Is 2020 the year for your household to invest a brand new combi boiler? Across the UK, well over one million homes and apartments will benefit from the warmth and from the hot water a new environmentally-friendly combi boiler will deliver this year. With the government proposing to ban all new gas boiler installations by 2025, the time you have to get one for your home may well be running out.
But, today, with so many different types of boiler and so many companies wanting to install your boiler for you, how do you compare boiler prices to get the best deal for you and your family?
In this article, HouseholdQuotes does all the legwork for you by revealing the cheapest combi boiler deals according to their level of output. Why is the output important? The output describes the amount of power used to heat up the water in your home and there are three main groups of boilers according to the output they provide.
We’ll show you the very best gas boiler prices according to output size, what it costs to install a boiler, and the additional extras you may need to spend money on to get the very best boiler for your home.
HouseholdQuotes works with a large number of experienced, Gas Safe-certified installers across the UK and, by filling in the form below, we can put you in touch with three or four suppliers local to you so that you can get their very latest combi boiler prices.
The cheapest combi boiler deals are secured by homeowners working with our partner installers with many service users reporting a difference of up to 40% between the cheapest and the most expensive quotes. Our service is free of charge and there’s no pressure or obligation on you to accept any of the quotes our partner installers provide you with. Fill in the form below to get connected to local professionals.
Why choose a combi boiler?
The two main types of boiler most commonly installed in UK homes are combination (combi) boilers and conventional (traditional) boilers.
Combi boilers are the more popular type of boiler as, unlike with conventional boilers, they don’t need a hot water tank to work. Combi boilers heat water up directly from the mains supply and it’s this instant heating of your mains water which gives homeowners as much hot water as they want on demand. With a conventional boiler, once the hot water tank is empty, you must wait for it to fill up again before hot water comes through your taps again.
Another big advantage of combi boilers, particularly given that UK homes are some of the smallest in the world, is their size – most people have them fitted snugly in their kitchen hidden away behind a cabinet door.
There are situations where an installer may recommend a conventional boiler if you have a particularly large home however, given recent development in technology, manufacture, and production, your installer is likely to recommend a combi boiler for your home or apartment.
Boiler comparison by output size
There are three main groupings of boiler by output and, in this article, we’ll show you the very latest supply-only quotes on quality-assured boilers together with an indication of the costs of installation. Those boiler groupings are:
- 24-27kw combi boiler prices
- 28-34kw combi prices
- 35kw+ boiler prices
Boilers by output size
When you install a new, state-of-the-art combi boiler, one of the most important and the quickest benefits your new boiler will deliver to you and your family other than on-demand heating and hot water is a substantial reduction in your gas bills.
The closer the output size of your chosen boiler to the actual needs of your household, the further your gas bills will reduce so, together with your installer, it’s really important to make sure that you choose the most suitable boiler for the job.
As we mentioned earlier, the three most installed combi boilers by output size fall into the following groupings:
24-27kw combi boilers
Best suited for small properties with up to ten radiators and one bathroom, the cost of supplying a 24-27kw combi boiler is between £475 and £1,425.
28-34kw combi boilers
28-34kw combi boilers are particularly suitable for medium-sized properties with 2 bathrooms and up to 15 radiators. You should budget between £500 and £2,800 for the boiler itself plus the cost of installation on top.
35kw+ combi boilers
For larger properties, a 35kw+ boiler will provide the right balance of heat, hot water, and gas bill savings – you should expect to put aside between £745 and £2,000 for the supply of a boiler of this power. They’re ideal for large properties with up to 20 radiators and which feature 2 or more bathrooms.
Combi boiler prices and installation
There are two main types of company in the combi boiler installation market – local companies and larger national companies. The biggest installer of combi boilers in the UK is British Gas – in fact, one of the most popular searches online for people in the market for combi boilers is “British Gas boiler prices.”
Deciding the company you trust and you want to install your boiler is important in both securing the best deal for you at the right price with an assured level of after-sales care in the rare event that things go wrong. Many local companies have upped their after-sales support in recent year whilst still remaining competitive on price.
Cheap combi boilers – compare
The price you pay for the actual boiler itself depends on a number of different and important factors and, in this article, we’re going to be looking at the current ranges from some of Britain’s best known and most respected manufacturers.
