New Boiler Cost (2026 UK Guide)
A new boiler costs £1,800 to £5,000+ fitted for most UK homes in 2026, with a straightforward like-for-like combi replacement typically landing around £1,800 to £3,000. Your final boiler replacement cost depends on the type of boiler, the size of your home and where you live. The figures on this page are typical 2026 UK ranges to help you budget — the only way to know your exact price is to compare quotes from a few local Gas Safe plumbers and heating engineers.
We’re an independent directory, not a manufacturer or energy supplier, so we don’t push one brand. We compare all of them and route you to multiple installers.
New boiler cost at a glance (2026)
Here’s a quick price-at-a-glance summary of new boiler and boiler replacement costs in the UK, as of 2026. “Supply only” is the boiler unit on its own; “supply + fit” is the typical all-in installed price including labour and standard parts.
| Boiler type | Supply only | Supply + fit (typical) | Premium / complex install |
|---|---|---|---|
| Combi boiler | £600 – £1,500 | £1,800 – £3,000 | up to £4,500 |
| System boiler | £700 – £1,800 | £2,000 – £3,500 | up to £4,500 |
| Conventional (regular / heat-only) | £600 – £1,600 | £2,000 – £3,500 | up to £4,500 |
| Back-boiler removal & combi swap | — | £3,000 – £4,500+ | £5,000+ |
Typical 2026 UK ranges. Prices are guide figures, not guaranteed quotes — get a free quote for your home.
What’s usually included in a supply-and-fit price: the boiler itself, the flue, standard fittings and valves, labour, removal and safe disposal of the old unit, commissioning and a Gas Safe Building Regulations certificate. Extras such as a power flush, a magnetic system filter, new pipework, a smart thermostat or scaffolding are often quoted separately — see what affects the price below.
To turn these ranges into a firm figure, get free quotes from local Gas Safe heating engineers and compare what each one includes.
Cost by boiler type
The biggest single factor in your new boiler cost is the type of boiler you choose. Each suits a different size and style of home, and each carries a different price.
Combi boiler cost (supply + fit)
A combination (“combi”) boiler heats your radiators and provides hot water on demand from a single unit, with no separate cylinder or tank. It’s the most popular choice in UK homes, especially flats and smaller properties.
- Supply only: £600 – £1,500
- Supply + fit (typical): £1,800 – £3,000
- Premium / complex install: up to £4,500
A like-for-like combi swap in the same spot is at the lower end. Costs climb if you’re converting from another system, moving the boiler, or fitting a large, high-output premium model. As a citable headline: the average fitted combi boiler costs around £1,800 to £3,000 in 2026.
System boiler cost
A system boiler works with a hot water cylinder (but no loft tank) and suits larger homes, or any household where several people need hot water at the same time.
- Supply only: £700 – £1,800
- Supply + fit (typical): £2,000 – £3,500
System boilers cost a little more than combis to buy and fit, partly because of the cylinder and the extra connections involved.
Conventional / regular (heat-only) boiler cost
A conventional boiler — also called a regular or heat-only boiler — uses both a hot water cylinder and a cold water tank in the loft. It’s common in older and larger properties with traditional pipework.
- Supply only: £600 – £1,600
- Supply + fit (typical): £2,000 – £3,500
If you’re keeping the same heat-only setup, costs are predictable. Switching to a combi to free up loft and cupboard space adds to the price (see boiler replacement cost below).
Boiler-only (“supply only”) vs fitted price
You’ll see boilers advertised “supply only” from around £600. That’s the unit alone — it does not include the flue, fittings, labour or certification, and a gas boiler must be installed by a Gas Safe registered engineer by law. Buying the boiler yourself can occasionally save money, but many installers prefer to supply the unit so the manufacturer warranty (often 7–12 years) is valid and registered correctly. For most homeowners, a single supply-and-fit quote is simpler and safer. Compare fitted quotes here.
New boiler cost by property size
Boilers are sized by output in kilowatts (kW). A bigger home with more bathrooms and radiators needs a higher-output boiler, which costs more to buy and fit. As a rough guide for 2026:
| Property size | Typical combi output | Typical fitted cost |
|---|---|---|
| 1-bed flat / small home (up to ~10 radiators, 1 bathroom) | 24 – 27 kW | £1,800 – £2,500 |
| 2–3 bed house (up to ~15 radiators, 1 bathroom) | 28 – 34 kW | £2,000 – £3,000 |
| 4–5 bed house (15+ radiators, 2+ bathrooms) | 35 – 42 kW | £2,500 – £4,000+ |
Typical 2026 UK ranges — your engineer will confirm the correct output for your home.
