If your boiler is on the blink, you're probably wondering one thing: how much does a new boiler cost in 2026? It's the biggest heating expense most UK homeowners will face, and getting the right answer matters — overpay and you waste hundreds; underspend and you could end up with an undersized unit that can't keep your home warm.
The short answer: a new boiler costs between £1,800 and £4,500 installed in the UK in 2026, depending on the boiler type, brand, home size, and where you live. But the full picture is more nuanced than a single number, so this guide breaks down every factor that affects the price — from combi vs system vs conventional, to brand comparisons, regional variations, and the government grants that could knock thousands off the bill.
Average New Boiler Cost UK 2026 — By Type
There are three main types of gas boiler fitted in UK homes: combi boilers, system boilers, and conventional (regular/heat-only) boilers. Each has a different price range based on complexity, components, and suitability for your property.
| Boiler Type | Supply Cost | Installation Cost | Total Installed | Best For |
|---|---|---|---|---|
| Combi boiler | £800–£2,000 | £600–£1,500 | £1,800–£3,500 | 1–3 bed homes, 1 bathroom |
| System boiler | £900–£2,200 | £800–£1,800 | £2,200–£4,000 | 3–5 bed homes, 2+ bathrooms |
| Conventional boiler | £800–£1,800 | £700–£1,600 | £2,000–£3,500 | Older homes with existing tanks |
| Combi-to-combi swap | £800–£2,000 | £500–£900 | £1,800–£2,800 | Simplest, cheapest installation |
| Conventional-to-combi conversion | £800–£2,000 | £1,200–£2,500 | £2,500–£4,500 | Freeing up loft/airing cupboard space |
The most common installation in the UK is a combi-to-combi swap, where you replace an existing combi with a new combi in the same location. This is the quickest and cheapest job — often completed in a single day — because the pipework, flue, and gas supply are already in place.
Converting from a conventional boiler to a combi is significantly more expensive because the installer needs to remove the cold water tank (usually in the loft) and the hot water cylinder (usually in an airing cupboard), reroute pipework, and potentially upgrade the gas supply. However, you do reclaim valuable storage space.
Combi Boilers — The UK's Most Popular Choice
Around 70% of all new boiler installations in the UK are combi boilers. They heat water on demand — no hot water cylinder or cold water tank needed — making them compact, efficient, and ideal for smaller homes. A mid-range 28–30kW combi boiler from a reputable brand costs £2,000–£2,800 installed in 2026.
The main limitation of combi boilers is that they can only supply one hot water outlet at a time. If you run a shower while someone fills the kitchen sink, the flow rate drops noticeably. For homes with two or more bathrooms used simultaneously, a system boiler is a better option.
System Boilers — For Larger Homes
System boilers heat water and store it in a cylinder, meaning you can run multiple taps and showers at the same time without losing pressure. They're the preferred choice for 3–5 bedroom homes with two or more bathrooms. The downside is the added cost and the need for a hot water cylinder, which takes up space in an airing cupboard or utility room.
Conventional Boilers — For Existing Systems
Also called regular or heat-only boilers, conventional boilers work with both a hot water cylinder and a cold water tank in the loft. They're becoming less common in new installations but are still relevant if you have an existing gravity-fed system and don't want to upgrade the pipework. They're also the only type compatible with older, open-vent heating systems.
New Boiler Cost by Brand — UK 2026
The brand you choose has a significant impact on cost. Here's how the UK's most popular boiler brands compare in 2026, based on typical mid-range combi boiler prices (28–30kW) fully installed:
| Brand | Typical Installed Cost | Warranty | Reputation |
|---|---|---|---|
| Worcester Bosch | £2,400–£3,500 | Up to 12 years | Premium, consistently top-rated by Which? |
| Vaillant | £2,300–£3,300 | Up to 10 years | German engineering, excellent reliability |
| Ideal | £1,900–£2,800 | Up to 12 years | British brand, great value for money |
| Baxi | £1,800–£2,600 | Up to 10 years | Budget-friendly, reliable workhorse |
| Viessmann | £2,200–£3,200 | Up to 10 years | German brand, premium build quality |
| Alpha | £1,700–£2,300 | Up to 7 years | Budget option, solid entry-level |
| Glow-worm | £1,800–£2,400 | Up to 7 years | Vaillant subsidiary, good mid-range |
Worcester Bosch and Vaillant consistently dominate the premium end of the market. Worcester Bosch has been a Which? Best Buy for over a decade, and its Greenstar 8000 Life and CDi Classic ranges are the most popular premium boilers fitted by Gas Safe installers. You'll pay more, but you get industry-leading reliability and long warranties.