Those manufacturers are Potterton, Glow-worm, Ideal, Worcester Bosch, Valliant, Baxi, and Veismann. Each of these companies manufactures ranges of boilers across all the different output ranges – 24-27kw, 28-34kw, and 35kw+.
What happens if the wrong type of boiler is installed in your home? If you choose a boiler whose output does not provide the amount of heated water your home requires, it’s going to be difficult to get both your hot water and your radiators as warm as you want them. On the other hand, if your boiler has an output higher than you need, you’ll get all the heat and hot water you want at the temperatures you want them however, because the system is more powerful, you’ll end up paying higher gas bills than you need.
Another important thing to think about when installing a new boiler is the place in your house in which you’d like it installed. To help, on the tables we’ve included below, we’ve also included the dimensions in millimetres by height, width, and depth. We’ve also shown the flow rate for each type of boiler – that’s how much water your boiler can handle when demand in your home for hot water and for heating as its highest. If you have a lot of radiators or if the people in your home take a lot of baths or showers, you should ask your installer for advice on selecting a boiler with a higher flow rate.
Installation costs
In addition to paying for your boiler, you’ll also need to pay your fitter for the installation of your boiler. Below, we’ve included a general idea of the type of budget you’ll need for the installation:
| What you might see on your quote | Price range |
| Boiler installation cost | £630-£780 |
| Cost of moving pipes | £190-£310 |
| Mechanical flush before installation | £440-£535 |
| TOTAL | £1,260-£1,625 |
If you want to keep your current radiators but you want then moving to a different location in a particular room, there may be more to pay in excess of the guideline prices we’ve listed above. Moving the position of your radiators will also require your fitter to move your pipes for which you should budget between £190 and £310.
If your new boiler is replacing a very old boiler, your installer may recommend that he or she performs a mechanical flush on your system prior to fitting your new boiler. A mechanical flush gets rid of all the gunk in your heating system meaning that, when your new boiler installation has been completed and you start using it to provide heat to the radiators, you can better control the temperature output of each radiator wherever located in your home.
In general, one in five boiler installation quotes include a mechanical flush recommendation so you probably won’t have to budget for one. However, if one is recommended and you don’t take up the recommendation, your boiler will probably not be as efficient or controllable in the delivery of heating to the radiators around your home.
24-27kw combi boiler prices
For smaller homes, you should budget between £625 and £6,190 if you choose a boiler from Potterton, Glow-worm, Ideal, Worcester Bosch, Valliant, Baxi, or Veismann. Please remember to factor in an additional £1,260-£1,625 for installation costs.
| Manufacturer | Model | Height | Width | Depth | MaxFlow | Output (kw) | Rating | Price |