A quick sizing rule of thumb for combi boilers: 24–27 kW suits small homes and flats; 28–34 kW suits most three-bed houses; 35–42 kW suits larger homes with two or more bathrooms. Larger homes with high simultaneous hot-water demand are often better served by a system boiler and cylinder rather than pushing a combi to its limit. A good engineer will calculate the right size for your property rather than simply matching your old boiler — under-sizing leaves you short of hot water, while over-sizing wastes money. Get a quote and ask for a sizing recommendation.
Boiler replacement cost — like-for-like vs full system change
“New boiler cost” and “boiler replacement cost” describe the same job from two angles. The biggest swing in price is whether you’re doing a simple like-for-like swap or a full system change.
A like-for-like replacement — same boiler type, same location — is the cheapest route, usually £1,500 to £3,000, because the existing pipework, flue position and connections largely stay put.
A full system change costs more because there’s more work involved. Common add-ons and conversions include:
- Back-boiler removal and combi swap — replacing an old back boiler (behind a gas fire) with a modern combi is one of the bigger jobs, typically £3,000 to £4,500+.
- Conventional-to-combi conversion — removing the cylinder and loft tank and re-routing pipework adds cost but frees up space.
- Moving the boiler location — relocating to a different wall or room means new pipework and a new flue route, adding several hundred pounds or more.
- New pipework or flue — required when changing boiler type, position or upgrading older systems.
- Magnetic system filter — a worthwhile add-on (often £100–£200 fitted) that protects the new boiler from sludge and is sometimes required to keep the warranty valid.
- Power flush — cleaning sludge from an older system before fitting, commonly £300 to £600, depending on the number of radiators.
Because these extras vary so much from home to home, a fixed quote that lists exactly what’s included is the only reliable figure. Compare quotes from Gas Safe engineers and check each one itemises the extras.
What affects the price of a new boiler
Two homes on the same street can get different quotes. Here’s what drives your boiler replacement cost up or down:
- Brand tier — budget brands sit at the lower end; premium brands cost more upfront but often come with longer warranties and higher efficiency. Because we’re independent, we’ll help you compare brands rather than steer you to one.
- Fuel type — mains gas is the most common and usually the cheapest to install. LPG boilers are similar in price but suit off-grid homes. Oil boilers (and oil-to-anything conversions) tend to cost more.
- Warranty length — longer manufacturer guarantees (often 7–12 years) can nudge the price up but protect you for longer; warranties usually require an annual service to stay valid.
- Controls and smart thermostats — adding a smart thermostat or zoned controls improves efficiency and comfort but adds to the bill.
- Scaffolding for the flue — if the flue exits high up or in an awkward spot, access equipment or scaffolding can add cost.
- Labour and day rates — heating-engineer labour is the single biggest regional variable, which is why prices differ across the UK (see below).
- Removal of the old unit — taking out and safely disposing of your old boiler (and any old cylinder or tank) is usually included, but worth confirming.
- Complexity and condition — old or non-standard pipework, sludge, or a tight installation space all add time and therefore cost.
New boiler cost by region (2026)
Where you live affects what you pay — almost entirely because of local labour rates, not the boiler itself. London and the South East are the clear premium outlier, with fitting typically 15–25% above the national average. Our own demand data backs this up: in London, heating and boiler work commands far higher advertiser costs than anywhere else in the country, reflecting higher labour rates and overheads in the capital. Northern cities, much of Scotland, Wales and parts of the Midlands tend to sit at or below the national average.
The table below shows how typical fitted prices for a standard combi boiler vary by city in 2026. Treat it as a directional guide to regional differences, not a fixed quote.
| City / region | Typical fitted combi (2026) | Vs national average |
|---|---|---|
| London | £2,300 – £3,800 | Highest (15–25% above) |
| Reading & South East | £2,100 – £3,400 | Above average |
| Birmingham | £1,900 – £3,000 | Around average |
| Manchester | £1,900 – £3,000 | Around average |
| Leeds | £1,850 – £2,900 | Around / below average |
| Sheffield | £1,800 – £2,800 | Below average |
| Bradford | £1,800 – £2,800 | Below average |
| Newcastle | £1,800 – £2,800 | Below average |
| Cardiff | £1,850 – £2,900 | Around / below average |
| Glasgow | £1,800 – £2,900 | Around / below average |
| Edinburgh | £1,900 – £3,000 | Around average |
Typical 2026 UK ranges, driven mainly by local labour rates. Prices are guide figures — get free local quotes for your exact area.
