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!
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 |
---|---|
Avg. price | Avg. price |
Avg. price high | Avg. price high |
£4600
£3450
£2300
£1150
£0
Combi boiler installation cost in your area 2025
Labour cost | £1,750 | |
Material cost | £625 | |
Waste removal | £125 |
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
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.
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.
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.
If your boiler is making strange noises or smells, or doesn’t seem to be working properly, it may need replacing. Boilers usually last about 10-15 years. Even if your boiler is working normally, it’s worth replacing when it gets this old. An annual check will establish if there are terminal problems with a boiler that cannot be fixed.
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.
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!
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.
CHOOSING THE BEST BOILER... for us
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
Latest combi boiler reviews

Glowarm Central Heating
Based: in Mitcham, CR4Glowarm is a friendly family run business which has been established for over 25 years and has grown...
Latest review
Michael G., KT4
20th June 2025
Heating | Gas | Boiler Replacement in Worcester Park
Very friendly good advice given

WarmZilla
Based: in Cardiff, CF10The modern way to buy a new boiler
Save yourself time and money buying your new boiler by choosing ...
Latest review
Michael G., KT4
20th June 2025
Heating | Gas | Boiler Replacement in Worcester Park
Still to re contact

M.A.C. Heating Services
Based: in Shepperton, TW17Professional, sole trader, with vast knowledge and experience of domestic central heating systems. I...
Latest review
Michael G., KT4
20th June 2025
Heating | Gas | Boiler Replacement in Worcester Park
Still to re contact

Cordy Heating
Based: in Cwmbran, NP44Cordy 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, B30Here 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, BH8Glow Green is one of the UK's leading providers of energy efficient products that focus on the need ...

Walsh Plumbing
Based: in Stevenage, SG1Walsh 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, CH4HomeTech 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, WA11Invictus Energy Group are energy efficiency experts, helping North West households with:New Boilers ...

Mac Gas
Based: in Bedworth, CV12Mac 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 ...
Rated Local heating engineers

Glowarm Central Heating LTD
Based: in Mitcham, CR4 4BEGlowarm 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...

M.A.C. Heating Services
Based: in Shepperton, TW17 9BEProfessional, sole trader, with vast knowledge and experience of domestic central heating systems. Installing new gas boilers daily e.g. gravity fed to combi conversions, combi to combi etc..warm air system conversions to include installation of new ...

Walsh Plumbing Ltd
Based: in Stevenage, SG1 3EEWalsh 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...

NEW World Plumbing & Heating
Based: in Stockport, SK6 1JJNEW 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

Central Energy Residential LTD
Based: in Motherwell, ML3 6DACentral Energy Heating are experts in boilers, central heating and hot water solutions. We are fully qualified in renewable energy technologies and have been operating in the domestic and commercial heating markets for over 15 years. With head office...

Cordy Heating
Based: in Cwmbran, NP44 4SXCordy 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

Holland Gas Services Bournemouth Ltd
Based: in Wimborne, BH14 0JRAt 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. ...

