How much does a new boiler cost in the UK in 2026?

A new combi boiler costs £1,500 to £3,500 for the unit, a system boiler £1,500 to £3,000, and a regular boiler £1,500 to £2,500. Installation adds £500 to £1,500 for a like-for-like swap or £2,000 to £4,000 if changing system type or relocating the unit. A typical installed price for a like-for-like combi replacement falls in the £2,000 to £5,000 range.

Should I get a heat pump instead of a new boiler?

It depends on three factors: insulation level (heat pumps need a well-insulated home to run efficiently), upfront budget (£8,000-£15,000 before the £7,500 BUS grant; £500-£7,500 after), and grid-vs-gas price differential (currently mains gas is cheaper per kWh, so payback rests on the BUS grant plus the 5x workmanship warranty plus future grid electricity decarbonisation). For a well-insulated home where the heating system is end-of-life and BUS qualifying, a heat pump is often the better all-in deal.

New Boiler Costs UK 2026

The 60-second answer

Unit price by type: combi £1,500–£3,500, system £1,500–£3,000, regular £1,500–£2,500. Premium-brand models sit at the top of each range.
Installation: £500–£1,500 like-for-like, £2,000–£4,000 if changing type or relocating.
All-in typical: £2,000–£5,000 for a straightforward combi replacement, more if your system is changing or your home is in London/South East.
Boiler grants: very limited. ECO4 closed March 2026. BUS only covers heat pumps (£7,500). For most homeowners, you pay for the boiler yourself.
Payback vs heat pump: a heat pump under the BUS grant often lands at similar all-in cost to a new gas boiler. The deciding factor is insulation level, not the headline price.

Independent information

Cost ranges on this page are drawn from the Energy Saving Trust (2024 figures), ONS labour cost data, Gas Safe Register installer pricing surveys, and published manufacturer guide prices. We are not a boiler installer and do not issue quotes. For accurate pricing on your property, get three written quotes from Gas Safe registered engineers — verify their registration at gassaferegister.co.uk.

The honest landscape for a 2026 boiler buyer

If you're replacing a boiler in 2026, three policy facts shape the decision and most boiler installer websites won't tell you them straight.

The 2035 new-build gas ban applies to new-build only. From 2035, new homes in England cannot be built with a gas connection. This does not affect existing homes. You can replace the boiler in a Victorian terrace, a 1970s semi, or a 2010 cul-de-sac estate house indefinitely under current policy. The phrase "gas boiler ban" gets quoted often; what it actually means is far narrower than the framing suggests.

The off-gas-grid fossil fuel ban has been delayed. A 2026 ban on new oil and LPG boilers in properties not on the gas network was widely briefed, then pushed back. As of May 2026, no statutory date is fixed. Off-gas-grid homes can fit new oil and LPG boilers, though the direction of travel — towards heat pumps for off-gas-grid replacement — is clear.

The £7,500 Boiler Upgrade Scheme runs until 2028. If you're replacing a gas, oil or LPG heating system with a heat pump, you can claim £7,500 from BUS via your MCS-certified installer. The grant has been topped up twice since launch and the budget is sufficient. The scheme does not cover gas boilers, only heat pumps.

What this means for the decision in front of you: a new condensing gas boiler installed in 2026 will run for its expected 12-15 year life without policy intervention. A heat pump installed in 2026 with the BUS grant offsets most of the price premium and future-proofs against electricity decarbonisation. The choice is mostly about your home's insulation and your appetite for the slightly longer installation window — not about urgency around any boiler ban.

Boiler costs by type

Three boiler types account for almost every UK domestic installation. The price range within each type reflects manufacturer tier (budget brand to premium), heat output (kW), and feature set (smart controls, weather compensation, hot water storage). Unit prices below exclude installation.

Combi

Combi boiler

Most common choice — heating and hot water in one unit, no separate cylinder needed.

Budget £1,500–£2,000

Mid-range £2,000–£2,800

Premium £2,800–£3,500

Best for: 1–3 bedroom homes with one bathroom and moderate hot water demand. Frees up airing-cupboard space; no risk of running out of hot water mid-shower if sized correctly.

