New boiler cost UK 2026 — fitted prices including installation
A new mains-gas boiler with Boiler Central is offered from £1,790 supplied and fitted. Exact prices vary by model and home. In one example quote for a like-for-like combi boiler replacement (checked 6 November 2026), fitted prices started at £1,928.99. Get your fixed price online from your answers, then upload photos after you order and book a Gas Safe engineer.
See this month’s prices in our boiler prices guide.
If you are thinking about running costs as well as the fitting price, see what the plan to scrap gas standing charges could mean for your bill.
Example fitted boiler prices
Example prices from one quote for a like-for-like combi boiler replacement in a 3-bed semi, checked 6 November 2026. This is not our full range, and your home may show different boilers and prices — you see them before you pay.
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| Boiler | Type | Output | Example fitted price |
|---|---|---|---|
| Viessmann Vitodens 025 | Combi | 28kW | £1,928.99 |
| Alpha E-Tec NX | Combi | 28kW | £2,015 |
| Worcester Greenstar 2000 | Combi | 30kW | £2,250 |
| Viessmann Vitodens 050-W | Combi | 25kW | £2,400 |
| Worcester Greenstar 4000 | Combi | 25kW | £2,474.96 |
| Worcester Bosch Greenstar CDi Compact | Combi | 28kW | £2,540 |
| Viessmann Vitodens 100-W Beat the Bills package | Combi | 30kW | £2,900 |
| Viessmann Vitodens 100-W Beat the Bills package | Combi | 35kW | £3,000 |
The brands we fit are Worcester Bosch, Viessmann, Alpha and Ideal. Other names may appear in the quote tool for some homes — your quote shows exactly which boilers you can order.
What’s included in a fitted price
As standard, fixed installed prices typically cover:
- The new gas boiler, supplied and fitted by a Gas Safe engineer
- Removal of your old boiler
- Chemical flush, inhibitor and magnetic filter
- Wireless thermostat
- Commissioning and guarantee registration (your quote shows the guarantee for each boiler)
Major relocation, type conversion (system / regular / back boiler), or unusual flue work must appear on your quote before you pay. Confirm the full inclusion list on your quote.
You can also spread the cost with monthly payments. See our guide to new boiler finance.
How Boiler Central pricing works by job type
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| Job type | What to expect |
|---|---|
| Combi like-for-like | Usually the simplest path for many homes. Looking for combi boiler installation cost? See fitted combi prices. |
| System like-for-like | Often a different scope to entry combi swaps; cylinder work must be on the quote. Dates depend on the job — check your quote calendar. See system boilers. |
| Regular / conventional | Keeping traditional tanks; price depends on scope — use the quote. |
| Conversions | System→combi, back boiler→combi, many relocations: more labour; commonly around two days, so not next-day. |
Boiler replacement cost
Our gas boiler prices start from £1,790 supplied and fitted, depending on your home and the boiler you choose. A standard scope includes removal of your old boiler. You see your fixed price online based on your answers. One quote checked on 6 November 2026 showed example prices for a like-for-like combi boiler replacement in a 3-bed semi, starting at £1,928.99.
Boiler installation cost
“Installation cost” on aggregator sites often means labour-only. Boiler Central quotes are supply and fit for the stated scope — boiler plus the standard inclusions above — not a boiler-in-a-box price plus a separate labour guess.
Brands we fit (and brands people also search)
We supply and fit mains-gas boilers from:
Searching Ideal, Vaillant, Baxi or similar? We keep advice/review pages for brands people already have — useful when you’re replacing one — but start the quote to see which models are offered for your home.
How getting a fixed price works
- Answer questions about your home and current boiler in the online quote.
- Compare fitted prices for boilers that match.
- Choose your boiler and complete your online order — pick a date on screen.
- Upload photos of your boiler and pipework.
- Gas Safe install on your booked date(s).
Next-day installation
For eligible like-for-like swaps, order by 3pm and we can often fit the next day, subject to slot, stock and postcode. Conversions commonly take around two days. Other system or non-like-for-like dates depend on scope — use the quote calendar. See next-day boiler installation. For the installation process itself, see gas boiler replacement.
Introduction
Replacing a boiler is one of the most significant home improvement costs a UK homeowner faces, and understanding what drives the price helps you budget accurately, avoid overpaying, and identify the right boiler for your property. The price range is wide — a basic combi boiler in a small flat costs a fraction of a system boiler installation in a large family home — but the principles that determine cost remain consistent.
