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2023 Combi Boiler Prices – The Homeowner’s Guide

Understanding the logic behind combi boiler prices can be difficult; needlessly so, in fact, in our humble opinion.

That’s why we’ve put together this handy guide. Here, we’ll not only walk you through the prices of the most popular combis in 2024; we’ll explain where all these figures are coming from and what they’re based on.


How Much Do Combi Boilers Cost in 2024?

At the moment, you can get a combi boiler for as little as £500 and up to £2,500 and beyond — that’s boiler only (no installation).

New combi boiler costs will depend on:

  • kW output you need
  • Popularity of the manufacturer
  • Warranty provided
  • Installation costs

Below, we’ve covered current combi gas boiler prices for units sized between 24kW and 42kW.

If your looking for competitive combi boiler prices, Heatable is a good place to start They’re a new online boiler comparison company focusing on technology to reduce costs for their clients. And that means the installation prices for combi boilers they offer are up there with the most competitive.

Combi Boiler Prices For Small Houses

Baxi combi boilersSmaller houses and apartments will usually need a boiler in the 24kW-27kW range.

That’s assuming that you only have 1 bathroom and no more than 10 radiators.

If you have more than 1 bathroom, more than 10 radiators, or have high demand for hot water — i.e. you run several shower and taps at the same time — you’ll probably want to consider a different boiler type. Heat-only boilers or system boilers may be a more fitting choice, as they can supply larger volumes of hot water at a higher flow rate than a combi can.

Note, however, that system boilers require a hot wate cylinder to operate, whilst regular boilers also need a water storage tank.

Prices — Boiler Only

A new combi boiler costs less if it’s in the low kW range, such as 24kW-27kW. Below, we’ve detailed prices a few popular combi boiler models:

Boiler Model

Heat Output (kW)

Boiler Cost

Baxi Duo-Tec 24 (ErP) 24kW £800
Vaillant ecoTec 24 24kW £1,050
Worcester Greenstar 4000 25kW £1,100
Ideal Logic Plus 24 24kW £800

Boiler Installation Cost — Prices Including Boiler, Materials, and Labour

There’s a lot more that goes into combi boiler prices than the new boiler cost alone. You’ll need a flue, a magnetic system filter, extensions, and there’s a chance the gas engineer will need to re-route or move pipe-work.

Expect typical combi boiler installations, including the cost of a new boiler, materials, and labour, to be in the neighbourhood of £2,200 for small properties — if you use your local installers.

That said, you may be able to get lower boiler installation prices from Heatable, an online installation company. Thanks to Heatable’s low overhead, they’re able to offer better deals than many national and local boiler trades. You can get your own boiler replacement cost quotes by filling in Heatable’s anonymous questionnaire.

Worcester Bosch Greenstar 4000

Combi Boiler Prices For Medium-Sized Houses

Ideal combi boilers

If you have a property with 2-4 bedrooms, 1-2 bathrooms and up to 15 radiators, you’ll be looking at a larger boiler than 24kW-27kW. Boilers in the 28kW-34kW range will be better-suited to meet your hot water pressure and central heating system demands; and, luckily, there’s plenty of choice.

Prices — Boiler Only

In terms of pricing, note that a gas combi boiler the 28kW-34kW range can cost 10-30% more than the 24kW-27kW equivalents.

Boiler Model

Heating Output (kW)

Boiler Pricing

Baxi Duo-Tec 28 (ErP) 28kW £950
Viessmann Vitodens W-100 30kW £1,400
Worcester Greenstar 4000 30kW £1,200
Ideal Logic Plus 30 30kW £950
Worcester Greenstar Classic 34CDi 34kW £1,400

Boiler Installation Costs — Inclusive of Boiler, Materials and Labour

The total combi boiler cost, fitted, for a 28kW-34kW gas boiler will also need to include items like the flue, extensions, and the magnetic system filter.

Altogether, you can expect installation costs including the price of the new boiler, materials, and labour to be in the £2,200-£2,450 range.

You can get your on-screen from Heatable using their online form here.


The fixed-price quotes you get for boiler replacement costs will vary depending on the answers you provide on Heatable’s clickable multiple choice survey.

Prices For Combi Boilers — Large Houses  Worcester Bosch combi boilers

We’re reaching the limits of what combination boilers can really do. Anything larger than a 4-5-bedroom property with 2 bathrooms and up to 20 radiators, and you’ll definitely need another boiler type. Again, a system or heat only boiler may be your best option to meet high demand for hot water pressure.

