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Last updated: 11 August 2022

Evaluate Combi Boiler Prices

What Is the Price of a Combi Boiler?

A new combi boiler usually costs between £500 - £3,000. The cost of fitting your new combi boiler could land anywhere between £550 - £2,500, depending on how complex the replacement job will be. 

Combi boilers make a great boiler option for many homes in the UK. They provide an instant supply of hot water directly from the mainlines. This saves you money since energy is not wasted on storing hot water. 

You can also save on installation costs since combi boilers do not require a hot water cylinder or cold water tank. This compacts them to one unit, making them a great option for smaller homes.

How a combi boiler works.

GreenMatch’s free, no-obligation form allows you to compare the best combi boiler prices, specific to your area. This will help you make an objective decision and you’ll benefit from the cheapest, most competitive prices.

What Factors Affect Combi Boiler Prices?

Combi boiler prices in the UK depend on many factors:

  • Brand of manufacturer
  • Boiler size and output 
  • Warranty length
  • Complexity of the installation and service costs
  • The size of your home and your energy needs 

The following table can give you an overview of boiler prices according to house size:

House Size No. of Bedrooms No. of Bathrooms No. of Radiators Power Output Price Range
Small House 1-2 1 10 24-27kW £599 - £1,499
Medium House 3-4 1-2 15 28-35kW £699 - £2,199
Large House 4+ 2+ 20 36-42kW £799 - £1,999


This range means that there is plenty of opportunity to save on costs. Finding a reliable company that offers warranty is also important and will save you money in the long term.

Keep a realistic estimation of your energy demands in mind. If the combi boiler is too small, it will fall short of providing adequate hot water and heating. If it’s too large, then it’s a great waste of energy and will cause your bills to go up. 

Besides the upfront costs of a new combi boiler, you must also consider the costs to install. This can typically reach costs of £2,500 for a simple like-for-like boiler swap, and up to £4,000 for more complex installations.

The best way to avoid mounting installation costs is to compare quotes from multiple installers. This can be a painstaking task to undertake and knowing the accurate and fair cost for the job can be difficult. 

Luckily, GreenMatch’s quick and simple form can put the power back into your hands. Fill in the quick and easy form and you’ll be connected to up to 4 local installers from our trusted network. After a free consultation, they will offer you tailor-made quotes based on your home's unique specifications. With multiple quotes, you can take advantage of the best local deals.

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The Variety of Combi Boiler Brands - Which Is The Best?

When comparing combi boiler costs and brands, keep to the top, most reputable manufacturers. You’ll still find a manageable price range and you can be assured of quality and reliability.

We’ve put together the best combi boiler series from across the top brands in the UK. These offer the best in terms of cost, energy efficiency, features and service. This will help consolidate your search, and give you hints of what to look out for! 

Combi Boiler closeup.

Worcester Bosch

Greenstar 28/32/36 CDi Compact  

Bosch is one of the leading, most recognisable manufacturers for their innovation and customer satisfaction. The Greenstar CDi Compact is Bosch’s smallest boiler to date. This makes it perfect for smaller homes but still powerful enough for homes with up to 2 bathrooms. This will also save you in installation costs since it will take less time to have it fitted. 

The Greenstar CDi also comes with an aluminum silicon heat exchanger, saving on energy. It also includes frost protection, allowing you to store your boiler in a loft or garage, and it’s compatible with solar panels.

Bosch Greenstar boiler.Greenstar CDi Compact Facts 

  • £1,000 - £1,500 
  • Central heating output: 24kW 
  • Domestic hot water output: 24kW - 36kW
  • Gas fired, LPG available 
  • A ErP rating, 94% energy efficiency 
  • A+ ErP rating with optional smart internet controls
  • 10-year guarantee 
  • Small, medium or large-sized homes (up to two bathrooms)


EcoTEC Plus Combi (825, 832, 835, 838) 

Valliant is known for their highly innovative and energy-efficient boilers. The EcoTEC Plus has a modulation range of 6:1 meaning it can adjust its maximum output and save energy.

This combi boiler also comes with a stainless steel heat exchanger, internet controls, frost protection and is credited for low noise levels. The EcoTEC is also certified as NOx class 5 meaning it releases less harmful gas during combustion. It can also be combined with renewable heating solutions. 

Valliant EcoTEC boiler.EcoTEC Plus Combi Facts

  • £950 - £1,500
  • Central heating output: 25kW - 38kW
  • Domestic hot water output: 20.4kW - 30.1kW
  • Gas fired, LPG available 
  • B/A ErP rating, 86% - 94% energy efficiency 
  • A+ ErP rating with optional smart controls
  • 5-year guarantee as standard 
  • Small, medium or large sized homes


Vitodens 200-W B2KE (30kW, 35kW)

Viessman is an internationally recognised brand, founded in Germany. The Vitodens 200-W combi range saves energy costs with a 17:1 modulation ratio. It comes with a custom Inox Radial “self cleaning” heat exchanger that prolongs the boiler's lifespan. It also features the industry’s first combustion management system, giving it a NOx class 4. It’s low fan speed also means it will run quietly.