Boiler Central offers new mains-gas boilers from £1,790 supplied & fitted (exact prices vary by model and home). Across the UK market, the cost of a new boiler in 2026 is influenced by the type of boiler, the brand and output rating you choose, the complexity of the installation, and where in the UK you live. Additional factors, including power flushes, smart thermostats, magnetic filters, and pipework upgrades, can increase the total, and government grants can significantly reduce it for eligible households.
This guide breaks down every cost component clearly, covers all boiler types, lists realistic price ranges by brand, explains what installation involves and why costs vary, and outlines the government support available in 2026.
Understanding New Boiler Costs: The Core Relationships
New boiler pricing involves a network of interconnected factors — understanding how each one relates to the final cost enables more accurate budgeting and better purchasing decisions.
- A combi boiler is the most common replacement boiler type in the UK and produces the lowest installation cost when swapped like-for-like in a property with existing combi infrastructure.
- A system boiler installation requires a separate hot water cylinder, which adds to the total cost compared to a combi boiler replacement in the same property.
- A conventional boiler installation requires a hot water cylinder and a cold water storage tank, making it the most component-intensive and expensive boiler type to install in a new property.
- A back boiler conversion requires removing the old unit from behind the fireplace, installing new pipework, and positioning a replacement boiler in a new location — making it the most labour-intensive residential boiler installation available.
- Boiler output rating — measured in kilowatts — determines the unit cost of the boiler, with higher-output models required for larger properties commanding higher prices.
- Installation complexity increases cost when the boiler must be relocated, when pipework requires upgrading to current Gas Safe standards, or when the boiler type is being changed.
- Labour costs are higher in London and the South East than in other regions of the UK, reflecting the higher cost of Gas Safe engineer time in those areas.
- A power flush removes iron oxide sludge from the central heating circuit and is typically recommended during a boiler replacement to protect the new boiler’s heat exchanger from premature damage.
- A magnetic filter is installed on the central heating return pipe to continuously capture sludge particles, protecting the new boiler and extending its operational life.
- The Boiler Upgrade Scheme provides government grants of up to £7,500 to eligible households for replacing fossil-fuel heating systems with heat pumps or biomass boilers.
- The Energy Company Obligation (ECO4) provides funding for boiler replacements in low-income households that meet eligibility criteria related to benefits, income, and property energy efficiency.
How Much Does a New Boiler Cost in 2026?
The total cost of a new boiler includes the unit itself, installation labour, materials, and any additional work required. The following overview provides a starting point for budgeting based on boiler type and installation scenario.
Typical UK Market Costs by Installation Type
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| Installation Type | Average Total Cost |
|---|---|
| Combi boiler replacement (like-for-like) | £2,295 |
| System boiler replacement (like-for-like) | £2,295 – £5,000 |
| New boiler installation (no existing boiler) | £2,899 |
| System to combi conversion | £2,699 |
| Back boiler to combi conversion | £3,499 – £5,000 |
| Megaflo unvented system installation | £2,999 |
Prices correct as of January 2026.
These figures represent typical total costs including the boiler unit, installation labour, standard materials, and a new flue. Additional items such as a power flush, magnetic filter, smart thermostat, or extended warranty are not included in these base figures.
Thinking about a new gas boiler? Get a fixed, all-inclusive price online in under a minute. Supplied and fitted from £1,790.
Get my fixed priceBoiler Costs by Type
Comparing types, not just prices? See system boiler vs combi boiler.
Combi Boiler Cost
A combi boiler heats domestic hot water on demand from the mains and provides central heating from a single wall-hung unit — no cylinder or storage tanks required. It is the most popular boiler type in UK homes and produces the lowest total replacement cost when installed like-for-like.
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| Cost Component | Price Range |
|---|---|
| Boiler unit (supply only) | £700 – £1,800 |
| Installation labour | £800 – £1,500 |
| Total (supply and installation) | £1,800 – £4,000 |
Combi boilers are best suited to homes with one or two bathrooms and up to 3 bedrooms. In larger properties with multiple bathrooms and high simultaneous hot water demand, a system boiler is typically a better match.
System Boiler Cost
A system boiler heats water stored in a separate hot water cylinder, delivering consistent high-pressure hot water to multiple outlets simultaneously. It suits larger homes with 2 or more bathrooms and higher household occupancy.