System

System boiler

Heating plus a separate hot water cylinder. Handles multiple bathrooms in use simultaneously.

Budget £1,500–£2,000

Mid-range £2,000–£2,500

Premium £2,500–£3,000

Best for: 4+ bedroom homes, multiple bathrooms, or households with high simultaneous hot water demand. Pairs naturally with solar thermal or heat pump retrofits in future because the cylinder is already in place.

Regular

Regular boiler

Traditional system with feed tank in the loft and hot water cylinder. Common in older homes.

Budget £1,500–£1,800

Mid-range £1,800–£2,200

Premium £2,200–£2,500

Best for: Replacement-in-kind in older homes where the existing system uses tanks and cylinder, low water pressure areas, or properties on poor mains pressure. Cheaper unit, but the existing tankwork adds maintenance overhead.

Brand pricing — typical premium

Within each type, brand commands a 30–50% premium at the top end. Worcester Bosch, Vaillant, Viessmann and Ideal sit in the premium tier; Baxi, Glow-worm, Potterton, and Alpha sit in mid-range; budget tier covers Main, Vokera, and Ravenheat. Warranty length scales with price: 10 years on most premium installations (subject to annual servicing), 5–7 years on mid-range, 2–5 years on budget. Premium boilers cost more upfront and typically offer better modulation (variable flame size matching demand) and lower part-load efficiency loss.

Installation costs in detail

Installation cost is driven mostly by complexity — same location and type is cheap, anything that involves rerouting pipework or removing a cylinder costs more. Engineers commonly quote a fixed install price separate from the boiler unit; some quote a single all-in figure. Ask for itemisation.

Simple swap

Like-for-like swap

£500–£1,500

Same boiler type, same location. Existing flue, gas supply pipework, and water connections reused with minor adjustments. The cheapest and most common scenario.

Same boiler type (combi→combi, system→system)
Same physical location
Existing flue retained (subject to compatibility check)
Typically completed in 1 day, sometimes 2 for awkward access
Includes commissioning, pressure-test, Gas Safe registration

Bigger scope

System change or relocation

£2,000–£4,000

Changing boiler type (regular→combi removes tanks/cylinder), relocating the unit, or replacing major pipework. 2–3 days work, sometimes 4 for full system overhaul.

Changing boiler type — typically removing tank and cylinder
Relocating to a different room or floor
New flue routing — vertical, longer horizontal, or twin-wall
Gas supply pipe upgrade (typically 22mm→28mm where required)
Building Regulations notification via Gas Safe

What's in a real installation quote

A well-itemised Gas Safe quote will line out:

Boiler unit + manufacturer warranty: the unit cost plus any extended warranty offered
Labour (typically 1–3 days): at £200–£400 per engineer-day, varies by region
Flue kit + installation: £150–£500 depending on routing
Pipework + connections: gas, water, condensate disposal — £100–£500
Controls: thermostat, programmer, smart hub — £100–£500 depending on choice
System extras: magnetic filter (£100–£200, recommended), power flush (£300–£600 on older systems with sludge)
Removal and disposal: of old boiler, tanks, cylinder — £50–£200
Commissioning + certification: Gas Safe registration, Building Control notification, benchmark commissioning record

What affects your quote

Location and regional labour rates

ONS labour cost data shows engineering services in London and the South East priced 15-25% above the North of England, Wales, and Scotland. Same boiler, same install scope, different invoice. Detail below in the Regional Variance section.

Flue type and routing

Standard horizontal flue: cheapest. Vertical through roof: +£200-£500 plus possible scaffolding. Longer horizontal runs in solid-wall properties (more wall break-through): +£100-£300. Twin-wall flue (required for older properties or unusual configurations): higher still.

Gas supply pipework

Older homes commonly have 15mm or 22mm gas supply runs. Many new condensing boilers require 22mm or 28mm. If the engineer needs to upsize the gas pipe back to the meter, that's £200-£600 depending on the run length and floor access.

Boiler size (kW)

Sizing matters more than people think. 24-30 kW suits most 3-bed homes; 30-35 kW for 4-bed with two bathrooms. Oversizing burns more gas per cycle and shortens boiler life. A heat-loss calculation costs nothing if your engineer does it properly during the quote stage.