Prices — Boiler Only

One thing to note is that these larger combi boilers’ prices tend to be incredibly high — almost double those of a typical 24kW combi, in some cases. In fact, you may find that system boiler costs are lower — so that’s a viable replacement alternative to consider, especially if you have a system boiler already.

Boiler Models

Heating Output (kW)

Boiler Prices

Baxi Duo-Tec Platinum 40 (ErP) 40kW £1,200
Worcester Greenstar 38CDI 38kW £1,550
Ideal Logic Plus 35 35kW £980
Ideal Vogue 35 35kW £1,190
Worcester Greenstar Classic 42CDi 42kW £1,750

Installation Costs — Inclusive of Boiler, Materials, and Labour

The higher the boilers’ output, the higher the boilers’ prices.

To find the best combi boiler at a reasonable price, we’d suggest spending 90 seconds to get a fixed price on-screen via Heatable. Typically, their prices will be on-par, or cheaper, than those of local installers.

Combi Boiler Replacement Prices

The overall cost of combi boiler replacements depends on a host of different factors, such as:

  • New boiler location — Is the boiler in the same location, or does it have to be moved?
  • Boiler type — Is this a system conversion, i.e. are you converting from a system or back boiler to a combi boiler?
  • Filters included in installation — Does a magnetic system filter need to be installed?
  • Pipework compliance — Does the system have pipework that is currently up to Gas Safe standards?
  • Are extensions needed?
  • Which installer you’re using — Large, national companies like British Gas typically cost more than local trades.

To translate all this into pounds and pence, apart from the boiler cost, I’d expect to pay the following extra costs for a basic new boiler swap:

Boiler Size (kW)

Boiler Price — Materials And Labour

24-27kW £700-£900
28kw-34kW £800-£1,000
35kw-42kW £850-£1,100

As we mentioned above, some of the lowest combi boiler prices come from Heatable, partly thanks to their low overhead.

You can jump straight on to their site and get your price here.

Or, you can read our review of Heatable and their combi boiler prices.

FAQs on Combination Boiler Prices

Before we conclude, let’s go through some common questions about combi boiler prices.

Which combi boiler is the best?

If you’re looking for overall quality and value, the Worcester Greenstar 4000 combi boiler range has stellar, mid-range options for properties of different sizes. The Greenstar range has received multiple Which? Best Buy awards.

Viessmann’s Vitodens range is ruthlessly efficient and surprisingly affordable, given the manufacturer’s reputation for quality and reliability.

And if you’re looking for a premium combi boiler with a “budget” price tag, Ideal’s Logic Plus range is certainly worth considering.

How many years should a combi boiler last?

A modern combination boiler from a quality manufacturers should be expected to last around 15 years, provided that you get it serviced annually.

That said, all boilers suffer from wear and tear with age, so after a certain point, they do start to malfunction.

A boiler warranty usually gives owners a good indication of how long a boiler wil last.

For example, boilers with a 2-year warranty typically start showing signs of wear and tear far sooner than those with 10-year coverage.

Is a Baxi boiler any good?

Yes — Baxi boilers are good. Baxi are definitely considered a “premium” brand, but interestingly enough, their boilers are quite reasonably priced.

If you’re thinking about getting a Baxi combi, you can read our review of the Baxi 600 range here.

What is the average life of a Worcester Bosch Boiler?

You can expect a Worcester Bosch boiler to last between 12-15 years, although plenty have made it far longer. To ensure your Worcester’s longevity, you should service your boiler annually and install a magnetic and limescale filters.

Of course, even quality boilers can succumb to wear-and-tear, so make sure that your Worcester is covered by a long warranty before you purchase it.

How often should a boiler be serviced?

You should get a Gas Safe heating engineer to service your boiler every year. Not only is annual service a precondition on most manufacturers’ warranties, but it’s also the best thing you can do to prolong your boiler’s service life.

Is a Worcester boiler any good?

Yes — Worcester Bosch boilers are excellent.

Worcester are widely considered to be one of the best boiler manufacturers on the market, and the company certainly deserves the rosy reputation. The boiler brand is known for quality, reliability, efficiency, and outstanding aftercare.

What’s more, unlike most boiler brands, Worcester cover their boilers with a guarantee. Unlike a warranty, which covers some of the parts and labour cost associated with repairs, Worcester’s coverage actually guarantees their product completely. As an owner, you wouldn’t even have to pay the call out fee to get Worcester’s technician to come and repair your appliance.

What’s Next?

Still got questions? Drop a comment below and we’ll get back to you as soon as possible.



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