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| Cost Component | Price Range |
|---|---|
| Boiler unit (supply only) | £800 – £2,000 |
| Installation labour | £1,000 – £2,000 |
| Hot water cylinder | £500 – £1,000 |
| Total (supply, cylinder, and installation) | £2,500 – £5,000 |
Conventional Boiler Cost
A conventional boiler — also called a regular or heat-only boiler — requires a hot water cylinder and a cold water storage tank. It is the most suitable option for large older properties with existing infrastructure, and is the most complex boiler type to install in a property without that infrastructure already in place.
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| Cost Component | Price Range |
|---|---|
| Boiler unit (supply only) | £700 – £2,500 |
| Installation labour | £1,000 – £2,500 |
| Hot water cylinder and cold water tank | £500 – £1,500 |
| Total (supply, tanks, and installation) | £2,200 – £5,500 |
Back Boiler Conversion Cost
Converting from a back boiler to a combi boiler is the most labour-intensive standard residential boiler installation. The process involves decommissioning or removing the old back boiler from behind the fireplace, installing new pipework to a new boiler location, and fitting the replacement unit with a new flue.
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| Cost Component | Price Range |
|---|---|
| Back boiler removal and decommissioning | £300 – £600 |
| New combi boiler supply | £700 – £1,800 |
| Pipework and installation labour | £1,500 – £2,500 |
| Total | £3,000 – £5,000 |
The average cost of a back boiler-to-combi conversion is approximately £4,000. The conversion typically takes 2 to 3 days and can reduce annual energy bills by over £800 due to the efficiency improvement from a 70%-rated back boiler to a 94% A-rated condensing replacement.
New Boiler Costs by Brand
The ranges below are general UK market supply-only guide prices for common brands, not Boiler Central fitted prices. Boiler Central fits Worcester Bosch, Viessmann, Alpha and Ideal — see the example fitted prices above.
The brand you choose affects both the upfront cost of the boiler unit and the long-term reliability, warranty length, and availability of parts. The following table outlines typical supply-only price ranges for the leading UK boiler brands.
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| Brand | Price Range (Supply Only) | Key Strengths |
|---|---|---|
| Worcester Bosch | £1,000 – £2,500 | Which? Best Buy, up to 12-year warranty, wide installer network |
| Viessmann | £900 – £2,200 | High efficiency, hydrogen-ready, premium build quality |
| Vaillant | £1,000 – £2,000 | Strong reliability record, long warranties, wide parts availability |
| Ideal | £700 – £1,800 | Competitive pricing, up to 12-year warranty on selected models |
| Baxi | £850 – £1,500 | Budget-friendly entry point, reliable mid-range performance |
| Alpha | £600 – £1,200 | Budget-friendly, suitable for smaller properties |
| Glow-worm | £600 – £1,200 | Cost-effective, straightforward installation |
| Potterton | £600 – £1,100 | Affordable, widely available parts |
Choosing a brand with a 10 to 12-year warranty and a wide installer network reduces long-term maintenance risk and ensures that accredited engineers are accessible for servicing or repairs.
Breakdown of Installation Costs
Installation cost is the component that varies most significantly between quotes and between regions. Understanding what installation includes helps you evaluate quotes accurately and identify any items that may be missing.
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| Installation Component | Price Range | Notes |
|---|---|---|
| Labour (standard combi swap) | £800 – £1,250 | Increases to £2,500 for system or conventional boilers |
| Materials (flue, fittings, valves) | £100 – £500 | Standard components for most installations |
| Power flush | £300 – £750 | Recommended when replacing a boiler in an older system |
| Magnetic filter | £100 – £200 | Protects the new boiler from sludge damage |
| Flue extension or plume kit | £75 – £300 | Required when the boiler is near windows or openings |
| Pipework upgrades | £200 – £500 | Required when existing pipes don’t meet current standards |
| Waste removal | £50 – £150 | Disposal of old boiler and associated components |
A like-for-like combi boiler swap in a standard property — same location, no pipework issues — represents the simplest and most affordable installation scenario. Costs increase materially when the boiler must be relocated, when pipework requires upgrading, or when the boiler type is being changed.
What Affects New Boiler Price?
Several factors beyond the boiler unit itself influence the final total cost of a new boiler installation.
Boiler Type
Combi boilers produce the lowest total installation cost in properties already configured for a combi. System and conventional boiler installations involve more components and higher labour time, increasing the total cost.
Boiler Output
Higher-output boilers designed for larger properties cost more than lower-output models. A 30kW combi boiler costs more than a 24kW model from the same manufacturer, and the correct output for your property should be confirmed by a Gas Safe engineer’s heat-loss calculation rather than an estimate.
