Last Updated on 23rd August 2022

How Much Is A Combi Boiler?

Your essential guide to combi boiler prices and sizes.

Combi is short for combination boiler, which refers to its ability to supply both central heating and hot water. Unlike System or Regular boilers which rely on a hot water storage cylinder, combi will produce hot water on demand. They are more efficient and they’re also great space-savers as they don’t need a water tank. If you currently have a big unsightly water tank in your basement or cupboard, you’ll be able to get rid of it once you convert your central heating system to combi.

Also the hot water tank no longer limits you as to how much hot water you can have. With a combi you now have an endless on-demand hot water supply and there is no standby energy loss as the hot water is only produced in the amount that is required. Storing water in conventional heating systems means part of the energy evaporates in thin air.

No matter how well the hot water cylinder is insulated, some heat will always escape. With a combination boiler there is no such problem because it heats up the flow of water as and when needed.

Combi boilers prices comparison and reviews of the best selling models for the year of 2019. If you’re not quite sure which combi boiler you should choose for your which combi boiler you should choose for your size house this article is not going to leave any stone unturned.

As a general rule for modern combi boilers, you can’t have a boiler that’s too big for your house because most recent models will provide heat output depending on demand. An upside of having a bigger boiler is that you get a more steady supply of hot water. It is, however, possible to make a mistake and choose a boiler that’s not sufficient for your home in which case you won’t have adequate heating and hot water. We don’t necessarily suggest you buy a bigger boiler than you need – the key is to choose an optimum size boiler.

HOW MUCH IS A COMBI BOILER IN 2019?Combi boiler prices in 2019 start from £545 and may exceed £3,000 for larger models. This estimate doesn’t include new boiler installation. Also, it’s not necessarily a good idea to base your buying decision purely on price. You need a compromise between the price, efficiency and heat output otherwise you may end up with a boiler that is not suited to your type of house – sounds like a costly mistake. To find out which boiler is right for your house, check this article, or scroll down for a general overview of heat output. Check out the data tables below for a full price comparison.

However, there are many other factors for choosing the right boiler such as:

Length of manufacturer’s warranty Length of installer’s workmanship warranty Efficiency and eco-friendliness Maximum heat output Dimensions The following comparison tables will give you a general idea of what size boiler is suitable for your house. They are sorted by combi boiler price but you can rearrange the tables by any other metric you’re interested in. For example, with the new smart home technology on the rise, many homeowners are looking for combi boilers that are compatible with the OpenTherm protocol so that they slot into their smart home environment easily. Also, another important factor is the dimensions of the boiler. Compact boilers are much easier to hide away in a kitchen cupboard.

All prices are given without the installation cost so that you can evaluate the actual cost of a boiler. Installation price depends on many different factors. Get a free quote from us to find out the total cost of your boiler replacement.


Heat OutputRatingWarrantyPriceDimensions, mmOpenTherm Compatible
Vokera Vision Boiler Vokera Vision 30 C26kW A7 years £590.00715 x 405 x 248Kit Required
Ravenheat Combi Boiler Ravenheat CS8025kW A2 years £590.00700 x 425 x 300Yes
Ferroli Modena Ferroli Modena HE Combi 27kW A5 years £599.00600 x 400 x 320Yes
Baxi 200 Baxi 200 Combi24kW A3 years £630.00700 x 395 x 279Yes
Biasi Inovia Biasi Inovia Combi 25kW A5 years £650.00803 x 400 x 350Yes
Intergas HRE Daikin D2CDN 24kw24kW A2 years £750.00590 x 400 x 256Yes
Intergas HRE Intergas HRE 24/1818kWA7 years £750.00590 x 450 x 240Yes
Potterton Promax Potterton Promax Combi 24kW A2 years £790.00750 x 450 x 345Yes
Glowworm Energy Glow-worm Energy Combi 25kW A7 years £790.00700 x 390 x 280 Yes
Viesmann 100 Viessmann Vitodens 100-W Combi 26kW A5 years £840.00700 x 400 x 350Yes
Vaillant Ecotec Vaillant ecoTEC Pro Combi 24kW A2 years £900.00720 x 440 x 338No
Worcester Bosch Worcester Bosch Greenstar Combi 25kW A5 – 12 yr£970.00690 x 390 x 280No
Ideal Vogue Ideal Vogue Max Combi 26kW A10 years £1,100.00740 x 445 x 330Kit Required