If budget is your primary concern, Baxi and Ideal offer excellent value. The Baxi 200 and Ideal Logic+ are two of the most fitted budget boilers in the UK, and both come with generous warranty periods when installed by an accredited installer. You can easily save £500–£800 compared to a Worcester Bosch or Vaillant without sacrificing much in terms of reliability.
Factors That Affect New Boiler Cost
The final price you pay isn't just about the boiler itself. Several factors can push the cost up — or bring it down:
1. Boiler Size (Output in kW)
A 24kW combi boiler is cheaper than a 38kW model. Choosing the right size for your home avoids overpaying for capacity you don't need. As a rough guide:
- 1–2 bedrooms, 1 bathroom: 24–27kW combi (£1,800–£2,400)
- 3 bedrooms, 1 bathroom: 28–30kW combi (£2,000–£2,800)
- 4 bedrooms, 2 bathrooms: 32–35kW combi or system boiler (£2,400–£3,500)
- 5+ bedrooms, 2+ bathrooms: 35–38kW system boiler (£2,800–£4,000)
2. Installation Complexity
A like-for-like swap in the same location is the cheapest and simplest job. Costs increase if you need to:
- Relocate the boiler (e.g. kitchen to utility room) — adds £300–£800
- Change boiler type (conventional to combi) — adds £500–£1,500
- Upgrade pipework (e.g. 15mm to 22mm) — adds £200–£500
- Install a new flue (longer run or vertical flue) — adds £100–£350
- Add a magnetic filter (recommended) — adds £80–£150
- Power flush the system (removes sludge) — adds £300–£500
3. Your Location
Labour rates vary significantly across the UK. London and the South East are the most expensive, while the North and Wales tend to be cheaper. Here's a rough breakdown of average total installed costs for a mid-range combi boiler:
| Region | Average Installed Cost (Mid-range Combi) |
|---|---|
| London | £2,600–£3,800 |
| South East | £2,400–£3,400 |
| South West | £2,200–£3,200 |
| East of England | £2,200–£3,200 |
| Midlands | £2,000–£3,000 |
| North West | £1,900–£2,800 |
| North East | £1,800–£2,700 |
| Yorkshire | £1,900–£2,800 |
| Scotland | £2,000–£3,000 |
| Wales | £1,900–£2,800 |
| Northern Ireland | £1,800–£2,700 |
As you can see, the difference between London and the North can be £500–£1,000 for the same boiler and the same job. This is purely down to labour rates and demand. Always get at least three quotes from Gas Safe registered installers in your area.
4. Flue Type and Location
Most boilers use a horizontal flue that exits through an external wall directly behind the boiler. If your boiler is located on an internal wall, or if building regulations require a vertical flue through the roof, costs increase. A standard horizontal flue kit costs £60–£120, while a vertical flue or extended horizontal flue can cost £150–£350.
5. Number of Radiators
More radiators mean a higher-output boiler, which costs more. If you're adding new radiators as part of the installation (e.g. in a loft conversion or extension), budget an additional £200–£400 per radiator including pipework and labour.
When to Replace vs Repair Your Boiler
Not every boiler fault means you need a new one. Many common repairs — replacing a pump, thermostat, or printed circuit board (PCB) — cost £150–£500 and can extend your boiler's life by several years. The key question is whether repairing makes financial sense given the boiler's age and overall condition.
General rule: if repair cost > 50% of a new boiler → Replace
If your boiler is 12+ years old with recurring faults → Replace
The 50% rule is a helpful starting point: if the repair costs more than half of what a new boiler would cost, replacement is usually the smarter move. For a typical new boiler cost of £2,500, that threshold is £1,250. Most individual repairs fall well below this — but if you've spent £800 on repairs in the last two years and now face another £400 bill, the cumulative cost changes the equation.
Boiler age is the other critical factor. The average boiler lasts 10–15 years, with most manufacturers rating them for around 12 years. Beyond this, parts become harder to source, efficiency degrades, and the risk of a complete failure (such as a cracked heat exchanger) increases sharply. If your boiler is over 12 years old, it's often more economical to replace proactively rather than wait for an emergency breakdown in the middle of winter.
Not sure whether to repair or replace your boiler? Use our free Boiler Repair or Replace Calculator to get a personalised recommendation based on your boiler's age, condition, and repair costs. Takes 30 seconds, no sign-up required.
Energy Efficiency — How Much Can a New Boiler Save?
One of the biggest financial arguments for a new boiler is energy efficiency. All modern gas boilers sold in the UK must be condensing boilers with an ErP efficiency rating of at least 92%. Compare this to older non-condensing boilers that typically run at 60–80% efficiency.