Installation Complexity
Relocating the boiler — even within the same room — increases labour cost. Changing from one boiler type to another requires additional pipework. Installing in a property with no existing boiler infrastructure is more expensive than a like-for-like swap.
Location
Labour costs are higher in London and the South East than in other regions. An installation that costs £2,295 in the Midlands may cost £2,700 to £3,000 for the same specification in central London.
Additional Upgrades
A power flush, magnetic filter, smart thermostat, thermostatic radiator valves, and extended warranty are all optional additions that increase the upfront cost but deliver long-term benefits in efficiency, protection, or peace of mind.
Government Grants for New Boilers in 2026
Financial support is available to reduce the cost of boiler replacement and heating system upgrades for eligible households in 2026.
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| Grant Scheme | Funding Amount | Eligibility |
|---|---|---|
| Boiler Upgrade Scheme (BUS) | Up to £7,500 | Replacing fossil fuel systems with heat pumps or biomass boilers; available until 2028 |
| Energy Company Obligation (ECO4) | Varies | Low-income households, benefit recipients; runs until March 2026 |
| Home Energy Scotland Grant | Varies | Scottish homeowners installing clean heating systems |
The Boiler Upgrade Scheme provides grants specifically for replacing gas or oil heating systems with low-carbon alternatives — it does not cover gas boiler replacements directly.
ECO4 can cover gas boiler replacements in qualifying low-income households. To check eligibility and apply, contact your energy supplier, local council, or an MCS-certified installer who can advise on the most appropriate scheme for your circumstances.
Tips for Reducing New Boiler Cost
The following measures help control the total cost of a new boiler installation without compromising on quality or safety.
- Get multiple quotes — obtaining three or more quotes from Gas Safe-registered installers ensures you are paying a competitive price and allows you to compare what is included in each quote.
- Book in summer — engineers are less in demand between May and September, and some offer seasonal discounts of up to 25% compared to peak winter pricing.
- Choose the right boiler type for your property — installing a higher-capacity boiler than your property requires wastes money on unit cost and ongoing running costs.
- Consider long warranty models — a boiler with a 10 to 12 year warranty costs more upfront but eliminates repair costs for the majority of its operational life.
- Check grant eligibility before buying — confirming whether ECO4 or another scheme applies to your circumstances before committing to a purchase could save thousands of pounds.
- Replace before it fails completely — a planned replacement allows time to compare quotes and choose the right boiler; an emergency replacement during a breakdown limits choice and increases cost.
New boiler cost FAQs
How much does a new boiler cost fitted in the UK?
With Boiler Central, a new mains-gas boiler is offered from £1,790 supplied and fitted. Exact prices vary by home and model. In one example quote for a like-for-like combi boiler replacement in a 3-bed semi (checked 6 November 2026), fitted prices started at £1,928.99. You see the fixed price for your home in the online quote before you pay.
What is included in a fixed-price boiler installation?
Boiler Central fixed fitted prices typically include the new gas boiler, removal of your old boiler, fitting by a Gas Safe registered engineer, a chemical flush with inhibitor, a magnetic filter, a wireless thermostat, and manufacturer guarantee registration. Your quote shows the guarantee for each boiler. Major extras such as moving the boiler or converting from a system, regular or back boiler appear in your quote before you pay. Confirm the full inclusion list on your quote.
Can I get a fixed boiler price online and next-day fitting?
Yes. Complete the online quote using your answers about the home and boiler, then upload photos of your boiler and pipework after you order. Order by 3pm and, where your job, stock and postcode allow, like-for-like swaps can often be fitted the next day. Conversions commonly take around two days. Other system or non-like-for-like dates depend on job scope — use the first real date in your quote calendar.
Which brands does Boiler Central fit?
Worcester Bosch, Viessmann, Alpha and Ideal mains-gas boilers. Your quote shows the models available for your answers.
What makes a boiler quote more expensive?
Conversions, relocating the boiler, higher outputs, system/cylinder work, and flue extras. The quote lists them before you pay.
Are market “£1,800–£5,000” bands useful?
They’re planning ranges across many installers and job types. Use them for context, then get a fixed Boiler Central price for your home.
How long should a boiler last before replacement?
