Combi Boiler Costs

Get New Boiler Prices Near You

Home > Heating Projects > Combi boiler

Average Combi boiler cost

The common cost of replacing your gas boiler is £2,994. Costs vary based on the type and brand of boiler you choose as well as the contractor you decide to go with. For example, a small local business may be able to offer a better price than a large national company as they will have fewer overheads. It' best to get a range of quotes from different boiler engineers so you can compare prices, reviews and references before going ahead.

Average price per Combi boiler job in 2025

Avg. price low

Avg. price low
£1,501

Avg. price

Avg. price
£2,994

Avg. price high

Avg. price high
£4,470

£4600

£3450

£2300

£1150

£0

Prices based on actual Combi boiler costs for your area, as reported by local LeadsDoWork members.

Combi boiler installation cost in your area 2025

Labour cost £1,750
Material cost £625
Waste removal £125
Time frame: 1-2 days

Advantages for Combi boiler

  • Lower gas bills each month with the more efficient modern combi-boilers
  • When we replace a boiler, the controls usually need an upgrade, too - Modern controls allow you to adjust the heating from your smart phone
  • Option to heat water and central heating seperately. Allowing you to just have hot water in the summer
  • No more waiting for the cylinder to heat up: there’ll always be hot water whenever you need it
  • Modern boilers are often smaller than older types. Give you extra space

Disadvantages for Combi boiler

  • Annual boiler services are highly recommend and essential if installed in a rental property
  • Carbon monoxide is produced during operation, faulty boilers could leak this into the property
  • If you don't have gas already then there will be an additional cost to connect gas to your home

Combi boiler Manufacturers

Combi boiler FAQs

What is a combi boiler?

A combination boiler, also referred to as a “combi boiler, delivers both domestic hot water and space heating in a single package so as to save space, and in a lot of cases, money. These great features makes the appliance a very popular choice in UK homes and in fact, it represents more than 50 percent of all new boilers fitted in the UK on a yearly basis.

Most modern and high efficiency combi boilers are usually stainless steel condensing boilers which normally features an in-built secondary heat exchanger to deliver domestic hot water to a home or property. What’s more? When it comes to the heating season or the cold months, the combi boiler will operated as required to heat a structure and offer hot water for showers, sinks as well as other hot water appliances around the house. And when it gets to the warm season or summer months, the combi boiler will only work when there’s a need for domestic hot water which also helps you save more money.

Combi boilers are able to provide domestic hot water in such a way that’s energy efficient due to two primary reasons - the combi units possess a very high operating efficiency and also have a low internal water volume. As a result, in during the hot summer when space heating is not required, you’ll only have to pay to heat up the hot water that you really need and not an entire tank.

Combi boilers also have the following benefits:

✓ Lower costs. Due to the combined nature of the boiler and the lack of tank in the roof space, the installation time and costs are at a minimum.

✓ Saves space in your home as it effectively combines a central heating boiler with a water heater into one unit.

How does the A-G gas boiler rating system work?

The A-G scale refers to the energy efficiency of your boiler. G-rated boilers are the least efficient, and give you less heat and hot water for your money. Installing an A-rated boiler will reduce your energy bills and carbon emissions. Don't compromise on cheaper, lower rated boilers, you will save yourself more money longer term with an A-rated model.

How long does a boiler last?

If you get the right size boiler for your home and you get it serviced regularly, your boiler could last up to 15 years. It may even last longer than this, but you’ll find that your boiler begins to become less efficient as it gets older. Also, as technology improves, a boiler older than 15 years may not be the most efficient one on the market.

How much is a british gas boiler?

If you’re looking for a reliable or reputable source for your new gas boiler, you definitely won’t find much better than British Gas. Using a big firm like British Gas comes with a plethora of benefits , but of course there are also some drawbacks, with the boiler prices being the main one and biggest turn off for most homeowners. However, just before we delve straight in to the price, let’s look at a thing or two about the big company.

The company, “British Gas are not a boiler manufacturer as you probably would have first imagined. They’re actually a company that specializes in the installation of boilers. As a result, they’re able to install just about any type of boiler you can imagine from any manufacturer. Be it a Worcester Bosch Greenstar 8000 Style or a Baxi 600, they’re able to provide you with the cost of having these boilers installed in your home or property.

