Combi Boiler Prices In 2021: Complete Cost Comparison Guide

Is this 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. Click the button below to get connected to local professionals.

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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.

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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

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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

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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

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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 click on button below – we don’t charge for this service and you don’t have to accept any of the quotes our partner installers give you.

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Click To Get QuotesAnd don’t forget our guide to the best boiler cover.