| Glow-worm | Easicom 24 | 740 | 480 | 338 | 9.8 l/min | 24.0 | B | £625 |
| Potterton | Performa Combi 24 Eco HE | 780 | 450 | 345 | 9.8 l/min | 24.0 | B | £640 |
| Glow-worm | Betacom2 24 | 900 | 500 | 390 | 9.8 l/min | 24.0 | A | £640 |
| Glow-worm | Flexicom 24cx | 700 | 390 | 280 | 9.85 l/min | 24.0 | A | £650 |
| Ideal | Logic Combi 24 | 700 | 395 | 278 | 9.9 l/min | 24.0 | B | £655 |
| Potterton | Gold Combi 24 HE A | 780 | 450 | 345 | 9.8 l/min | 24.0 | A | £690 |
| Potterton | HeatmaCombi 24 HE | 780 | 450 | 345 | 9.8 l/min | 24.0 | A | £720 |
| Ideal | Logic Combi ESP1 24 | 830 | 395 | 278 | 10.7 l/min | 24.0 | A | £725 |
| Baxi | Neta-tec Combi 24 GA | 700 | 390 | 290 | 9.8 l/min | 24.0 | A | £730 |
| Baxi | Duo-tec Combi 24 HE A | 780 | 450 | 345 | 9.8 l/min | 24.0 | A | £740 |
| Glow-worm | Ultracom2 24cxi | 726 | 418 | 346 | 10.4 l/min | 24.0 | A | £740 |
| Baxi | Duo-tec Combi 24 GA | 763 | 450 | 345 | 9.8 l/min | 24.0 | A | £755 |
| Worcester Bosch | Greenstar 24i Junior | 710 | 400 | 330 | 9.8 l/min | 24.0 | A | £765 |
| Potterton | Titanium Combi 24 | 780 | 450 | 345 | 9.8 l/min | 24.0 | A | £805 |
| Baxi | Neta-tec Plus Combi 24 GA | 700 | 390 | 290 | 9.8 l/min | 24.0 | A | £825 |
| Ideal | Logic+ Combi 24 | 700 | 395 | 278 | 9.9 l/min | 24.0 | A | £880 |
| Valliant | ecoTEC Pro 24 | 720 | 440 | 335 | 9.4 l/min | 24.0 | B | £885 |
| Baxi | Platinum Combi 24 HE A | 780 | 450 | 345 | 9.8 l/min | 24.0 | A | £885 |
| Valliant | ecoTEC Plus 824 | 720 | 440 | 335 | 9.4 l/min | 24.0 | B | £965 |
| Worcester Bosch | Greenstar 25Si | 710 | 400 | 330 | 10.2 l/min | 25.0 | A | £850 |
| Veismann | Vitodens 100-W Combi 26 | 725 | 400 | 340 | N/A | 26.0 | A | £845 |
| Ideal | Vogue Combi 26 | 740 | 445 | 330 | 10.6 l/min | 26.0 | A | £945 |
| Ideal | Vogue Combi 26 | 830 | 395 | 278 | 10.7 l/min | 26.0 | A | £980 |
| Ideal | Logic Code Combi ES 26 | 830 | 395 | 278 | 10.7 l/min | 26.0 | A | £1,000 |
| Veismann | Vitodens 200-W Combi 26 | 850 | 450 | 360 | N/A | 26.0 | A | £1,150 |
| Veismann | Vitodens 111-W DHW Storage 26 | 900 | 600 | 480 | N/A | 26.0 | A | £1,520 |
| Veismann | Vitodens 222-F 26 | 1425 | 600 | 595 | N/A | 26.0 | A | £2,515 |
| Veismann | Vitodens 242-F 26 | 1875 | 600 | 595 | N/A | 26.0 | A | £6,190 |
28-34kw combi boiler prices
For medium-sized properties, the current range of 28-34kw combi boilers from Potterton, Glow-worm, Ideal, Worcester Bosch, Valliant, Baxi, and Veismann include:
| Manufacturer | Model | Height | Width | Depth | MaFlow | Output (kw) | Rating | Price |
| Glow-worm | Easicom 28 | 740 | 480 | 338 | 11.5 l/min | 28.0 | B | £660 |
| Glow-worm | Betacom2 28 | 900 | 500 | 390 | 11.2 l/min | 28.0 | A | £680 |
| Potterton | Gold Combi 28 HE A | 780 | 450 | 345 | 11.5 l/min | 28.0 | A | £755 |
| Potterton | HeatmaCombi 28 HE | 780 | 450 | 345 | 11.5 l/min | 28.0 | A | £790 |
| Baxi | Neta-tec Combi 28 GA | 700 | 390 | 290 | 11.5 l/min | 28.0 | A | £815 |
| Baxi | Duo-tec Combi 28 HE A | 780 | 450 | 345 | 11.5 l/min | 28.0 | A | £825 |
| Potterton | PromaCombi 28 HE Plus A | 780 | 450 | 345 | 11.5 l/min | 28.0 | A | £840 |
| Worcester Bosch | Greenstar 28i Junior | 710 | 400 | 330 | 11.4 l/min | 28.0 | A | £855 |
| Potterton | Titanium Combi 28 | 780 | 450 | 345 | 11.5 l/min | 28.0 | A | £865 |
