaillant combi boiler prices

vaillant combi boiler prices

Combi boiler prices |  £910 – £1,850

Trustpilot | 4.4  out of 5, 19,794 reviews

Vaillant is another highly rated, long-established brand with nearly 150 years of experience manufacturing in the UK. They are a recognised player in traditional home heating as well as innovators in low carbon heating solutions. 

The ecoTEC Green iQ boiler was awarded a Housebuilder Product Award for Best Interior Product in 2018 and the brand won a Domestic and General Excellence and Quality award for its customer service in 2020. While standard warranties last between 2-5 years, there are various options to extend this up to 10 years. 

Vaillant Combi Boiler Prices: Overview
Boiler range DHW output (kW) Efficiency Warranty Price range 

ecoTEC exclusive with Green iQ combi 

35, 43

94%

10 years

£1,425 – £1,673

ecoTEC plus combi 

25, 32, 35, 38

94%

10 years

£1,152 – £1,703

ecoTEC pro combi

24, 28, 30

93-94%

10 years

£1,015 – £1,211

ecoFIT pure combi 

25, 30, 35

94%

2 years

£907 – £1,192

Ideal combi boiler prices

ideal combi boiler prices

Combi boiler prices | £850 – £1,400

Trustpilot | 4.8 out of 5, 38,782 reviews

Idealwas established in the UK in 1906 and has since been recognised for its innovation across traditional and low carbon heating technologies. Its flagship Logic+ Combi Boiler range was awarded a Good Housekeeping Reader Recommended Status award and a Queen’s Award for Enterprise. 

Ideal is especially known for offering more affordably priced boilers across a wide range of outputs, and with extensive warranty periods of 8-10 years. Ideal also achieves the highest rating on Trustpilot from the top 5 manufacturers. 

Ideal Combi Boiler Prices: Overview 
Boiler range DHW output (kW) Efficiency WarrantyPrice range 

Logic Max Combi Boiler 

24, 30, 35

94%

10 years 

£968 – £1,156

Vogue Max Combi Boiler 

26, 32, 40

93%

10 years

£1,089 – £1,325

Vogue Gen2 Combi Boiler 

26, 32, 40

93%

8 years 

£1,165 – £1,354

Logic+ Combi Boiler

24, 30, 35

94%

7 years

£847 – £1,039

Not sure which boiler brand fits your situation best? A certified heating expert can help you choose the best boiler for your needs. 

Completing our form takes 30 seconds and brings you up to 3 free quotes from heating experts. You can compare those quotes to find the best deal. Our offer is completely free and non-binding. Just click the button below to begin!

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Viessmann combi boiler prices

viessmann combi boiler prices

Combi boiler price range | £1,000 – £2,980

Trustpilot | 4.0 out of 5,  4,440 reviews 

Viessmann was established in the UK in 1989. Despite its relatively short time in the home heating industry, Viessmann has maintained a favourable reputation. Viessmann was awarded a Which? Best Buy for its combi boiler range in 2021.

Viessmann’s standard warranty period is between 3-5 years, with chargeable upgrades up to 12 years. The Vitodens boiler range comes with a variety of patented features including Viessmann’s stainless steel heat exchanger for improved efficiency. It also features a storage combi boiler, the 222-F model, with internal hot water storage for homes with high energy demands. 

Viessmann Combi Boiler Prices: Overview
Boiler range DHW output (kW) Efficiency Warranty Price range 

Vitodens 050-W

25, 30

92%

3 – 10 years

£930 – £1,230

Vitodens 100-W 

26, 30, 35

94%

5 – 12 years 

£1,175 – £1,500

Vitodens 111-W

30, 33

94%

5 years 

£1,836 – £1,976

Vitodens 222-F

19, 25, 32

92%

3 – 12 years 

£2,560 – £3,520

Viessmann 200-W

30, 35 

94%

Up to 10 years 

£1,550 – 1,600

LPG combi boiler prices

Liquid Petroleum Gas (LPG) is a popular alternative to natural gas for homes with no connection to the gas grid. Because of this, most combi models can run on LPG either automatically or with a conversion kit.