Combi boilers are perfect boilers for space-saving and this makes them very popular on the market. They’re also very efficient when it comes to heating water instantly and warm your in few minutes. The price of a new British Gas combi boiler varies on a number of factors. Generally, the installation prices of combi boilers start from £1,800. Therefore, if British Gas are to be competitive with their pricing it should also be around this price.

However, if you have a large house with several rooms with a higher demand for hot water, British Gas will most likely recommend boilers such as Worcester Bosch 440CDi and the likes. Judging from other firms in the market, the price to have these types installed should be in excess of £3,000.

What size boiler do I need?

The size of boiler you need will depend on the size of your home, how many radiators and bathrooms you have and how many people live there. The boiler size refers to its output, which is measured in kilowatts (kW), rather than the actual dimensions. Speak to your boiler engineer about which boiler is suitable for you, as if you have more than one bathroom or a lot of people in your home a combi boiler might not suit you. Other boiler types such as system boilers or conventional boilers may be better suited to larger homes because they have bigger outputs.

How long does a gas boiler last?

When it comes to gas boilers, this is one of the most frequent questions that always pops up and for a good reason. When you invest a considerable amount of money to acquire and install a gas boiler in your home or property, it’s only reasonable not only to expect the boiler to warm up your home efficiently, but also to do so for a long period of time. If you’ve just bought or about to get a new gas boiler, it’s likely you won’t have to worry about getting a replacement for a lengthy period of time. Several gas boilers will last for anywhere between 10 to 15 years on the average. However in the event whereby you have an existing one that’s fast approaching the end of it’s useful life, then you should know the time go get a new gas boiler is just around the corner, and the earlier you make the purchase, the better (to avoid any surprise breakdowns that’ll leave your home super uncomfortable).

Just like any other home appliance, it’s a fact that an older gas boiler ( especially those that have been installed over a decade ago) are significantly less efficient that the new modern ones. When the older versions were manufactured is a completely different time to now as both technology and climate concerns are wide apart. So when your existing boiler is approaching the end of it’s useful life, it’ll be wise to start saving up to cover the cost of getting a new one. However, if it’s only about 5 years ago your boiler was installed, it’s highly likely to still be very efficient.

How do I re-pressurise a boiler?

Re-pressurising your boiler means that you allow more water to enter system via the filling loop. It can be easy to re-pressurise your boiler yourself. Always check your manual, but there are some simple steps you can take to restore pressure to your boiler:

• Switch off your boiler and let it cool completely

• Make sure both ends of your filling loop are attached

• Open both valves to allow cold water into the system – you’ll hear it start to move

• Look out for your pressure gauge to show 1.5 bar

• Close both valves

• Switch your boiler back on

• Undo both ends of your filling loop and remove it. Remember some water might come out, so be ready to catch some spillage!

How much is a new combi boiler?

If you’re thinking about getting a new combi boiler, you may be wondering just how much it’s going to cost so as to start making preparations as soon as possible. However, providing a precise cost for the acquisition and installation of a new combi boiler is simply impossible as combi boiler prices vary greatly in price - usually ranging between £1500 to about £3500 based on the brand of the combi boiler, the insurance or warranty, installation, your location as well as the size and power of the appliance. Due to the fact that combi boilers are compact units which doesn’t need a hot water cylinder or a cold water tank to produce heating and hot water for homes, it’s a very popular type of boiler that’s frequently used especially in the UK.

Combi boilers are also widely known to be the most energy efficient type of boiler because they are able to provide an instant supply of hot water anytime you turn on a tap. Combi boilers particularly perfect for flats and houses where space is limited as they have the ability to deliver instant heating and hot water without requiring any extra parts or components.

In the event whereby you’re about to choose a combi boiler for your home or property, it’s always advisable to compare models as well as prices from only the most reliable and sought after brands across the globe. Depending on the manufacturer, the overall quality of the boilers as well as their prices can differ. However, regardless of your budget, you’ll discover there are a plethora of combi boilers available in the market that’ll also suit your taste.

How Combi Boilers Work - Plumbing Tips

Our reviews

Average

Would highly recommend

Would highly recommend, they found me a firm which I was happy with a quote they give me and went ahead and had my job done within 2 days of enquiring.