| Valliant | ecoTEC Pro 28 | 720 | 440 | 335 | 11.5 l/min | 28.0 | B | £875 |
| Baxi | Duo-tec Combi 28 GA | 763 | 450 | 345 | 11.5 l/min | 28.0 | A | £875 |
| Baxi | Neta-tec Plus Combi 28 GA | 700 | 390 | 290 | 11.5 l/min | 28.0 | A | £935 |
| Baxi | Platinum Combi 28 HE A | 780 | 450 | 345 | 11.5 l/min | 28.0 | A | £950 |
| Worcester Bosch | Greenstar 28CDi Compact | 680 | 390 | 280 | 11.4 l/min | 28.0 | A | £975 |
| Veismann | Vitodens 050-W 29 | 700 | 400 | 350 | 12.1 l/min | 29.0 | A | £860 |
| Worcester Bosch | Greenstar 29CDi Classic | 760 | 440 | 360 | 12.3 l/min | 29.0 | A | £1,020 |
| Worcester Bosch | Greenstar Highflow 440CDi | 850 | 600 | 600 | 20 l/min | 29.0 | A | £1,710 |
| Glow-worm | Flexicom 30cx | 700 | 390 | 280 | 12.3 l/min | 30.0 | A | £695 |
| Potterton | Performa Combi 30 HE | 780 | 450 | 345 | 12.1 l/min | 30.0 | B | £705 |
| Ideal | Logic Combi 30 | 700 | 395 | 278 | 12.4 l/min | 30.0 | B | £745 |
| Glow-worm | Ultimate 30c | 740 | 418 | 338 | 12.5 l/min | 30.0 | B | £750 |
| Ideal | Logic Combi ESP1 30 | 830 | 395 | 278 | 13.4 l/min | 30.0 | A | £815 |
| Glow-worm | Ultracom2 30cxi | 726 | 418 | 346 | 12.5 l/min | 30.0 | A | £875 |
| Worcester Bosch | Greenstar 30Si | 710 | 400 | 330 | 12.3 l/min | 30.0 | A | £955 |
| Ideal | Logic+ Combi-30 | 700 | 395 | 278 | 12.4 l/min | 30.0 | A | £965 |
| Veismann | Vitodens 100-W Combi 30 | 725 | 400 | 340 | N/A | 30.0 | A | £1,045 |
| Veismann | Vitodens 200-W Combi 30 | 850 | 450 | 360 | N/A | 30.0 | A | £1,220 |
| Worcester Bosch | Greenstar Highflow 550CDi | 850 | 600 | 600 | 14.3 l/min | 30.0 | A | £2,035 |
| Valliant | ecoTEC Plus 831 | 720 | 440 | 335 | 12.7 l/min | 31.0 | B | £1,060 |
| Ideal | Vogue Combi 32 | 740 | 445 | 330 | 13.1 l/min | 32.0 | A | £1,055 |
| Worcester Bosch | Greenstar 32CDi Compact | 680 | 390 | 280 | 13.1 l/min | 32.0 | A | £1,085 |
| Ideal | Vogue Combi 32 | 830 | 395 | 278 | 13.4 l/min | 32.0 | A | £1,095 |
| Valliant | ecoTEC Exclusive 832 | 800 | 480 | 450 | 12.9 l/min | 32.0 | B | £1,225 |
| Potterton | Gold Combi 33 HE A | 780 | 450 | 345 | 13.5 l/min | 33.0 | A | £820 |
| Baxi | Neta-tec Combi 33 GA | 700 | 390 | 290 | 13.5 l/min | 33.0 | A | £850 |
| Potterton | HeatmaCombi 33 HE | 780 | 450 | 345 | 13.5 l/min | 33.0 | A | £865 |
| Baxi | Duo-tec Combi 33 HE A | 780 | 450 | 345 | 13.5 l/min | 33.0 | A | £900 |
| Potterton | Titanium Combi 33 | 780 | 450 | 345 | 13.5 l/min | 33.0 | A | £925 |
| Potterton | PromaCombi 33 HE Plus A | 780 | 450 | 345 | 13.5 l/min | 33.0 | A | £950 |
| Baxi | Duo-Tec Combi 33 GA | 763 | 450 | 345 | 13.5 l/min | 33.0 | A | £965 |
| Baxi | Neta-tec Plus Combi 33 GA | 700 | 390 | 290 | 13.5 l/min | 33.0 | A | £1,035 |
| Baxi | Platinum Combi 33 HE A | 780 | 450 | 345 | 13.5 l/min | 33.0 | A | £1,045 |
| Ideal | Logic Code Combi ES 33 | 830 | 395 | 278 | 13.4 l/min | 33.0 | A | £1,300 |
| Worcester Bosch | Greenstar 34CDi Classic | 760 | 440 | 360 | 14.3 l/min | 34.0 | A | £1,060 |
35+kw combi boiler prices
The range of 35+kw combi boilers Potterton, Glow-worm, Ideal, Worcester Bosch, Valliant, Baxi, and Veismann, suitable for use in large properties, include:
| Manufacturer | Model | Height | Width | Depth | MaFlow | Output (kw) | Rating | Price |
| Glow-worm | Ultimate 35c | 740 | 418 | 338 | 14.6 l/min | 35.0 | B | £800 |