Controls and smart heating

A wired thermostat costs £30-£80. A smart thermostat with app control (Hive, Nest, Tado, Honeywell Evohome) costs £150-£500 depending on zoning. Weather-compensation controls (which save 5-15% on running costs) add £100-£300 but require boiler compatibility.

Power flush and system protection

Older systems with sludge or rust risk damaging the new boiler. A power flush (£300-£600) is often required by manufacturer warranty. A magnetic filter (£100-£200, e.g. MagnaClean) catches future sludge. Both are non-negotiable on premium installations — refusing them voids warranty.

Condensate disposal

Condensing boilers produce acidic waste water that must drain to a sealed waste route. Adding a condensate pump (where the route doesn't allow gravity drainage) costs £100-£250 plus installation. Required for cellars, garages, or upstairs installations without nearby drainage.

Building Regulations and certification

Gas Safe registered engineers notify Building Control automatically via the Gas Safe Register. The certificate ("Benchmark") is required for the manufacturer warranty to be valid and for the boiler to be sold-with-property. Always insist on the paperwork before final payment.

Regional variance — actual numbers

The same boiler installed in Newcastle and Greater London is not the same price. Labour rates, parking and access costs, and central-zone congestion charges drive a consistent 15-25% regional premium for the South East. Below: typical installed prices for a like-for-like mid-range combi (Worcester Bosch 4000, 30 kW class) — same unit, same install scope, across UK regions.

Region	Typical installed price	vs UK average
London (Zones 1-2)	£3,500-£4,200	+20-25%
London (Outer) + South East	£3,200-£3,800	+10-15%
South West	£2,800-£3,400	UK average
East of England	£2,900-£3,500	+2-5%
Midlands (East + West)	£2,700-£3,200	-5%
North West	£2,500-£3,000	-10%
Yorkshire and the Humber	£2,500-£3,000	-10%
North East	£2,400-£2,900	-15%
Scotland	£2,500-£3,100	-8%
Wales	£2,500-£3,000	-10%
Northern Ireland	£2,400-£2,900	-15%

Three factors drive the spread. First, engineer day rates: London engineers commonly bill £350-£500 per day; North East and Scotland commonly £200-£300. Over a 1-2 day install, that compounds into £100-£400 of pure labour-rate difference. Second, parking and congestion: central London engineers factor £40-£80 per day for parking and access permits into quotes. Third, supply chain density: fewer competing installers in rural areas means less downward pricing pressure, but lower commercial rent and lifestyle costs typically still keep the headline figure below the South East.

Tip: if you're on the edge of a London postcode, get quotes from installers based in the next ring out. A Surrey-based or Hertfordshire-based engineer driving in for the day will often be 10-15% cheaper than a Greater London brand, with no quality difference. Same logic in Greater Manchester, Birmingham, and central Edinburgh.

Repair or replace?

The decision usually hinges on three variables: age, recent breakdown history, and repair cost relative to replacement. The 50% rule is a useful shorthand — if the quoted repair is over 50% of replacement cost, replace.

Repair

Repair is usually the call when

Boiler under 10 years old and well-serviced
Repair quote under £500
First or second breakdown in 12 months
Parts still available for your model
System otherwise efficient and EPC band stable
Manufacturer warranty still active

Replace

Replacement is usually the call when

Boiler over 12–15 years old
Repair quote over £500 and/or third call-out in 12 months
Non-condensing model (typically pre-2005)
Repair cost more than 50% of replacement
Rising bills suggest declining efficiency
Parts becoming hard to source
Considering a heat pump anyway — replace once

Efficiency upside: the Energy Saving Trust estimates that replacing an old G-rated boiler with a modern A-rated condensing model saves a typical household £200–£400 per year in gas bills. Over a 12-year boiler lifespan that's £2,400–£4,800 of savings — often enough to cover the replacement cost on its own, especially if your old boiler is also breakdown-prone.