Good easy way to find a selection of…

Good easy way to find a selection of trades you need all in one place.

Love LeadsDoWork it's a big part of my …

Love LeadsDoWork it's a big part of my Business I would recommend to anyone

Cordy Heating

Based: in Cwmbran, NP44

Cordy Heating is based in Cwmbran and have 2 positive reviews

Latest review

Alan J., CF62
3rd October 2024

Heating | Gas | Boiler Replacement in Barry

Unfortunately the local guides website didn’t allow for the correct request so we w...

Diligent Energy Solutions

Based: in Birmingham, B30

Here at Diligent Energy Solutions Limited, where excellence meets warmth. With a team of skilled pro...

Latest review

Mary B., B46
20th May 2024

Heating | Gas | Boiler Replacement in Birmingham

Good service very pleasant staff across the board would reconmend

Glow Green

Based: in Bournemouth, BH8

Glow Green is one of the UK's leading providers of energy efficient products that focus on the need ...

Latest review

Bernard A., WA4
3rd March 2023

Heating | Gas | Boiler Replacement in Warrington

Pleasant sales person and a decent quote given

Walsh Plumbing

Based: in Stevenage, SG1

Walsh Plumbing Ltd

We understand that buying a new boiler can be an expensive purchase, which is ...

Latest review

Rod C., MK41
25th September 2023

Heating | Gas | Boiler Replacement in Bedford

Attentive management: Sensible prices without quibbles re minor changes : Excellent p...

Hometech-Group

Based: in Chester, CH4

HomeTech is a company with 50 years of combined experience in gas engineering and plumbing. Our team...

Latest review

H., CH64
4th August 2023

Heating | Gas | Boiler Replacement in Neston

I would not hesitate in recommending this firm. 100% on every aspect of service and i...

Invictus Energy Group

Based: in St.helens, WA11

Invictus Energy Group are energy efficiency experts, helping North West households with:New Boilers ...

Latest review

Bernard A., WA4
3rd March 2023

Heating | Gas | Boiler Replacement in Warrington

Knowlegable engineer with a pleasant manner

Mac Gas

Based: in Bedworth, CV12

Mac Gas is based in Bedworth and have 1 positive reviews

Latest review

LIND S., LE7
31st July 2023

Heating | Gas | Boiler Replacement in Leicester

MacGas is a very honest company, accredited by Worcester-Bosch. I was offered quotes ...

Scofi Plumbing and Heating.

Based: in Worthing, BN12

Small family run company that really cares about you.
We offer finance on boilers with a wide rang...

Latest review

Barry W., BN16
31st March 2023

Heating | Gas | Boiler Replacement in Littlehampton

Efficiently solved a problem re piping. Left everything clear & tidy as they found it...

Future Boiler Services

Based: in Sheffield, S3

MOORPHS sole traders in continuous business for 32yrs, boiler and central are installers, head offic...

Latest review

Sandra M., S2
5th March 2023

Heating | Gas | Boiler Replacement in Sheffield

Good job completed quicklu

Rated Local heating engineers

Glowarm Central Heating LTD

57 review(s)
Based: in Mitcham, CR4 4BE

Glowarm is a friendly family run business which has been established for over 25 years and has grown to be one of London’s and the Home Counties leading central heating companies. We take pride in treating our clients on an individual basis, taking...

Walsh Plumbing Ltd

1 review(s)
Based: in Stevenage, SG1 5HR

Walsh Plumbing Ltd We understand that buying a new boiler can be an expensive purchase, which is why Walsh Plumbing strive to provide our customers with outstanding satisfaction in our boiler packages and installations. We are the experts in ou...

WarmZilla Limited

6 review(s)
Based: in Cardiff, CF10 3AG

The modern way to buy a new boiler Save yourself time and money buying your new boiler by choosing WarmZilla.

Cordy Heating

2 review(s)
Based: in Cwmbran, NP44 4SX

Cordy Heating based in Cwmbran, offer services in Heating. They have an average rating of 4 from 2 review(s). See their latest 3 star review below

Swale Heating LTD

20 review(s)
Based: in Sittingbourne, ME10 3SA

Customer service is something we care passionately about at Swale Heating – and always have. Whether you’re a domestic or business customer, our unparalleled attention to customer satisfaction ensures you’ll always experience service quality th...

