2022 Combi Boiler Prices – The Homeowner’s Guide

Combi boiler prices will start as low as £500 (price for the boiler only), up to £2,500 and beyond.

The cost of a new combi boiler will depend on the:

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

Below, we’ve covered current combi boiler prices for all units from 24kw-42kw. At the end of the article we’ve explained the combi boiler replacement quotes you should be expecting to receive.

Essentially, it boilers down to this…

If your looking for competitive combi boiler prices, look no further than HEATABLE. 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

Smaller houses and apartments will usually use a boiler in the 24kw-27kw range. That assumes 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 (shower and taps on at the same time), it’s likely you’ll need something different.

A new boiler in the low kw range is always going to be the cheapest. We’ve detailed a few popular combi boiler prices below.

Price (Boiler Only)


KW Output

Expected Price

Baxi Duo-Tec 24 (ErP)24kw£725
Vaillant ecoTec 2424kw£890
Worcester Greenstar 25I25kw£920
Ideal Logic Plus 2424kw£770

Price Inclusive Of Boiler, Materials And Labour

There’s a lot that goes into combi boiler prices than just the purchase of the boiler. 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 a typical installation including the cost of the new boiler, materials and labour to be in the £2,000 range, for small properties.

That said, you must learn about HEATABLE, an online boiler comparison website who invests in technology over sales people. Naturally, HEATABLE are getting great deals on Worcester Bosch boilers, you can get a fixed price online in around 90 seconds. Here’s the quote we just got:

Worcester Bosch Greenstar i from Heatable



Combi Boiler Prices For Medium Sized Houses

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. A more suitable size for your property is going to be in the 28-34kw range, and there’s plenty of choice.

Combi boiler prices in the 28kw-34kw range can be 10-30% more than the 24-27kw equivalents.

Price (Boiler Only)


KW Output

Expected Price

Baxi Duo-Tec 28 (ErP)28kw£850
Vaillant ecoTec 2828kw£900
Worcester Greenstar 30I30kw£1,050
Ideal Logic Plus 3030kw£850
Worcester Greenstar Classic 34CDI34kw£1,350

Cost Inclusive Of Boiler, Materials And Labour

The price in the 28kw-34kw will also need to include items like flue, a magnetic system filter and extentsions.

Expect a typical installation including the cost of the new boiler, materials and labour to be in the £2,200-£2,450 range.

Using the clickable online tool on HEATABLE, here’s the quote we just got for a 30kw boiler (you can get yours on-screen using their online form here):

HEATABLE Worcester Bosch Greenstar i 30kW

The price for your combi boiler will vary depending on the answers you provide on their clickable multiple choice survey.

Combi Boiler Prices For Large Houses

We’re getting to the high end of what a combi boiler can really do. Any bigger than a 4-5-bedroom property with 2 bathrooms and up to 20 radiators, and you’ll need something else, perhaps a system boiler (consult an engineer first).

Combi boiler prices in the 35kw-42kw range tend to be incredibly expensive, almost double that of the 24kw combi in some cases.

Price (Boiler Only)


KW Output

Expected Price

Baxi Duo-Tec Platinum 40 (ErP)40kw£1,200
Worcester Greenstar 38CDI38kw£1,550
Ideal Logic Plus 3535kw£980
Ideal Vogue 3535kw£1,190
Worcester Greenstar Classic 42CDI42kw£1,750


Cost Inclusive Of Boiler, Materials And Labour

The bigger the boiler, the higher the prices are going to be. For a top boiler at a reasonable price, we’d suggest spending 90 seconds and getting your fixed price on-screen via HEATABLE. Typically, they’re going to be on-par if not cheaper than local installers.

Combi Boiler Replacement Prices

The overall cost of combi boiler replacements factors in a range of different things such as:

  • Is the boiler in the same location, or does it have to be moved?
  • Is this a system upgrade (converting from a system boiler to a combi boiler)?
  • Does a magnetic system filter need to be installed?
  • Does the system have pipework that is currently up to Gas Safe standards?
  • Are extensions needed?

To save the complications, after account for the combi boiler price (boiler only), I’d expect to add on the following costs for a basic new boiler swap.

Boiler Size

Price Of Materials And Labour


As we mentioned above, some of the cheapest combi boiler prices available come via HEATABLE. Due to their connection to Worcester Bosch, their prices are extremely competitive.

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.

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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