John Wilkinson Heating And Services LTD
Based: in Warrington, WA3 5BEIn 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
Based: in Clacton-on-sea, CO15 5AXOur 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
Based: in Poole, BH15 4BDMy 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
Heating | Gas | Boiler Replacement
Hook - RG27
Enquiry from: Doug S
Start Date: Immediate
customer requested quotes for gas boiler replacement from a heating engineer around hook. they are considering a couple of projects at the moment.call anytime to arrange appointment to discuss. the in...
Heating | Gas | Boiler Replacement
Skelmersdale, Wigan - WN8
Enquiry from: M
Start Date: Immediate
New Combi Boiler Installation Where do you need it? *** What type of property is this for? House What boiler type would you like? Combination (combi) Where would you like the boiler located? I...
Heating | Gas | Boiler Replacement
Ammanford - SA18
Enquiry from: David E
Start Date: Immediate
Reconditioned combi oil boiler
Heating | Gas | Boiler Replacement
Dundee - DD1
Enquiry from: Ajit T
Start Date: Immediate
Need quote for installing a complete gas central heating system for 2 bedrooms, living room, small bathroom, hallway and kitchen. Combi boiler or conventional boiler prices for comparison.
Heating | Gas | Boiler Replacement
London - SE28
Enquiry from: Abu K
Start Date: Immediate
Call back anytime. Extent of work: New Boiler Type of building: Semi-detached Fuel: Mains gas Number of radiators: 9 Quote requested on boiler replacement
Heating | Gas | Boiler Replacement
Prescot - L34
Enquiry from: Denise M
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
Heating | Gas | Boiler Replacement
Crawley - RH11
Enquiry from: Ashraf M
Start Date: Immediate
Call any time. Extent of work: New Boiler Type of building: Terraced Fuel: Mains gas Number of radiators: 0 Quote requested on boiler replacement
Heating | Gas | Boiler Replacement
Worcester Park - KT4
Enquiry from: Michael G
Start Date: Immediate
Combi Boiler replaced in upstairs cupboard
Heating | Gas | Boiler Replacement
Peterborough - PE4
Enquiry from: Lesley D
Start Date: Immediate
Thinking of replacing old boiler
Heating | Gas | Boiler Replacement
Rochester - ME1
Enquiry from: Moshahid A
Start Date: Immediate
Call back anytime. Extent of work: New Boiler Type of building: Terraced Fuel: Mains gas Number of radiators: 9 Quote requested on boiler replacement
Heating | Gas | Boiler Replacement
Stonehouse - GL10
Enquiry from: Danielle H
Start Date: Immediate
A quote and availability please for a combi boiler replacement please. Current model: Vaillant turbomax vuw 242, 24 kW, non-condensing, 78% efficient Combi. Horiz flue. There are 9 radiators, mostly...
Heating | Gas | Boiler Replacement
Aberdeen - AB10
Enquiry from: Maria S
Start Date: 1 to 3 months
customer in aberdeen area has requested that we arrange quotes for their gas boiler replacement project.mrs are considering various options and would like to discuss with a heating engineer directly.p...
Heating | Gas | Boiler Replacement
Enfield - EN3
Enquiry from: Joseph M
Start Date: Immediate
Call back anytime. Extent of work: New Boiler Type of building: Flat Fuel: Mains gas Number of radiators: 4 Quote requested on boiler replacement
Heating | Gas | Boiler Replacement
Southall - UB1
Enquiry from: Gurnam S
Start Date: Immediate
Owner Terraced bedroom 3 Combi boiler 5+ years old 1-3 months
Heating | Gas | Boiler Replacement
Wigan - WN6
Enquiry from: David C
Start Date: Immediate
Call back anytime. Extent of work: New Boiler Type of building: Terraced Fuel: Mains gas Number of radiators: 7 Quote requested on boiler replacement
Heating | Gas | Boiler Replacement
Taunton - TA2
Enquiry from: S N
Start Date: Immediate
Call anytime. Extent of work: New Boiler Type of building: Detached Fuel: Mains gas Number of radiators: 0 Quote requested on boiler replacement
Heating | Gas | Boiler Replacement
Wembley - HA0
Enquiry from: Sangeeta C
Start Date: Immediate
Call any time. Extent of work: New Boiler Type of building: Terraced Fuel: Mains gas Number of radiators: 0 Quote requested on boiler replacement
Heating | Gas | Boiler Replacement
London - W6
Enquiry from: Hussein A
Start Date: Immediate
call anytime. extent of work: new boiler type of building: flat fuel: mains gas number of radiators: 0 quote requested on boiler replacement
Heating | Gas | Boiler Replacement
Harrow - HA1
Enquiry from: Sayed A
Start Date: Immediate
Owner Bedrooms 4 Do you currently hava a gas boiler ==Yes how old youe current boler==10 years old supplied and fitted 1-3 Months
Heating | Gas | Boiler Replacement
Longniddry - EH32
Enquiry from: Gordon P
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.dr lives in the longniddry area and would like a call to discu...
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.