What does this mean in real money? According to the Energy Saving Trust, upgrading from an old G-rated boiler (below 70% efficiency) to a new A-rated condensing boiler can save £300–£580 per year on gas bills. Even upgrading from a D-rated boiler (78–82%) saves £100–£200 per year.
Over a 15-year boiler lifespan, that adds up:
- G-rated to A-rated: £4,500–£8,700 lifetime savings
- D-rated to A-rated: £1,500–£3,000 lifetime savings
- B-rated to A-rated: £450–£1,200 lifetime savings
For many households, the energy savings alone pay for the new boiler within 5–8 years. This is why the running cost of older appliances should always be factored into any repair-or-replace decision.
Government Grants and Schemes for Boilers in 2026
Several government-backed schemes can help reduce the cost of a new boiler or heating system:
ECO4 Scheme (Energy Company Obligation)
The ECO4 scheme requires large energy suppliers to fund energy-efficiency improvements in low-income and vulnerable households. If you receive benefits such as Universal Credit, Pension Credit, or Child Tax Credit, and your home has an EPC rating of D, E, F, or G, you may qualify for a free or heavily subsidised boiler replacement. The scheme runs until March 2026, with a possible extension — check with your energy supplier or local council for current eligibility.
Boiler Upgrade Scheme (BUS)
The Boiler Upgrade Scheme offers £7,500 towards an air source heat pump (or £5,000 towards a ground source heat pump) as an alternative to replacing a gas boiler. While this doesn't directly fund a new gas boiler, it makes heat pumps a viable consideration if your home is well-insulated. The scheme was extended to 2028, so there's still time to explore this option.
Local Authority Grants
Many local councils run their own heating grants and schemes, particularly for pensioners, disabled residents, and those in fuel poverty. These are often underpublicised — contact your local council directly or search "boiler grants [your council name]" to check availability.
Warm Home Discount
The Warm Home Discount provides a £150 annual discount on electricity bills for eligible low-income households. While it doesn't directly fund a boiler, it can free up budget for heating costs during and after a boiler upgrade.
Finance Options for a New Boiler
If you can't pay for a new boiler upfront, there are several finance options available in the UK:
- 0% interest boiler finance: Many installers offer 0% finance over 12–24 months on selected boilers. This is the best option if available — you pay the same total price but spread the cost interest-free. Always check for arrangement fees.
- Low-interest boiler finance: Longer-term finance (3–10 years) is available from £30–£60/month, typically at 5–10% APR. Over 10 years, you'll pay significantly more than the cash price, so keep the term as short as you can afford.
- Boiler subscription/rental: Companies like BOXT and British Gas offer boiler subscription plans from £25–£40/month, which include the boiler, installation, annual servicing, and breakdown cover. You don't own the boiler, but there's no upfront cost. Over 10 years, you'll pay £3,000–£4,800 — more than buying outright, but manageable for tight budgets.
- Credit cards: A 0% purchase credit card can be a smart way to spread the cost over 12–24 months interest-free. Make sure you can clear the balance before the promotional period ends.
How to Get the Best Price on a New Boiler
Follow these tips to avoid overpaying:
- Get at least three quotes. Prices vary dramatically between installers. Online comparison sites like Heatable, BOXT, and WarmZilla give instant online quotes, while local Gas Safe engineers often offer competitive rates.
- Don't buy in an emergency. If possible, plan your boiler replacement before your old one fails completely. Emergency callouts in winter can add £200–£500 to the bill, and you'll have less time to shop around.
- Choose the right size. An oversized boiler wastes money on both the purchase price and running costs. Ask your installer for a proper heat-loss calculation, not just a quick estimate based on bedroom count.
- Ask about package deals. Many installers offer discounts if you combine a new boiler with a power flush, magnetic filter, and smart thermostat. A bundled deal can save £100–£300 versus buying separately.
- Check installer accreditations. All boiler installations must be done by a Gas Safe registered engineer. For the best warranty terms, choose an installer who is also accredited by the boiler manufacturer (e.g. Worcester Bosch Accredited Installer, Vaillant Advance Installer). This often unlocks longer warranty periods at no extra cost.
- Time your purchase. Summer (May–August) is the quietest period for heating engineers. You'll often get faster availability and better prices than in the peak autumn/winter rush.
British Gas vs Independent Installers
British Gas is the UK's largest boiler installer, but they're also one of the most expensive. A typical British Gas installation costs £2,800–£4,500 — around 15–30% more than an independent Gas Safe registered installer doing the same job.