| Ideal | Logic Combi 35 | 700 | 395 | 278 | 14.5 l/min | 35.0 | B | £850 |
| Veismann | Vitodens 050 W 35 | 707 | 400 | 350 | 14 l/min | 35.0 | A | £860 |
| Glow-worm | Flexicom 35cx | 700 | 390 | 280 | 14.4 l/min | 35.0 | A | £880 |
| Ideal | Logic Combi ESP1 35 | 830 | 395 | 278 | 15.7 l/min | 35.0 | A | £930 |
| Glow-worm | Ultracom2 35cxi | 726 | 418 | 346 | 14.6 l/min | 35.0 | A | £975 |
| Ideal | Logic+ Combi 35 | 700 | 395 | 278 | 14.5 l/min | 35.0 | A | £1,010 |
| Veismann | Vitodens 100-W Combi 35 | 700 | 400 | 350 | N/A | 35.0 | A | £1,105 |
| Veismann | Vitodens 200-W Combi 35 | 850 | 450 | 360 | N/A | 35.0 | A | £1,295 |
| Glow-worm | Ultracom2 35 store | 890 | 470 | 561 | 19.1 l/min | 35.0 | A | £1,310 |
| Veismann | Vitodens 111-W DHW Storage 35 | 900 | 600 | 480 | N/A | 35.0 | A | £1,630 |
| Veismann | Vitodens 222-F 35 | 1625 | 600 | 595 | N/A | 35.0 | A | £2,605 |
| Worcester Bosch | Greenstar 36CDi Compact | 680 | 390 | 280 | 14.7 l/min | 36.0 | A | £1,205 |
| Valliant | ecoTEC Plus Storage 937 | 720 | 440 | 597 | 15.2 l/min | 37.0 | B | £1,205 |
| Valliant | ecoTEC Plus 837 | 720 | 440 | 403 | 15.2 l/min | 37.0 | B | £1,275 |
| Worcester Bosch | Greenstar 38CDi Classic | 760 | 440 | 360 | 16.4 l/min | 38.0 | A | £1,275 |
| Valliant | ecoTEC Exclusive 838 | 800 | 480 | 450 | 15.2 l/min | 38.0 | B | £1,305 |
| Ideal | Logic Code Combi ES 38 | 830 | 395 | 278 | 15.7 l/min | 38.0 | A | £1,330 |
| Baxi | Duo-tec Combi 40 HE A | 780 | 450 | 345 | 16 l/min | 40.0 | A | £940 |
| Potterton | Titanium Combi 40 | 780 | 450 | 345 | 16 l/min | 40.0 | A | £995 |
| Baxi | Duo-Tec Combi 40 GA | 763 | 450 | 345 | 16.4 l/min | 40.0 | A | £1,015 |
| Baxi | Platinum Combi 40 HE A | 780 | 450 | 345 | 16.4 l/min | 40.0 | A | £1,150 |
| Ideal | Vogue Combi 40 | 740 | 445 | 330 | 16.4 l/min | 40.0 | A | £1,180 |
| Ideal | Vogue Combi 40 | 830 | 395 | 278 | 15.7 l/min | 40.0 | A | £1,220 |
| Worcester Bosch | Greenstar 42CDi Classic | 760 | 440 | 360 | 17.1 l/min | 42.0 | A | £1,435 |
Choosing an installer to fit your combi boiler
While you should get as wide a range of quotes as you can from both local and national installers, bear in mind that you may save up to 40% on the cost of your boiler and its installation by choosing a local company. That’s because they employ fewer people and they have far smaller overheads that the big national firms.
HouseholdQuotes helps homeowners ready to go ahead with a new boiler installation for their property by helping them lock in the savings by encouraging competition between these companies. When we pass a homeowner’s details onto them, these installers know that they are one of three or four companies competing for your order. They don’t want to lose out so they’ll often do the work for a substantial discount so that they can keep their fitting teams busier. All of our installers are registered with Gas Safe and they have a proven trading history – ideal for your peace of mind so that you know you’ve chosen the right people for the job.
To save up to 40% on the cost of your new boiler, please fill in the form at the top of this page – we don’t charge for this service and you don’t have to accept any of the quotes our partner installers give you.
And don’t forget our guide to the best boiler cover.