New boiler costs range from £500 to £3,000,
or from £2,000 to £4,500 including labour
Pricing guides

How much does a new boiler cost?

Wondering how much a new boiler installation will cost you? This guide explores the many factors, complexities and product types that affect a boiler's total price and relative value for money, alongside answering frequently asked questions about boiler and engineer costs. All estimates and figures concerning new boiler costs in the UK are accurate as 2024.

For those in need of a boiler replacement, cost is a crucial factor. When you know how much you can expect to pay for materials, labour, disposal, etc., you can budget appropriately for the expense before connecting with a Gas Safe heating engineer on MyBuilder. By doing this, you’ll avoid miscommunications and sidestep delays that would have kept your home chilly for longer!


Average boiler costs

A boiler is an essential element of the modern home year-round, but especially so in the chilly winter months when our radiators provide welcome relief. As such, when a boiler breaks or seems to be about to give out, the situation can feel overwhelming, challenging and stressful. Doubly so if you’ve never replaced a boiler before and don’t know what to expect. Triply so if you’ve been unexpectedly faced with the need for a new system in less-than-ideal circumstances. 

Whatever your situation, research is your friend, and you can use the average boiler replacement cost in the UK as a valuable starting point for budgeting purposes: £2,000 to £4,500 in total. This cost includes the labour of a licensed heating engineer, whom you’ll legally need to hire for any gas-based installation (and whom we’d strongly recommend you hire even for electric and oil boilers).

Based on current prices and labour rates, this table breaks down average costs for the various tasks that a central heating engineer might complete during the course of a boiler replacement or installation job. 


Heating engineer’s taskAverage price range 
A straight-swap boiler replacement (e.g., gas combi to gas combi)£3,300 to £3,385 
Changing the position of your current boiler£336 to £672 (though extra costs may apply)
Installing a boiler in a new home/a home without an existing system£3,469 to £3,805
A boiler replacement and type change (e.g., heat-only to combi)£3,805 to £4,141
A boiler replacement, type and position change£4,141 to £4,645
A boiler fuel change (e.g., gas to oil)£672 to £1,008 (extra costs may apply)
Adding a Wi-Fi-enabled heating controller to the systemApproximately £220


As noted, these figures are all averages based on existing data. Though they can help you budget, they won’t necessarily reflect the actual total cost of a boiler replacement in your specific circumstances. For a more accurate breakdown of what you’ll need to pay to get your home feeling toasty and cosy again, speak with available engineers in your local area and request detailed quotes. 

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How much does a new boiler cost?

So, how much does a new boiler actually cost? Which price-influencing factors take it from £2,000 to £4,000? And when might it be more like £10,000? All in all, your total price for a new boiler, inclusive of labour and materials, will be impacted by:

  • The specifics of your location: Will any accessibility issues make it more costly for a Gas Safe heating engineer to visit you or transport your new boiler to the property? Also, are your hiring options limited by your location? On the other hand, does your location push up the cost of living, including the cost of an engineer, as it might in somewhere like London?
  • The type of boiler system you’d like to install: The three most common boiler types in the UK are combi, system and heat-only. A combi is the most widely used, but many options are available, and prices range considerably based on both boiler type and boiler fuel type. For instance, heat-only boilers are available from about £500, while even a basic biomass boiler would likely cost you at least £7,000.
  • Your existing boiler situation: Will you be replacing one boiler with another of the same type, or will things become more complex? Have you accounted for old system disposal costs? Or, alternatively, have you accounted for the additional time and labour required to install a central heating system from scratch rather than replacing an existing one?
  • The size of your home: The larger your property is, the more powerful (larger in kW size and usually physical size) your boiler will need to be to service it. Thus, the more expensive that boiler will be. For example, a 12 kW electric combi boiler with a built-in cylinder usually costs £1,500 to £2,500, while an 18 kW floor-standing gas boiler with a cylinder and a long warranty would be closer to £4,500

The cost of a new boiler for a one-bed flat in a city isn’t going to be on par with the cost of a new boiler for a six-bed detached farmhouse in the middle of the countryside. Especially if we’re comparing, say, a new combi boiler cost for the flat with a new gas boiler cost for the farmhouse. It’s all relative. Check out the table below, in descending price order, to see how things change from size to size amongst products from two of the UK’s biggest boiler companies (Vaillant and Worcester Bosch). 