A gas boiler should be replaced approximately every 15 years. After this point, the boiler is likely operating below its original efficiency rating due to component wear, and the cost of maintaining an ageing unit typically exceeds the benefit of continued repair. A boiler over 15 years old operating at 70% to 80% efficiency wastes significantly more gas per unit of heat delivered than a current A-rated model at 94% efficiency — producing ongoing savings that help recover the installation cost of a replacement.
What is the cheapest type of boiler to install?
A like-for-like combi boiler replacement is the cheapest boiler installation in most standard properties. Our gas boiler prices start from £1,790, depending on your home and the boiler you choose. This assumes the property already has a combi boiler at the same location, with no pipework changes or boiler relocation required. System and conventional boiler installations cost more due to the additional components required. Budget boiler brands, including Alpha, Glow-worm, and Potterton, offer lower unit costs than premium brands while still meeting current efficiency and safety standards.
Are there government grants available for boiler replacement in 2026?
Yes — the Boiler Upgrade Scheme (BUS) provides grants of up to £7,500 to eligible households for replacing fossil-fuel heating systems with heat pumps or biomass boilers, and is available until 2028. The Energy Company Obligation (ECO4) provides funding for boiler replacements in low-income households receiving qualifying benefits and runs until March 2026. Contact your energy supplier, local council, or an MCS-certified installer to check eligibility and begin an application. The boiler upgrade scheme in the UK not only aims to improve energy efficiency but also plays a crucial role in reducing carbon emissions across the country. By making these technologies more accessible, the scheme supports the government’s wider objectives for climate change and sustainable energy transition. Homeowners are encouraged to take advantage of these grants to enhance their properties and contribute to a greener future.
How much does a Worcester Bosch boiler cost?
A Worcester Bosch boiler costs between £1,000 and £2,500 for the unit alone, depending on the model and output rating. Worcester Bosch holds the Which? Best Buy Award for boilers and offers warranties of up to 12 years on selected models when installed by an accredited engineer. The most popular current models include the Greenstar 8000 Life and the Greenstar 8000 Style, which are available in combi and system boiler configurations and are priced in the mid-to-upper range of the brand’s lineup. When making a decision, it’s important to consider a Worcester Bosch boiler pricing comparison to ensure you’re getting the best value for your investment. Take into account installation costs as well, as they can significantly affect the overall price. Many homeowners find that the long warranties and energy efficiency of Worcester Bosch models justify the initial price, leading to significant savings in the long run.
How much does it cost to convert from a back boiler to a combi?
Converting from a back boiler to a combi boiler costs between £3,000 and £5,000, with an average of approximately £4,000. The conversion involves decommissioning the back boiler behind the fireplace, installing a new combi boiler in a new location with new pipework and a dedicated flue, and removing the old hot water cylinder. The process typically takes 2 to 3 days. Despite the upfront cost, the efficiency improvement from a back boiler to a current A-rated combi can save over £800 per year in energy costs.
Is replacing a boiler a big job?
A standard like-for-like combi boiler swap in the same location is a straightforward job that most Gas Safe engineers complete within a day.
Replacing a boiler in a new location, changing from one boiler type to another, or installing in a property with no existing boiler infrastructure is a more significant project that may require 2 to 3 days and involve floorboard removal, new pipework runs, and structural modifications for flue routing. The complexity and duration depend on the specific installation scenario rather than the boiler itself.
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Also useful: new boilers · buy a boiler online · cheap boiler installation · British Gas boiler quote alternatives · Boiler Central vs BOXT, Heatable & iHeat
Conclusion: Budget Realistically and Choose Wisely
A new boiler is an investment in your home’s comfort, efficiency, and reliability — not simply an unavoidable cost. Understanding the full breakdown of what drives the price allows you to budget accurately, compare quotes on a like-for-like basis, and identify the best boiler for your specific property and household needs.
A modern A-rated condensing boiler reduces energy consumption compared to any boiler more than 10 years old, delivering ongoing bill savings that help recover the installation cost over time. The longer you delay replacing an ageing, inefficient boiler, the more that gap in efficiency costs you every month.
Get multiple quotes from Gas Safe-registered engineers, check eligibility for government grants before committing to a purchase. The right boiler, correctly installed and regularly serviced, will heat your home reliably and efficiently for 15 years or more.
Related reading: find out how long it takes to fit a new boiler, what affects copper piping costs if pipework needs changing, and how the proposed boiler tax could affect the cost of home heating.
Ready for a new boiler? Next-day installation if you order by 3pm, guarantees of up to 14 years depending on model and 0% finance available.
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