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

How much is a new gas boiler?

If you’re thinking about getting a new gas boiler for your home or property, then you might also be wondering how much it’ll cost you so you can set a budget and start planning. As simple as this question sounds, it’s actually very tricky to provide a simple and short answer as the costs of installing a new gas boiler alone varies greatly based on the parts needed, the amount of work required, your location, their availability as well as the company you hire for the project.

When it comes to purchasing a new gas boiler the price you’re expected to pay also depends on multiple influencing factors such as the type, brand as well as your most preferred gas boiler model. However, one thing you should have in mind is the fact that your gas boiler is right at the heart of your home or property and can be a complicated piece of machinery. As a result, you wouldn’t expect gas boilers to come cheap. Generally, it’s going to cost within the range of £500 to about £2,500 to get a new gas boiler. Therefore, it’s always advisable to obtain all necessary details and facts before you decide to purchase a replacement gas boiler.

This price range may seem too high as it’s usually a turn off for most homeowners. However, it’s worth noting that gas boiler replacement costs and gas boiler installation costs are, more often than not, compensated by the saving you’ll make off your utility bills - all thanks to the new and more energy efficient boiler you just installed in your home. And even more importantly, when it has been estimated that roughly half of the amount spent on energy on an annual basis depends on your boiler.

Can I stay at home while my gas boiler is being replaced?

When your boiler is being replaced you won’t have hot water or central heating. If you don’t mind this you can stay in your home, and use portable electric heaters if needed. Most installers undertake a power flush before installing a new boiler now and this can cause muck and debris from the pipework, so you may wish to get out of the way while this is happening!

How long does it take to replace a gas boiler?

In the UK, more than 50 percent of the money paid for utility bills is aimed at heating and hot water costs as stated by the Energy Saving Trust. This also means that when you settle for an old or ageing boiler, you’ll have to unnecessarily incur high utility bill in order to heat your home and have hot water on demand. In this kind of situation, the most effective and practical solution is to fit a new gas boiler in your home. This will provide you several benefits such as improved efficiency and reliability as well as reduced operating costs.

However, the only drawback here is the fact that removing your old gas boiler and replacing it with a new gas boiler isn’t a 5 minute task. And as you would have expected, like many other home improvement project there’s always an element of disruption that you’ll have to put into consideration when fitting a new gas boiler system. Good news is, with a qualified and experienced heating companies, these disruptions can be kept at a minimum. So now let’s take a look at how long it’ll take to replace a gas boiler depending on the type.

✓ An existing combi boiler upgrade - Installation times may vary, but typically the removal of an existing combi boiler and installation of a new one will usually be completed in a day - about four to six hours.

✓ Converting a regular to a combi boiler - Due to the fact that these type of project is usually labour intensive, it’ll take longer to complete - about 2 days.

✓ First time installation of new boiler to a home. This will usually take about 3 or more days because new pipes and other tasks need to the installation will be carried out.

How does a gas boiler work?

A boiler is simply the most important part of a central heating system as it generates the heat that warms up the home or property. Basically, the appliance or small furnace makes use of gas, LPG or oil in order to fuel its operation. However in the UK, most boilers are usually fuelled by natural gas which is supplied automatically from the national gas grid. And depending on how it operates, there are various types of boilers.

Typically, a gas central heating boiler will have multiple pipes entering from underneath. While one pipe supplies the boiler with gas from the mains gas supply, another pipe allows cold water to enter the boiler to be heated, the last pipe then enables hot water to exit the boiler so it can be distributed around the home.

✓ There are fuel jets and heat exchangers inside the boiler. When the heating is turned on, a valve is opened to allow the mains supply gas to enter a sealed combustion chamber in the boiler. There are multiple little valves which permit the entry of the gas before being ignited by an electric ignition switch. These jets heat a metal component in the boiler known as a heat exchanger which works to transfer the heat to the cold water pipe and heat up the water.