Boiler modelBoiler brandBoiler cost
Greenstar 8000 Style 30 Combi boilerWorcester Bosch£1,850
ecoTEC Green iQ 843 Combi boilerVaillant£1,460
ecoTEC Plus 637 System boilerVaillant£1,270
Greenstar 8000 Style 35 System boilerWorcester Bosch£1,250
Greenstar 27i System boilerWorcester Bosch£940
ecoTEC Pro 24 Combi boilerVaillant£850
Greenstar 28CDi Compact Combi boilerWorcester Bosch£800
Greenstar 4000 12 kW System BoilerWorcester Bosch£800
ecoTEC Plus 612 System boilerVaillant£780
Greenstar 2000 25 kW Combi boilerWorcester Bosch£600
ecoFIT Pure 825 Combi boilerVaillant£760
ecoFIT Pure 612 System boiler Vaillant£730

Cost of power flushing

Before installing a new boiler, you may need to add power flushing your central heating system to your quote for an additional £250 to £800

A power flush can have a huge impact, especially on an older system, restoring energy efficiency to the property and allowing you to fight against any corrosion. Plus, power flushing before your new boiler goes in can prevent potentially costly contamination and damage. Signs that you might need a pre-replacement power flush include any of the following:

  • Your radiators need to be bled with increasing regularity
  • Your radiators have developed cold spots that never seem to heat up
  • Even when your pipes are hot, some or all of your radiators remain cold
  • Your central heating takes a long time to get to the correct output level
  • Your radiators produce discoloured water when bled
  • Your central heating system (radiators and/or boiler) has begun to operate more noisily
  • Your radiators have become more prone to leaks

During the power flush process, your heating engineer will send a high-pressure stream of water around your system using a pumping station. As it rushes through, it will clear away blockages of sludge, rust and debris that could otherwise have contaminated or decreased the effectiveness of your new boiler. 

Then, your engineer will wash a chemical neutraliser through the system and confirm it isn’t too acidic. Finally, they’ll add some inhibitor fluid to prevent corrosion-friendly cold spots from occurring in future. This addition won’t be too costly, with a one-litre bottle of inhibitor usually costing around £15.

Cost of your chosen boiler 

Depending on the size of your home and the budget you have to allocate, the most significant cost portion of a straightforward boiler replacement job could be your chosen product, the boiler itself. Let’s break down the average prices for various boiler types available in the UK.

Type of boilerAverage cost (plus VAT)
Combi boiler£1,500
System boiler£1,300
Heat-only (also known as conventional) boiler£2,000
Liquefied petroleum gas (LPG) boiler£1,500
Biomass boiler£10,000
Condensing boiler£2,500

If you’re torn between the three most commonly selected options of a combi boiler, a system boiler or a heat-only conventional boiler, the table below should help you to identify the benefits and drawbacks of each.



Combi Boilers:

High levels of energy efficiency attainableNot usually suitable for larger homes
Can reduce the cost of energy billsCan be incompatible with old pipework
Compactly sizedNot sensible in homes with weak water pressure
Relatively easy to install 
Allows for on-demand hot water availability 

System Boilers:

Smaller sized than heat-only boilersMore bulky in size than a combi boiler
Can supply warm water to multiple taps at onceHot water amount limited by tank size
Provides consistently strong water pressureHot water must be heated before use
Compatible with solar energy  

Heat-Only Boilers:

Can supply warm water to multiple taps and showers at onceHot water amount limited by system size
Easy to maintainLess efficient than combi and system boilers
Provides consistent water pressureDoesn’t always offer the strongest water pressure
Immersion heater can be added to ensure supply continues if the boiler breaks downThe hot and cold tanks take up a lot of space

At this stage, you may also need to account for the different boiler fuel types and how these impact price. Modern electric and gas boilers tend to be available at very similar price points, varying from £500 to £3,000, while oil boilers range in price from £1,000 to £4,500.