Holland Gas Services Bournemouth Ltd

4 review(s)
Based: in Wimborne, BH14 0JR

At Holland Gas we specialise in boiler/heating service and repairs as well as installation. Our Engineers are also fully NVQ City & Guilds Qualified Plumbers. We are an honest, fair and reasonable company who are proud of our high customer service. ...

NCS Property Maintenance

6 review(s)
Based: in Hertford, SG14 1PL

Award Winning Boiler Installation services in Hertfordshire. Wide range of finance options available. Up to 10 Year Guarantees on Boiler Installations. At NCS, our high quality plumbing and heating services are carried out by a team of award-winning,...

Diligent Energy Solutions Limited

3 review(s)
Based: in Birmingham, B30 3JN

Here at Diligent Energy Solutions Limited, where excellence meets warmth. With a team of skilled professionals, where seamless boiler installations that prioritize efficiency and reliability. OUR VISION: To be the company choice for boiler inst...

Future Boiler Services

2 review(s)
Based: in Sheffield, S3 8GG

MOORPHS sole traders in continuous business for 32yrs, boiler and central are installers, head office CHESTERFIELD, we have offices and engineers throughout the East a midlands, Lincolnshire, Humberside, North Yorkshire and South Yorkshire Boiler s...

John Wilkinson Heating And Services LTD

178 review(s)
Based: in Warrington, WA3 5BE

In need of Heating Engineers in North West England? Well with over 30 years of experience, look no further! And when it comes to central heating, we understand that things should work seamlessly, which is why our customers are at the ethos of who we ...

Similar Customer Enquiries for Combi boiler

17 Feb

Heating | Gas | Boiler Replacement

Monmouth - NP25

Enquiry from: Andrew J

Start Date: Immediate

customer has a heating project they are looking to have done, specially they want quotes for gas boiler replacement. they are unsure of options so would like to discuss with a heating engineer.confirm...

Post a similar request >

17 Feb

Heating | Gas | Boiler Replacement

Leicester - LE3

Enquiry from: Sajad H

Start Date: Immediate

Customer made an enquiry online for a gas boiler replacement via one of our websites. Customer lives in Leicester area. Please call to arrange appointment and discuss options

Post a similar request >

16 Feb

Heating | Gas | Boiler Replacement

Staines-upon-Thames - TW19

Enquiry from: Nabila A

Start Date: Immediate

Customer living in Staines-upon-Thames area made an enquiry for new boiler quotes via one of our websites. Customer confirmed interest via , SMS at 15:33 Homeowner needs advice on the boiler make and ...

Post a similar request >

16 Feb

Heating | Gas | Boiler Replacement

Hyde - SK14

Enquiry from: Fintan J

Start Date: Immediate

Customer made an enquiry online for a gas boiler replacement via one of our websites. Customer lives in Hyde area. Please call to arrange appointment and discuss options

Post a similar request >

16 Feb

Heating | Gas | Boiler Replacement

Liverpool - L25

Enquiry from: Margaret S

Start Date: Immediate

customer is looking to replace their gas boiler. they are not sure what brand or model to go for so please call to discuss what options would be best for their home. gas boiler replacement supply and ...

Post a similar request >

15 Feb

Heating | Gas | Boiler Replacement

Sheffield - S14

Enquiry from: Has M

Start Date: Immediate

Customer made an enquiry online for a gas boiler replacement via one of our websites. Confirmed interest via phone at 20:39 Customer lives in Sheffield area. Please call to arrange appointment and dis...

Post a similar request >

14 Feb

Heating | Gas | Boiler Replacement

Bromley - BR1

Enquiry from: Martin P

Start Date: Immediate

Customer made an online enquiry for Gas Boiler Replacement and is waiting for a call. Confirmed interest via and needs advice on boiler models suitable for their home.

Post a similar request >

14 Feb

Heating | Gas | Boiler Replacement

Southend-on-Sea - SS2

Enquiry from: Robert D

Start Date: Immediate

Customer is looking for a new gas boiler. Confirmed interest via phone at 19:47 Unsure of the right boiler for their home so needs to discuss options. Please call to arrange an appointment

Post a similar request >

13 Feb

Heating | Gas | Boiler Replacement

Solihull - B92

Enquiry from: Mary R

Start Date: Immediate

customer has a heating project they are looking to have done, specially they want quotes for gas boiler replacement. they are unsure of options so would like to discuss with a heating engineer.confirm...