From the list of top 5 manufacturers, Bosch, Baxi and Vaillant offer specific LPG combi boiler models as part of their range, which we’ve provided below.

Worcester Bosch 

  • Greenstar 8000 Style Combi | £1,300 – £2,297
  • Greenstar 8000 Life Combi |  £1,200 – £2,100
  • Greenstar CDi Compact | £1,000 – £1,370
  • Greenstar Si Compact | £1,075 – £1,160
  • Greenstar 4000 | £1,200
  • Greenstar 2000 | £730 – £850
  • Greenstar CDi Highflow | £2,130 – £2,475

Baxi 

  • Baxi 200 Combi LPG (24kW) | £610
  • Baxi 400 Combi LPG (24, 30kW) £680 – £730
  • Baxi 600 Combi LPG (24, 30, 36kW) | £789 – £1,050
  • Baxi Duo-tec Combi LPG (28kW) | £980

Vaillant 

  • ecoTEC plus combi (32kW) | £1,248
  • ecoTEC pro combi (28kW) | £1,119

Ideal combi boiler models will run on LPG using a conversion kit. Viessmann’s Viotdens line will run automatically on LPG, meaning there’s no need to source an additional conversion kit. 

With such a plethora of boiler choices, you might be wondering which option you need and how expensive the installation would be for your situation. The best way here is to compare quotes from different boiler installers. However, finding and vetting the installers can cost you hours of the time you could have spent with your family instead.

Thankfully, there’s a way to avoid all this hassle. Simply fill out our quick form and we will connect you with up to 3 local installers who will offer quotes based on your particular housing situation. By comparing these free, non-binding quotes, you can find the best deal for your home. Click below to get started.

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Best value combi boilers

You may find the most budget-friendly prices do not always represent the best combi boiler deals. It’s far more cost effective to find an efficient combi boiler with a sizable warranty that matches your home’s energy needs. The most premium models will also come with custom features that will improve new boiler performance and reduce your running costs. 

Below, we’ve highlighted the cheapest combi boilers alongside those with the best value for money, according to house size.

Best boiler deals overview
House sizeCheapestBest value
Small house (up to 10 radiators) Baxi 400 Combi 24kW | £680 Worcester Bosch Greenstar Si Compact 25kW | £1,075
Medium-sized house (up to 15 radiators)Baxi 400 Combi 28kW | £660Baxi 800 Combi 30kW | £955 
Large house (up to 20 radiators)Baxi Duo-tec 40kW | £908Worcester Bosch Greenstar 8000 Life 40-50kW | £1,495 – £2,100

Find the best combi boiler deals

There are many ways to ensure you are getting the best deals for your new combi boiler which we’ve listed below:

  • Seasonal deals: the best time of year to buy a new boiler is in the spring and summer months when demand will be lower. During the winter, you can expect to pay more for a new boiler since more people will need replacements. 
  • Local installers: an installer in your area can supply parts and labour more easily and efficiently than nationwide companies. Therefore, they will likely offer much cheaper installation rates. 
  • Compare quotes: installers will offer you quotes based on their assessments of your home and how complex the installation might be. The best way to ensure you are getting a fair price is to seek itemised quotes from multiple installers. Then, you can compare their rates to locate the best deal. 

The process of finding a new boiler, as well as the right installer for the job can be stressful and time-consuming. At GreenMatch, we can eliminate this pressure. Fill in the quick and easy form, and leave it to our team to connect you with the best local installers in your area.

Within 48 hours, you’ll hear from up to 3 local installers who will assess your needs and offer you quotes. With multiple quotes to compare, it’s so much easier to lock in the best deal. Simply click below and request quotes today!

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Ciaran Wark
Written by Ciaran Wark, Writer

Ciaran is a content writer at GreenMatch. Whether writing about sustainable aviation fuel or heat pumps, Ciaran has passion for informing readers about pivotal technologies that are reshaping our world.

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