✓ Once the water has been heated to the target temperature, it’s then pumped through a circuit of pipe which runs around your home by an electric pump.

✓ The heated water enter each radiator, is then transmitted via a closed loop and radiates heat into each room.

✓ Once done travelling through all radiators, the water then returns to the boiler at which it must have been cooled. Therefore, the boiler will have to reheat following the same process before circulating. The water can only be drained by a professional Gas Safe engineer

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 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.

What is a condensing boiler?

Condensing boilers are the in-thing when it comes to modern heating systems in UK homes and across the globe for a good reason. This is primarily due to the fact that condensing boilers happens to be highly efficient as it enables the fuel you’re burning to heat up your home go a lot further. Having a new high efficiency condensing boiler rather than an old G-rated non condensing boiler will not only enhance your heating controls, but also save you a lot of money annually. In this article, we’re going to take you through the basics of a condensing boiler. Let’s take a closer look!

If you’re interested in getting a greener and more efficient boiler, you simply can’t afford to look beyond a high efficiency condensing boiler. This is purely due to the fact that these condensing boilers happens to make a better use of the heat they’re able to produce from burning fuels like oil or gas ( in other words, they require less heat from the burner, which makes them a lot more efficient).

So how does a condensing boiler work? Unlike a non-condensing heat-nly boiler, some heat will be wasted in form of hot gases which are released from the flue. Meanwhile a condensing boiler captures some of the heat from these gases and puts them to use for heating up water that’s coming back from your central heating system. As a result, it requires just a minimal heat from the burner which make the boiler more efficient.

You should take note that all new modern boilers are condensing boilers. Therefore if you’re planning to replace an old boiler with a new one, you’ll definitely be buying a new condensing boiler and benefit from all the efficiency and savings that comes with it.

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.

Worcester 2000 v Baxi 600 - Which Combi Boiler is Best

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...

Essex Gas Solutions

Based: in Clacton-on-sea, CO15

Our team are qualified to the highest standards & work in a clean today and professional manner at a...

Latest review

Trevor S., CO16
27th February 2023

Heating | Gas | Boiler Replacement in Clacton-on-Sea

Great service very quick response and very friendly.

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. ...

NEW World Plumbing & Heating

3 review(s)
Based: in Stockport, SK6 1JJ

NEW World Plumbing & Heating based in Stockport, offer services in Heating. They have an average rating of 4.9166666666667 from 3 review(s). See their latest 5 star review below

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 ...

Essex Gas Solutions Limited

2 review(s)
Based: in Clacton-on-sea, CO15 5AX

Our team are qualified to the highest standards & work in a clean today and professional manner at all times. Our Google reviews speak for themselves We are big enough to cope while being small enough to care

Gator Gas

2 review(s)
Based: in Poole, BH15 4BD

My name is Paul and I run Gator Gas , we have over 20 years experience , so for a fast reliable friendly service contact us for all your plumbing and heating needs

Similar Customer Enquiries for Combi boiler

19 Apr

Heating | Gas | Boiler Replacement

Bridgend - CF31

Enquiry from: Elaine C

Start Date: Less than one month

Combi boiler Lead

customer made an enquiry for gas boiler replacement and confirmed on the local quotes site they would like quotes from a heating engineer.mrs lives in the bridgend area and would like a call to discus...

Post a similar request >

17 Apr

Heating | Gas | Boiler Replacement

Barnoldswick - BB18

Enquiry from: Jonathan W

Start Date: Immediate

Call anytime Extent of work: New Boiler Type of building: Terraced Fuel: Mains gas Number of radiators: 18 Quote requested on boiler replacement

Post a similar request >

17 Apr

Heating | Gas | Boiler Replacement

Gillingham - ME7

Enquiry from: Catherine C

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 >

17 Apr

Heating | Gas | Boiler Replacement

St. Ives - TR26

Enquiry from: Neil H

Start Date: Immediate

customer made an online enquiry for gas boiler replacement and confirmed on sms and email they would like a call with a heating engineer to discuss prices.please call to arrange an appointment to quot...