Boiler versus heat pump — the honest comparison

The single most-asked question on this page. The answer depends on your home, not on the headline price. Below: the comparison at four levels — upfront, running cost, payback, and future-proofing.

Factor	New gas boiler	Air source heat pump
Upfront cost (installed)	£2,000–£5,000	£500–£7,500 (after £7,500 BUS grant)
Installation time	1–2 days	2–5 days
Government grant	None	£7,500 (BUS, until 2028)
Typical annual running cost (3-bed)	£1,200–£1,800 (gas)	£900–£1,400 (electricity, well-insulated home)
Workmanship warranty	1–2 years typical	10 years (MCS standard via OVO etc.)
Insulation requirements	None specifically	Well-insulated (EPC C or above ideal)
Hot water provision	Combi instant; system/regular via cylinder	Cylinder required (no combi heat pump)
Future-proofing	Existing homes can fit indefinitely	Aligned with grid decarbonisation

Upfront comparison: a like-for-like combi boiler replacement runs £2,000-£5,000 installed. A heat pump install costs £8,000-£15,000 before the £7,500 BUS grant — so £500-£7,500 net to the homeowner after the grant. The ranges overlap. In many properties a heat pump under BUS is cheaper than a premium boiler installation.

Running cost reality: the headline "gas is cheaper per kWh than electricity" is correct under current pricing, but heat pumps deliver 3-4 kWh of heat per 1 kWh of electricity (Seasonal COP of 3.0-4.0 in well-insulated homes). The arithmetic — at Ofgem's current default cap of roughly 6p/kWh gas and 24p/kWh electricity — works out to broadly comparable running costs for a well-insulated home, often slightly lower for the heat pump. In a poorly-insulated home, the heat pump's COP drops to 2.0-2.5 and the gas boiler wins. The insulation question is therefore the decisive one.

Payback math (10/15/20 year): assuming a well-insulated 3-bed home using ~12,000 kWh of heat per year, gas at 6p/kWh, electricity at 24p/kWh, heat pump SCOP 3.5, gas boiler efficiency 92%:

Annual heat cost on gas boiler: 12,000 ÷ 0.92 × £0.06 = ~£783
Annual heat cost on heat pump: 12,000 ÷ 3.5 × £0.24 = ~£823
Net running cost difference: ~£40/year more for the heat pump (current prices)

On these numbers, running costs are broadly even. Payback is therefore driven by upfront price difference and grid electricity decarbonisation. Average UK grid carbon intensity has fallen from 281gCO2/kWh in 2020 to under 150gCO2/kWh today and continues to fall — meaning a heat pump installed today gets cleaner every year, while a gas boiler's emissions remain constant.

The RdSAP quirk worth knowing: swapping a high-efficiency gas boiler for a heat pump can sometimes lower the SAP score on your EPC, because RdSAP uses fixed fuel-cost assumptions that haven't kept pace with grid decarbonisation. This is a methodology artefact, not a real-world cost difference. The SAP 11 update due before the end of the decade is expected to address it. See EPC ratings explained for detail.

When the heat pump genuinely wins:

Your home is already at EPC C or above (well-insulated)
Your existing heating system is end-of-life and you're replacing anyway
You qualify for the £7,500 BUS grant (England or Wales)
You value the 10-year workmanship warranty and aligned net-zero positioning
You're staying in the property 7+ years

When the gas boiler is the right call:

Solid-walled property at EPC D or below without imminent insulation upgrade
Tight upfront budget — you need the cheapest installed price now
Selling within 5 years — you may not recoup the heat pump premium at sale
Off-gas-grid currently and gas connection coming via local network expansion

OVO offers MCS-certified heat pump installation with the BUS grant claimed on your behalf, and a 10-year workmanship warranty (5× the typical 1-2 years on a boiler installation). The economics of the BUS grant route make a heat pump worth modelling against the boiler for any home at EPC C or above.

Finance options — and the math behind them

Most boiler buyers can't write a £3,000 cheque without notice. Four finance routes cover most situations; the math on each varies sharply.

0% finance

0% finance — sometimes genuinely 0%

Some manufacturers and installers offer 0% interest over 12–24 months on new boiler purchases. Genuine 0% offers are real but variable in quality.