Cost of installing a new boiler 

Once you know how much your boiler will cost you to purchase, you should look into the price of labour and installation for a truly accurate idea of what to expect. The average hourly rate for a UK heating engineer on the Gas Safe Register is £42, with prices across the UK ranging from £27 per hour up to £72 per hour

The cost of labour versus materials might be comparable for simple boiler installation jobs, but things can quickly become more costly on the labour side. It all depends on what you need your engineer to do and how long it will take them.

If, for example, you’re switching from a conventional gas boiler over to a new combi gas boiler, you’ll need to pay for your engineer to install the new boiler and remove your existing water tank/tanks. This could push the total up by anything from £100 to £350. Or, if you’re adding a tank to your system, you’ll pay around £600 to £700 to do so.

Cost to replace pipework 

Your engineer may inspect your system before an installation and realise that your pipework is leaking or corroded, having suffered pinhole leaks that went undetected for some time. This will likely require a total replacement job, encompassing several days of intensive and disruptive work, and an addition to the project cost of approximately £800 to £1,000.  

Tempting as it might be to hide from this expense if it crops up, fixing corrosion issues as soon as they’re spotted is crucial. Left to worsen, they’ll only become more and more costly with time. 

Cost of replacing radiators

The choice to invest in a new boiler might lead your heating engineer to discover that there are issues with your current radiators. In some cases, a radiator or multiple radiators will need to be replaced, having moved past the point of repair. This is particularly likely if a radiator has been power flushed, but you’re still running into issues like the following:

  • Your radiators are leaking water
  • Your radiators won’t heat up
  • Your radiators are rusting
  • Your radiators are making noises, rattling and clanging
  • Your radiators have to be bled more and more regularly
  • Your energy bills are rising, but your unit cost and energy use patterns aren’t changing

Moreover, you may need to replace all of your radiators if you’re installing a new, modern boiler that isn’t compatible with your older radiator system. The table below outlines numerous radiator removal costs, which you can multiply by the number of radiators you’ll need to replace to shape your budget.

Radiator jobAverage cost
Removing a small radiator£80
Removing a large radiator£120
Removing and replacing a small radiator£150
Removing and replacing a large radiator£250
Installing a new small radiator£250
Installing a new large radiator£350

This table then looks at average price ranges for each radiator type.

Radiator typeAverage price range (materials only)
Traditional central heating radiators£20 to £120
Column radiators£115 to £380
Designer radiators£180 to £500+
Vertical radiators£100 to £575
Cast iron radiators£120 to £750
Flat panel radiators£180 to £250
Stainless steel radiators £175 to £275

Cost to add thermostatic controls

If you’d like to add thermostatic controls to your central heating system alongside your new boiler, you can expect to pay your heating engineer an additional £120 to £250 per item, primarily in supply costs. Your exact cost will be determined by which of the following you choose to add to your system:

  • Digital programmers
  • Programmable thermostats for individual rooms
  • Intelligent, Wi-Fi-enabled controls
  • Compensation controls for load and weather
  • Smart radiator valves
  • Thermostatic zone controls

Smart heating controls are becoming increasingly popular for those who want to keep their home at a comfortable, warm temperature without wasting energy or overheating. They put energy efficiency in the hands of the consumer, which is something that you might find hugely appealing for the relatively accessible price point. Speak with your engineer about thermostatic control possibilities if you’d like to learn more about how these items could work in your home.

Cost to run your boiler

This is a cost that most people forget to consider when they’re pricing up and purchasing, but it can have a considerable long-term impact. Looking solely at boiler fuel types, we can see that mains gas runs at an average of £0.1151 per kW hour, oil at about £0.1166 per kW hour, and electric at £0.3894 per kW hour.