Post a similar request >

16 Apr

Heating | Gas | Boiler Replacement

Great Yarmouth - NR30

Enquiry from: Charlie D

Start Date: Immediate

Call back anytime. Extent of work: New Boiler Type of building: Terraced Fuel: Mains gas Number of radiators: 6 Quote requested on boiler replacement

Post a similar request >

14 Apr

Heating | Gas | Boiler Replacement

Harrogate - HG1

Enquiry from: George S

Start Date: Immediate

we have a warm air system in our house from new install possibly 30 + years ago, need to update the boiler and other attachments that go with it. would request a technician to view and advise what is ...

Post a similar request >

11 Apr

Heating | Gas | Boiler Replacement

Highbridge - TA9

Enquiry from: Kiera B

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 >

10 Apr

Heating | Gas | Boiler Replacement

Newbury - RG14

Enquiry from: A V

Start Date: Immediate

Call anytime Extent of work: New Boiler Type of building: Flat Fuel: Mains gas Number of radiators: 10 Quote requested on boiler replacement

Post a similar request >

09 Apr

Heating | Gas | Boiler Replacement

Rochdale - OL16

Enquiry from: Ghulam M

Start Date: Immediate

customer made an enquiry for gas boiler replacement and confirmed on the local quotes site they would like quotes from a heating engineer.customer lives in the rochdale area and would like a call to d...

Post a similar request >

09 Apr

Heating | Gas | Boiler Replacement

Northampton - NN3

Enquiry from: Ibiso N

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 >

08 Apr

Heating | Gas | Boiler Replacement

London - W4

Enquiry from: C G

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 >

08 Apr

Heating | Gas | Boiler Replacement

Warrington - WA5

Enquiry from: Simeon S

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 >

08 Apr

Heating | Gas | Boiler Replacement

Bradford - BD5

Enquiry from: Mahamed B

Start Date: Immediate

call back anytime. extent of work: new boiler type of building: terraced fuel: mains gas number of radiators: 5 quote requested on boiler replacement

Post a similar request >

07 Apr

Heating | Gas | Boiler Replacement

Stockport - SK6

Enquiry from: BRIAN C

Start Date: Immediate

customer made an online enquiry for gas boiler replacement and confirmed on sms and email they would like a call with a heating engineer to discuss prices.please call to arrange an appointment to quot...

Post a similar request >

07 Apr

Heating | Gas | Boiler Replacement

Harrogate - HG1

Enquiry from: George S

Start Date: Immediate

we have a warm air system in our house from new install possibly 30 + years ago, need to update the boiler and other attachments that go with it. would request a technician to view and advise what is ...

Post a similar request >

05 Apr

Heating | Gas | Boiler Replacement

Dunstable - LU6

Enquiry from: Vishnu S

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 >

05 Apr

Heating | Gas | Boiler Replacement

London - SE28

Enquiry from: Folorunso A

Start Date: Immediate

Call anytime Extent of work: New Boiler Type of building: Flat Fuel: Mains gas Number of radiators: 6 Quote requested on boiler replacement

Post a similar request >

04 Apr

Heating | Gas | Boiler Replacement

Sittingbourne - ME9

Enquiry from: Katie P

Start Date: Immediate

We have a combi oil heater in the house but it it too small for our needs, we are upgrading the bathroom and need a boiler to match, do not want a pump heater though.

Post a similar request >

04 Apr

Heating | Gas | Boiler Replacement

Blackburn - BB1

Enquiry from: Abdul W

Start Date: Immediate

customer made an online enquiry for gas boiler replacement and confirmed on sms and email they would like a call with a heating engineer to discuss prices.please call to arrange an appointment to quot...

Post a similar request >

02 Apr

Heating | Gas | Boiler Replacement

Liverpool - L13

Enquiry from: Adam P

Start Date: Immediate

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

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