Post a similar request >

13 Feb

Heating | Gas | Boiler Replacement

Barking - IG11

Enquiry from: Afzal K

Start Date: Immediate

Call anytime. Extent of work: New Boiler Type of building: Semi-detached Fuel: Mains gas Number of radiators: 0 Quote requested on boiler replacement

Post a similar request >

13 Feb

Heating | Gas | Boiler Replacement

Rainham - RM13

Enquiry from: Molly M

Start Date: Immediate

Call anytime Extent of work: New Boiler Type of building: Flat Fuel: Mains gas Number of radiators: 5 Quote requested on boiler replacement

Post a similar request >

13 Feb

Heating | Gas | Boiler Replacement

Oldham - OL2

Enquiry from: David M

Start Date: Immediate

customer is looking for a new gas boiler. confirmed interest, sms at 05:58, email at 05:58 unsure of the right boiler for their home so needs to discuss options. please call to arrange an appointment ...

Post a similar request >

12 Feb

Heating | Gas | Boiler Replacement

London - N9

Enquiry from: Michel Silva S

Start Date: Immediate

Customer in the London area made an enquiry online for a new boiler and is waiting for a call. Confirmed interest. Please contact to arrange an appointment to discuss options for their home.

Post a similar request >

12 Feb

Heating | Gas | Boiler Replacement

Felixstowe - IP11

Enquiry from: Frank L

Start Date: Immediate

Call back anytime. Extent of work: New Boiler Type of building: Flat Fuel: Mains gas Number of radiators: 5 Quote requested on boiler replacement

Post a similar request >

11 Feb

Heating | Gas | Boiler Replacement

Bolton - BL5

Enquiry from: Joan O

Start Date: Immediate

Customer is looking for a new gas boiler. Confirmed interest Unsure of the right boiler for their home so needs to discuss options. Please call to arrange an appointment

Post a similar request >

11 Feb

Heating | Gas | Boiler Replacement

London - N19

Enquiry from: Turabi A

Start Date: Immediate

Customer is looking to have a new gas boiler installed. They are unsure if they have a system or a combiboiler. Please contact them to discuss what boiler would be best suited for their home.

Post a similar request >

11 Feb

Heating | Gas | Boiler Replacement

Cirencester, Fairford, Lechlade - GL7

Enquiry from: Richard H

Start Date: Immediate

Customer made enquiry for a gas boiler replacement in Cirencester, Fairford, Lechlade. They are unsure what brand to go for and would like advice. Please contact to appoint

Post a similar request >

11 Feb

Heating | Gas | Boiler Replacement

Edinburgh - EH5

Enquiry from: Da D

Start Date: Immediate

Are you the home owner of that property? - Yes. How old is your existing boiler? - -. What fuel does your current boiler run on ? - -. Do you require that to be replaced or repaired? - -. Do you want ...

Post a similar request >

11 Feb

Heating | Gas | Boiler Replacement

Kilgetty - SA68

Enquiry from: Richard S

Start Date: Immediate

Customer in the Kilgetty area made an enquiry online for a new boiler and is waiting for a call. Confirmed interest, SMS at 14:26. Please contact to arrange an appointment to discuss options for their...

Post a similar request >

11 Feb

Heating | Gas | Boiler Replacement

Widnes - WA8

Enquiry from: Sarah P

Start Date: Immediate

Customer is looking for a new gas boiler. Confirmed interest Unsure of the right boiler for their home so needs to discuss options. Please call to arrange an appointment

Post a similar request >

Local & reliable heating engineers near me

Tell us about your combi boiler project

Answer a few quick questions, so we can match you with local heating engineers who can help.

Find up to 4 heating engineers in your area

Get free, no-obligation local combi boiler quotes from 4 verified heating engineers working in your area.

Hire with confidence

Compare customer reviews, services and prices, and choose the right tradesperson for you.

Latest Combi boiler completed projects

  • Completed Combi boilerproject picture by Snappy Heating LTD
  • Completed Combi boilerproject picture by M.A.C. Heating Services