This creates an obvious conclusion until you factor in that electric boilers are among the most efficient on the market. In other words, an electric boiler is more expensive to run, but you’ll almost certainly use less electricity per kW hour than gas or oil, offsetting the difference. 

Do plenty of running cost and efficiency research into the boiler models you’re considering in order to find the best option here. Never rely on boiler or fuel type to paint you a complete picture. 


How long does installing a new boiler take?

The length of time that it takes to install a new boiler depends significantly on what your existing system is and what your new system will be. Swapping two boilers of the same type, for example, will take much less time than replacing a boiler with one of a different type and changing the position it occupies in your home. This table of average timeframes should help you determine where your job will fit in and what you can expect.


Heating engineer’s taskUsual timeframe
A straight swap boiler replacement (e.g., combi to combi)Four to six hours
Changing the position of your current boilerOne to two days
Installing a boiler in a new home/home without an existing systemOne to two days
A boiler replacement and type change (e.g., gas to combi)Two to three days
A boiler replacement, type and position changeThree to four days
A boiler fuel type changeTwo to three days 
Adding a Wi-Fi-enabled heating controller to the systemAround 30 minutes


If anything goes awry during the installation process, these timeframes will, of course, extend. And, even if everything goes to plan, they aren’t a hard-and-fast guarantee. They’re simply an average based on the experiences of professional heating engineers and their customers. 


How to reduce boiler replacement costs

Purchasing a new boiler for your home comes at no small cost, especially when it crops up unexpectedly because something’s gone wrong. If you’re looking for ways to minimise the undeniably large expense of replacing your boiler, check out these cost-reducing tips.

  • Do your research, then do it again: Research is a must when you want to avoid spending more than necessary, and that’s certainly true in the world of boilers. Many options are floating around on the market for you to purchase, all of different types, fuel types and sizes. So, the more you learn about what you need for your particular property and preferences, the less likely you are to pay through the nose for something you don’t really require.  
  • Look into government schemes and potential grant eligibility: Always take the time to look into government scheme eligibility before taking a financial leap with a new boiler. If, for example, you’re planning to install a biomass boiler on your property, you might be eligible for the UK government’s Boiler Upgrade Scheme, which seeks to encourage those who can to transition away from fossil fuel heating systems and towards sustainable alternatives.
  • Compare and contrast multiple quotes to get the best deal: Use MyBuilder’s matchmaking system to connect with reliable local heating engineers who can fit your new boiler. Then, collect detailed quotes from each suitable engineer and compare these on a like-for-like basis, alongside other data like customer reviews, tradesperson experience and qualifications, to get yourself the best deal on the right engineer. 
  • Consider your investment in the short and long term: It’s easy to think solely about the up-front cost of a boiler, but within reason, try to balance the desire to save now with the awareness that you need to make an investment that pays off in the long term. For instance, investing in a sturdy mid-range boiler that runs efficiently could serve you better, even five years from now, than investing in a low-efficiency budget machine that’s always breaking.
  • Request recommendations from your engineer that align with your budget: If you’ve done your research and established your budget but still can’t narrow down your best option, why not turn to a professional for advice? Many central heating engineers would happily offer their recommendations to a customer, either adhering to the budget you share with them or graciously pointing out if they feel your budget might have been set incorrectly. 
  • Get to know your new boiler: Lower future expenditure and prolong the life of your new boiler by getting to know it well and staying consistently on top of its maintenance requirements during its entire lifespan. Once a year, for instance, you should always have your boiler serviced to ensure it’s functioning correctly and free of potentially damaging or dangerous water/gas leaks.


Can I install my own boiler?

We definitely wouldn’t recommend a DIY attempt at installing a new boiler. Gas boilers must legally be put in place by a heating engineer on the Gas Safe Register, and oil and electric boilers can be incredibly dangerous to work with too. Overall, it’s best to leave your new boiler with the professionals, who will handle everything from removal to power flushing to installation to manufacturer warranty registration. 