The practical takeaway: if you’re in London or the South East, comparing three or more quotes matters even more, because the spread between installers is wider. Wherever you are, comparing local Gas Safe heating engineers is the surest way to find a fair price.
Boiler grants & ways to save
There are a few legitimate ways to bring down the cost of a new boiler — or to fund a low-carbon alternative.
- Boiler Upgrade Scheme (BUS) — a government grant in England and Wales that helps with the cost of replacing a fossil-fuel boiler with a low-carbon heating system such as a heat pump (not a like-for-like gas boiler). Grant amounts and eligibility rules change over time, so check the current scheme details on GOV.UK before you budget around it.
- ECO4 — an energy-company obligation scheme that can fund heating improvements, including boiler replacements, for eligible low-income or vulnerable households. Eligibility is means-tested and criteria vary — confirm whether you qualify before relying on it.
- Off-season fitting — demand for boiler installs peaks in autumn and winter. Booking in spring or summer can mean better availability and, sometimes, keener pricing.
- Fixed-price installer packages — many engineers offer all-in fixed-price deals (boiler, flue, fittings, labour, warranty). These make budgeting easier and avoid surprise extras — just check exactly what’s included.
- Compare 3 or more quotes — the simplest saving of all. Prices for the same job vary widely between installers, so always compare at least three.
We never guess grant amounts. Eligibility and funding levels change, so always verify your eligibility through the official scheme before committing.
How to get free new-boiler quotes
The figures in this guide are typical 2026 ranges to help you plan. For a price you can rely on, you need quotes for your specific home from vetted, qualified engineers.
Here’s how to compare well:
- Get at least three quotes so you can spot a fair price and an outlier.
- Check each engineer is Gas Safe registered — it’s a legal requirement for any gas work, and you can verify the registration number.
- Make sure quotes are like-for-like — same boiler type and output, with the same extras (filter, flush, controls, removal) listed, so you’re comparing equals.
- Ask what’s included — flue, fittings, certification, old-unit removal and warranty registration should all be spelled out.
- Confirm the warranty — who registers it, and what you must do (usually an annual service) to keep it valid.
Through Trusted Tradesmen Quotes, you can request free, no-obligation quotes from local Gas Safe plumbers and heating engineers near you in minutes. Because we’re independent, we connect you with multiple installers and every brand — not a single manufacturer’s product.
If your boiler has already broken down and you can’t wait, see our guide to emergency boiler repair first, then plan the replacement once you’re warm again.
You can also find a trusted tradesman for any other job, or browse our other home improvement cost guides — including roof repair cost and kitchen renovation cost.
Get free quotes from Gas Safe heating engineers near you and compare your new boiler cost today.
Frequently asked questions
How much does a new boiler cost to install in 2026?
A new boiler typically costs £1,800 to £3,000 fitted for a standard combi in 2026, rising to £3,500 to £4,500+ for a system change or a complex install such as a back-boiler removal. Supply-only boilers start around £600, but a gas boiler must be fitted by a Gas Safe registered engineer. The best way to get an accurate figure is to compare a few local quotes.
How much does it cost to fix a boiler vs replace it?
A boiler repair averages around £150 to £400, while a full replacement starts from about £1,800 fitted. If you’re facing repeated repairs that add up toward the cost of a new unit, or your boiler is more than 10–12 years old, replacement is usually the better long-term value. Getting both a repair and a replacement quote helps you decide.
How much does a boiler service cost?
An annual boiler service typically costs £60 to £120 in 2026. As well as keeping your boiler running safely and efficiently, a regular service usually protects your manufacturer warranty — most warranties require proof of annual servicing to remain valid.
How much does a boiler pump replacement cost?
Replacing a central heating pump usually costs around £150 to £300, including parts and labour. The exact price depends on the pump model and how accessible it is. A Gas Safe engineer can confirm whether the pump is the fault before replacing it.
Is a new boiler cheaper to run?
A modern A-rated condensing boiler is more efficient than an old non-condensing unit, so it can reduce your gas use and running costs. If you’re considering switching to a low-carbon system such as a heat pump, Boiler Upgrade Scheme grants may help with the cost — check your eligibility on GOV.UK. To compare running costs and options for your home, get a quote from a local heating engineer.