The test: ask for the cash price and the finance price separately. If they're identical, the 0% is genuine — the lender takes a cut from the installer and the customer pays no markup. If the finance price is higher than the cash price, you're paying packaged interest. Total cost over the term divided by the number of months is your real monthly cost — compare against the cash price for the same boiler.

Subscription

Boiler subscription / pay-monthly plans

Several energy suppliers and dedicated subscription providers (British Gas Homecare boiler-cover with replacement, HomeServe, Boxt, Hometree) bundle the boiler, installation, and annual servicing into a monthly fee — typically £40–£70/month over 5–10 years.

The math: £55/month × 120 months = £6,600 total. The same boiler bought outright with annual servicing costs £3,000–£4,000 over the same period including £80–£120/year for annual service. The subscription premium is £2,000–£3,000 for the convenience of guaranteed servicing and breakdown cover. Worth it if you value the certainty; expensive if you'd rather take the risk and bank the difference.

Consumer credit

Consumer credit (personal loan, credit card)

A personal loan from a high-street lender at 6–12% APR over 3–5 years is often cheaper than installer finance once the markup is factored in.

Example: £3,000 over 3 years at 8% APR = total cost £3,373 (£94/month). Compare to installer-finance offering £3,400 cash price packaged as 0% finance — same total cost, but the loan gives you cash discount leverage. Shop for the cash price first, then arrange finance.

Local grants

Local authority emergency heating grants

ECO4 closed to new applications in March 2026. The successor for insulation is GBIS (Great British Insulation Scheme) — but GBIS does not fund boilers, only insulation measures.

The current routes for funded boiler replacement: the Household Support Fund (council-administered, varies by local authority — typically for income-tested vulnerable households), Warm Homes Discount (one-off £150 credit against energy bills, not boiler replacement), and council-led emergency heating schemes (limited and discretionary). For a fully-funded heating replacement at scale, the heat pump route under BUS is currently the only national programme.

Check your grant eligibility

If you're considering a heat pump under BUS, the widget below queries the live MHCLG EPC register and routes you through the grant eligibility check. Direct boiler grants are limited; the heat pump route via BUS is the main funded path.

Grant scheme overview

Check if you qualify for the £7,500 heat pump grant

MHCLG register lookup plus BUS eligibility check in one. Postcode-driven, no obligation.

up to £7,500

Grant available

Key eligibility factors:

Replacing gas/oil/LPG boiler
Property suitable for heat pump
England or Wales

Check your property against the live MHCLG EPC register to see your current band and every grant you qualify for — free, in under a minute.

Check your property

Get boiler replacement quotes

Tell us your postcode and current boiler type. We will route you to Gas Safe registered engineers in your area for accurate, no-obligation quotes. Single-enquiry routing — your details go to one matched installer, not a list of cold callers.

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Annual obligation

Annual gas safety certificate (CP12)

A new boiler is one cost. The annual gas safety check is the recurring one. Landlords are legally required to have a current CP12 certificate for every rental property — issued only by a Gas Safe registered engineer. Homeowners are not required to but most replace one each year alongside servicing. Order a standalone gas safety check online for a fixed price.

CP12 certificates for landlords and homeowners
Gas Safe registered engineer (legal requirement)
Fixed price, completed within days

Order a gas safety certificate →

Via energyperformancecertificates.co.uk

Why Gas Safe registration matters

Only Gas Safe registered engineers can legally work on domestic gas appliances in the UK. The register replaced CORGI in 2009 and is administered by the HSE (Health and Safety Executive). Hiring an unregistered engineer is illegal and uninsured — your home insurance is likely to refuse claims arising from non-Gas Safe work.

Every Gas Safe registered engineer carries an ID card with their photo, registration number, registered business, and the specific gas work categories they are qualified to perform. The card should be shown to you on arrival; you can also verify their registration in real time at gassaferegister.co.uk by entering their name, business, or postcode.