What you get for the premium: British Gas offers extended warranties (up to 12 years), finance options, a national support network, and the peace of mind of a large, established brand. For some homeowners, that's worth the extra cost. For others, a well-reviewed local installer with manufacturer accreditation offers the same quality at a significantly lower price.
Online boiler installers like BOXT, Heatable, and WarmZilla have disrupted the market by offering fixed-price online quotes that often undercut both British Gas and local installers. They use networks of Gas Safe engineers and pass on bulk-buying savings. It's worth getting a quote from at least one online installer alongside your local options.
The 2035 Gas Boiler Ban — Should You Still Buy a Gas Boiler?
The UK government's original plan to ban new gas boiler installations from 2025 was pushed back to 2035. This means you can still install a new gas boiler in 2026 — and it will run comfortably for its full 12–15 year lifespan without any regulatory issues.
If you're considering a heat pump as an alternative, the Boiler Upgrade Scheme's £7,500 grant makes it more affordable — but heat pumps work best in well-insulated homes with underfloor heating or large radiators. For most UK homes, a new gas boiler remains the most practical and cost-effective heating solution in 2026.
That said, if you're planning a major renovation or building an extension, it's worth factoring in future-proofing. A hybrid heating system (gas boiler + air source heat pump) gives you the best of both worlds and positions your home well for the transition away from fossil fuels.
Wondering whether to repair your current boiler or invest in a new one? Our free Boiler Repair or Replace Calculator considers your boiler's age, efficiency, repair history, and current UK prices to give you a clear answer in seconds.
Frequently Asked Questions
How much does a new combi boiler cost installed?
A new combi boiler costs between £1,800 and £3,500 fully installed in the UK in 2026. A budget combi boiler such as the Baxi 200 costs around £1,800–£2,200 installed, a mid-range model like the Ideal Vogue Max costs £2,200–£2,800, and a premium boiler like the Worcester Bosch 8000 Life costs £2,800–£3,500. Prices include the boiler, installation labour, and VAT.
What is the cheapest boiler to install in the UK?
The cheapest boilers to install in the UK in 2026 are budget combi boilers from brands like Baxi and Ideal. A Baxi 200 combi boiler can be installed from around £1,800, while an Ideal Logic+ starts from approximately £1,900. These are reliable, well-reviewed boilers that suit smaller homes with one bathroom. Prices include standard installation and VAT.
How long does a boiler installation take?
A straightforward like-for-like boiler swap typically takes 1 day (6–8 hours). If you're changing boiler type (e.g. from conventional to combi), relocating the boiler, or upgrading pipework, the installation can take 2–3 days. Complex installations involving new cylinder removal, additional radiators, or system upgrades may take up to 4 days. Your installer should give you a clear timeline before starting work.
Can I get a free boiler replacement in the UK?
You may be eligible for a free or heavily subsidised boiler replacement through the ECO4 scheme if you receive certain benefits (Universal Credit, Pension Credit, Child Tax Credit, etc.) and your home has a low energy efficiency rating. Some local councils also run boiler replacement grants. The Boiler Upgrade Scheme (BUS) offers £7,500 towards an air source heat pump as an alternative to a gas boiler. Contact your local authority or check the GOV.UK website for current eligibility criteria.
Is it worth getting a new boiler in 2026?
If your current boiler is over 10–12 years old, frequently breaking down, or has an efficiency rating below 86%, a new boiler is almost certainly worth the investment. A modern A-rated condensing boiler runs at 92–94% efficiency, which can save £200–£400 per year on gas bills compared to an older model. Over 10–15 years, this adds up to £2,000–£6,000 in savings — often more than the cost of the boiler itself. The 2025 gas boiler ban was pushed back to 2035, so installing a new gas boiler in 2026 is still a practical choice.
How much does British Gas charge to fit a new boiler?
British Gas typically charges £2,800–£4,500 for a new boiler installation in 2026, depending on the model and complexity. This is generally 15–30% more expensive than independent Gas Safe registered installers, who charge £1,800–£3,500 for equivalent work. British Gas does offer finance options, extended warranties (up to 12 years), and the convenience of a national brand, which some homeowners prefer.
What size boiler do I need for my house?
Boiler size depends on the number of bedrooms, bathrooms, and radiators in your home. For a 1–2 bedroom flat or house with 1 bathroom, a 24–27kW combi boiler is sufficient. A 3-bedroom house with 1 bathroom needs a 28–30kW combi, while a 4+ bedroom house with 2 or more bathrooms needs a 32–38kW combi or a system boiler with a hot water cylinder. An undersized boiler won't heat your home properly; an oversized one wastes energy. Ask your installer to do a full heat-loss calculation for the most accurate recommendation.