What’s the cheapest boiler option?

The most affordable boiler option for one home might differ from the most affordable boiler option for another based on limitations of capacity connected to property size and the number of radiators to be serviced. Usually, though, the cheapest option based on a combination of boiler price, installation cost and running cost is a combi boiler. There’s a reason combi boilers are the most popular choice in the UK.  

Which boiler type is the most energy efficient?

A combi boiler is the most energy efficient option on the market in the UK, using condensing technology to recycle heat that would otherwise be wasted. In terms of specific combi boiler models, two of the best on the market right now in terms of efficiency are the Viessmann Vitodens 100-W Combi (98% efficiency rating, £1,440 estimated supply cost) and the Worcester Bosch Greenstar 8000 Style Combi (94% efficiency rating, £1,790 estimated supply cost).

What size boiler do I need?

You can usually begin to figure this out by counting the radiators in your home. The more you have, the more power your boiler will need to provide each one with heated water. Let’s break down the required power outputs for a range of different radiator amounts: 

  • Up to 10 radiators: 12 to 15 kW for a heat-only or system boiler, 24 to 27 kW for a combi 
  • 10 to 15 radiators: 18 to 24 kW for a heat-only or system boiler, 28 to 34 kW for a combi
  • 15 to 20 radiators: 30 to 40 kW for a heat-only or system boiler, 32 to 40 kW for a combi

Do I need to replace my boiler?

If you’re on the fence about whether you need to replace your current boiler, it’s usually better to be safe than sorry. Keeping a boiler going until it’s truly on its last legs could be more costly, all told, than biting the bullet and paying for a replacement here and now. To narrow things down and clarify your situation, ask yourself questions like the following:

  • Are repairs on this boiler costing more, at this point, than a new boiler would?
  • Is my boiler still sufficient to meet the needs of my home?
  • Does my boiler have a very low level of energy efficiency?
  • Is my boiler old and coming to the end of its life?
  • Is my boiler in the wrong location in my home, and might it benefit from being relocated?

Your new boiler installation checklist

Equipped with plenty of information about the cost of your new boiler, you can now head to MyBuilder to source a talented trade professional who can help you with supply and installation. If this process seems daunting or confusing, follow our checklist to ensure you connect with the right central heating engineer for your needs. 

  • Do some initial research and post your job: Have an idea of the price, budget and likely required capacity for your new boiler, then post on MyBuilder about the specifics of your job. For instance, is it a simple gas combi to gas combi swap, a fuel type swap, or even a changeover from heat-only to combi? We’ll share your post with tradespeople in your area, and appropriately skilled Gas Safe engineers with the right availability will register their interest. 
  • Peruse MyBuilder profiles for relevant experience and quality customer service: When you have a pool of potential hires and are in the quote comparison phase, don’t forget to look at each engineer's customer reviews and professional history. Pay particular attention to the quality of their customer service, as reported by past customers, and the relevance of their working experience in terms of the sort of boiler work they’ll be doing for you.
  • Double-check everything: Ensure that the quotes you’ve received are all-inclusive and free of hidden costs. Get answers to any lingering questions you might have about the preparation, installation or aftercare you’re being offered. Ask for evidence that your engineer is on the Gas Safe Register and adequately insured. Steer clear of any tradesperson who seems unwilling to answer your questions or provide you with the evidence you need.
  • Make your final hire with confidence, and get your new boiler up and running: Knowing everything you need to know to make the right choice for your home, formalise things with your engineer and get your new boiler in place. In no time, the stress and expense of the entire boiler replacement experience will be forgotten, and you’ll be able to enjoy all the benefits of a warm and toasty, well-heated property.

Hopefully, you now have all the information you need to price up and purchase your new boiler. To find a qualified local heating engineer quickly and easily, try our matchmaking system today.

Get a free quote

We can help you meet professional gas engineer near you to get real quotes today.

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