Three things to check before signing a contract: (1) the engineer's Gas Safe ID covers the work they're quoting for (e.g. natural gas + central heating boiler); (2) they will notify Building Control via the Gas Safe Register when the install is complete (this is automatic, but you should receive a Building Regulations Compliance Certificate in the post within a few weeks); (3) you receive the Benchmark Commissioning Record signed by the engineer — required for manufacturer warranty.

Recommendation channels matter less than verification. NextDoor and Facebook local groups produce genuinely useful installer recommendations, but always cross-check the Gas Safe Register and ask for two written quotes before committing.

Frequently asked questions

Is it cheaper to repair or replace a boiler?

If your boiler is under 10 years old, the repair cost is under £500, and breakdowns are infrequent, repair usually wins. If the boiler is over 12 years old, repairs are over £500, or you've had multiple call-outs in 12 months, replacement is usually more cost-effective. The 50% rule applies: if repair quotes exceed 50% of replacement cost, replace.

Is a boiler still worth fitting given the gas phase-out?

Yes, with caveats. The 2035 new-build gas connection ban applies only to new-build properties; existing homes can continue to fit gas boilers indefinitely under current policy. The off-gas-grid fossil fuel ban (originally 2026, delayed) is also not in force. A new boiler installed in 2026 has a 15-year working life ahead of it.

Should I get a heat pump instead?

It depends on three factors: insulation level (heat pumps need a well-insulated home to run efficiently), upfront budget (£8,000-£15,000 before the £7,500 BUS grant; £500-£7,500 after), and grid-vs-gas price differential. For a well-insulated home where the heating system is end-of-life and BUS qualifying, a heat pump is often the better all-in deal.

How long does boiler installation take?

A like-for-like swap typically takes one day, sometimes two if access is awkward. Changing boiler type (regular to combi, or relocating the unit) takes 2-3 days because of additional pipework and the removal of tanks or cylinders.

Are there grants for a new gas boiler?

Direct boiler grants are now limited. ECO4 closed to new applications in March 2026. Some local authorities still operate emergency heating grants for vulnerable households via Household Support Fund or council-led schemes. The £7,500 Boiler Upgrade Scheme applies to heat pumps, not gas boilers.

What size boiler do I need?

Boiler sizing is measured in kilowatts (kW). For a typical 3-bedroom home with one bathroom, a 24-30 kW combi is usually sufficient. Larger homes (4+ bedrooms, 2+ bathrooms) need 30-35 kW or a system boiler with a separate cylinder. Oversizing wastes fuel and money. A Gas Safe engineer should perform a proper heat-loss calculation, not just match the existing boiler's rating.

Is 0% finance on boilers really 0%?

Sometimes yes, sometimes not. Compare the cash price with the finance price. If they're identical, the 0% is genuine. If the finance price is higher, you're paying interest packaged as a price markup. Check the total cost over the term and divide by months — that's your real monthly cost.

Do boiler installation costs vary by region?

Yes. London and the South East typically cost 15-25% more than the North of England, Wales, or Scotland for the same installation. See the Regional Variance section above for the full breakdown.

What is a Gas Safe registered engineer?

Gas Safe is the official UK register of qualified gas engineers, replacing CORGI in 2009. By law, only Gas Safe registered engineers can legally work on domestic gas appliances in the UK. The register is searchable at gassaferegister.co.uk by postcode or business name.

How long does a new boiler last?

A well-maintained modern condensing boiler typically lasts 12-15 years, with some reaching 20 years under good service conditions. Annual servicing extends life and protects warranty. The warranty itself (5-10 years on most manufacturers) is a useful proxy for expected reliable life.

What is a CP12 and do I need one?

A CP12 is a Landlord Gas Safety Certificate, legally required annually for every rented property in the UK. Homeowners aren't legally required to have one, but most boiler warranties require annual servicing, which often produces a CP12-equivalent record. Issued only by Gas Safe registered engineers.

Which boiler brand is best?

Worcester Bosch, Vaillant, and Viessmann consistently rate highest in Which? reliability surveys, with 10-year warranties available on premium models. Ideal sits just below at mid-range. Baxi and Glow-worm are reliable mid-market options. Budget brands (Main, Vokera, Ravenheat) save money upfront but typically carry 2-5 year warranties and shorter service lives.