Veissmann Vitodens boiler.Vitodens 200-W B2KE Facts 

  • £1,100 - £1,300
  • Gas fired, LPG available 
  • Central heating output: 25.4kW - 32kW
  • Domestic hot water output: 31.3kW - 34.2kW
  • A ErP rating, 94% energy efficiency
  • Smart internet controls  
  • 10-year warranty 
  • Medium or large homes


Duo-tec Combi (24, 28, 33, 40)

This award winning combi from Baxi offers more affordable price points across a range of outputs. The Duo-tec has a flow rate of up to 16.4 litres per minute making it suitable for large homes with more than one shower. It’s easy to re-pressure thanks to its built-in filling loop. It also features easy-to-use controls and frost protection.

Baxi Duo-tec boiler.Duo-tec Combi Facts 

  • £760 - £910 
  • Central heating output: 21kW - 34.4kW
  • Domestic hot water output: 24kW - 40kW
  • Gas fired,  LPG available 
  • A ErP rating, 92% energy efficiency 
  • 7-years warranty 
  • Only 55% score on Which? survey  
  • Medium or large sized homes


Logic+ Combi (C24, C30, C35) 

Ideal is a long-standing award winning manufacturer in the UK. The Logic+ range comes with frost protection and easy-to-use controls. It has a modulation ratio of 5:1 meaning that the minimum output is 20% of the boiler's capacity. Therefore, the boiler's operation will automatically adjust to meet your demands, saving you in running costs.

Ideal logic+ boiler.Logic+ Combi Facts 

  • £1,000 - £1,260
  • Central heating output: 24.2kW 
  • Domestic hot water output: 24.2kW - 35.3kW
  • Gas fired, LPG available
  • A ErP rating, 94% energy efficiency
  • Smart internet controls 
  • 7-years warranty
  • Only 55% score on Which? survey 
  • Small or medium homes (with one shower)

Combi Boiler Installation Costs - How Much Does a Boiler Installation Cost in 2022?

The cost of fitting your new combi boiler could cost anything between £550 - £2,500.

Combi boilers are designed to be compact and contained to one unit. Therefore, the installation process should be relatively quick and easy, compared to other boiler types.

Costs vary depending on whether you would like to (from typically lowest to highest price): 

  • Replace an old combi boiler model with a new one, in the same location.
  • Install a new combi boiler in a different location.
  • Replace a system/conventional boiler with a new combi boiler, including hot water storage and cold water tank removal.

Overall combi boiler installation costs will also depend on the engineer you hire for the job. Popular nationwide companies will have much higher rates than those local to you. The trouble comes from finding the right local installer and knowing whether you can trust they will charge a fair price. 

GreenMatch can help by connecting you with up to 4 installers. We will only connect you with the best, local installers whose quotes will be based on your home's unique specifications and relative to your area. With up to 4 installer quotes, you can compare to find the best deal and truly maximise your savings. 

Begin by selecting your region below! 

Combi Boiler Service Costs

On average, a combi boiler will cost around £50 -  £100 for a one off service. You can also arrange a monthly cover that typically costs between £10 - £15. 

It’s essential to get your combi boiler serviced at least once a year, for the following reasons:

Reasons to service your boiler yearly.

Boiler being serviced.

​Find the Right Combi Boiler for Your Home

When it comes time to replace your old boiler, there is a great range of modern combi boilers to consider that will optimise your heating system and lower monthly running costs. 

Making sure you have the right new combi boiler involves keeping an estimation of your energy needs in mind. Advice from a professional heating engineer will help you find the ideal boiler size for your property. 

This involves some research into local traders that you can consult to assess your home's needs. This can take some considerable time and effort. Luckily, GreenMatch can help by connecting you with up to 4 local engineers who are equipped to offer the best advice for your new combi boiler installation. 

They will then offer you tailor-made installation quotes which you can compare to locate the best deal. Our network of trusted installers are all Gas Safe or OFTEC approved, and local to your area. Simply click the button below to begin! 

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Ciaran Wark
Written by Ciaran Wark, Copywriter

Ciaran is a copywriter at GreenMatch. He graduated in English Literature and has since focussed his pursuits on sustainability writing and research, in particular, for the commercialisation of sustainable aviation fuel. He has also written about sustainable travel and social justice issues for various online publications.