How Much Does a New Boiler Cost UK

How Much Does a New Boiler Cost in the UK? (2026 Prices and Grants)

A new boiler in the UK costs between £1,800 and £4,500 fully installed in 2026. For a standard like-for-like combi boiler replacement, most homeowners pay around £2,300 to £2,500, based on real installation quote data from this year. The type of boiler, your property size, and the complexity of the job all push that figure up or down.

Important — please read before you continue: InstantGrant is an independent grant information and application-support service. We are not the UK government, Ofgem, or any funding body. We do not award grants, and we cannot guarantee your eligibility for any scheme. All grant information on this page is based on data pulled directly from GOV.UK. Always confirm your eligibility on GOV.UK or directly with your energy supplier before committing to any installation work.

Before you focus on the price alone, there is one question worth answering first: does a government grant apply to your situation? If it does, your actual out-of-pocket cost could look very different to the headline figures. And if it does not, knowing that now saves you time chasing schemes that simply do not fit.

This guide covers both questions in full.

New Boiler Costs in 2026: Prices at a Glance

A new boiler fully installed in the UK in 2026 ranges from £1,800 for a basic combi swap up to £6,000 or more for a complex system conversion. The figures below cover the boiler unit, labour from a Gas Safe registered engineer, a standard flue, and basic controls.

A straightforward combi swap in a mid-sized terraced or semi-detached house, with the boiler staying in the same location, is the cheapest scenario. Every additional complication adds cost.

Combi Boiler Costs

Around 80 percent of UK homes run on a combi boiler. Combi boilers heat water on demand directly from the mains, with no need for a hot water cylinder or storage tank. A like-for-like combi replacement in 2026 averages £2,300 to £2,500 based on real quote data from thousands of installations.

System Boiler Costs

System boilers use a pressurised hot water cylinder and suit larger homes with more than one bathroom. The cylinder adds cost compared to a combi setup, pushing installed prices to between £2,200 and £5,000 depending on the cylinder size, boiler output, and property.

Conventional Boiler Costs

Conventional or regular boilers, most common in older properties, need both a hot water cylinder and a cold water storage tank in the loft. Replacing one costs between £2,000 and £4,500 installed, depending on how much of the existing pipework needs updating.

What Pushes Your Boiler Quote Higher

Several factors move your quote above the average installed price. Understanding them helps you read a quote accurately and avoid being overcharged.

Boiler Brand and Output Rating

Entry-level boilers from Worcester Bosch, Vaillant, or Viessmann start around £600 to £900 for the unit alone. Mid-range models with 7 to 10-year warranties sit between £900 and £1,500. Premium models with smart controls and extended warranties reach £2,000 or more before installation is factored in.

Moving or Relocating the Boiler

Relocating a boiler to a different room, or even across the same room, adds new pipework and flue routing. Expect an additional £300 to £1,000 depending on the complexity of the job.

System Conversion Work

Converting from a regular or back boiler system to a combi is one of the more involved installation types. It involves removing the existing cylinder and loft tank, re-routing pipework, and sealing off redundant connections. Total installed costs for this type of work often sit between £3,500 and £6,000.

Powerflush

If your existing heating system has sludge buildup in the pipework, most boiler manufacturers require a powerflush or chemical clean before installation to protect the new unit's warranty. This adds between £300 and £600 in most cases.

Regional Labour Rates

London and the South East typically carry 15 to 20 percent higher labour costs than the North, Scotland, or Wales. The same job in Leeds will usually be noticeably cheaper than the same job in central London.

UK Government Boiler Grants in 2026

This is where most boiler cost guides get confusing. The phrase "boiler grant" gets used loosely online, and it leads many people to expect a government payment towards a gas boiler replacement that does not actually exist in that form. Here is what the UK government actually offers in 2026.

Boiler Upgrade Scheme (BUS): £7,500

The Boiler Upgrade Scheme gives eligible homeowners £7,500 off the installed cost of an air source or ground source heat pump, or a biomass boiler in rural areas. The grant is deducted directly from your installer's quote. You never handle the money yourself.

What the BUS does not do is contribute towards a new gas boiler. If you are replacing a gas boiler with another gas boiler, this scheme does not apply to you.

To qualify you need to:

• Own the property in England or Wales

• Be replacing a fossil fuel heating system (gas, oil, LPG, or electric)

• Have a valid EPC with no outstanding loft or cavity wall insulation recommendations

• Use an MCS-certified installer who applies for the grant on your behalf

The scheme is open until 2030. There is no income test or benefits requirement.

ECO4: Fully Funded for Eligible Households

ECO4 is the government scheme delivered through large energy suppliers for households on means-tested benefits. If someone in your home receives Universal Credit, Pension Credit, or certain other qualifying benefits, and your home is rated EPC band D to G, you may qualify for fully funded measures including, in some cases, boiler repair or replacement.

ECO4 closes on 31 December 2026. If you think you may qualify, the time to act is now. Applications submitted close to the deadline may not complete before the scheme ends.

Councils can also refer lower-income households through ECO4 Flex, even without qualifying benefits, if the household meets local criteria for fuel poverty.

Warm Homes: Local Grant

This is a council-led scheme running to 2028, targeted at lower-income households in participating local authority areas in England. It covers insulation, low-carbon heating, and solar for homes rated EPC D to G. Eligibility is based on household income under £36,000, or the home sitting within a designated low-income postcode area.

Which Grant Applies to You? A Clear Decision Guide

If You Do Not Qualify for Any Grant

Many households replacing a gas boiler with a new gas boiler, and not receiving qualifying benefits, will not be eligible for any of the national schemes above. That is the honest answer most competitor guides avoid stating clearly. In that situation, your practical options are as follows.

Get Three Quotes Minimum

Prices for identical boiler installations vary by 30 to 50 percent between installers. The difference between the cheapest and most expensive quote for the same job can exceed £1,000. Always verify your installer's Gas Safe registration at gassaferegister.co.uk before booking.

Check Your Local Council

Many councils run their own smaller heating support schemes, especially for older residents, disabled householders, and those in fuel poverty. Your council's website or housing team is the right starting point.

Consider 0 Percent Finance

Most boiler installers offer interest-free finance deals for 12 months. This spreads the upfront cost without adding to the total, as long as the balance clears within the interest-free period.

Time the Replacement

If your boiler is failing but still running, getting quotes in spring or summer, when installers are less busy, often results in better pricing than an emergency winter replacement where you have no negotiating position.

The 2035 Gas Boiler Phase-Out: Does It Affect Your Decision Now?

The UK government has confirmed that new gas boilers will not be permitted in newly built homes from 2025 under the Future Homes Standard. For existing properties, replacement gas boilers remain fully legal until 2035.

Should You Switch to a Heat Pump Now?

A new gas boiler installed in an existing home in 2026 will give you at least a decade of compliant use before the 2035 deadline. A good mid-range boiler with annual servicing typically lasts 12 to 15 years.

Heat pumps work most efficiently in well-insulated homes. If your property has poor wall insulation, single glazing, or undersized radiators, the economics of switching now are less straightforward, and the £7,500 BUS grant may not cover the full cost gap between gas and heat pump installation.

"Free Boiler" Scams: How to Protect Yourself

Searches for boiler grants attract significant scam activity. Cold calls, unsolicited texts, and social media adverts claiming to offer a "free government boiler" are widespread. Some are legitimate lead-generation services; many are not.

How to Spot a Scam

• Legitimate UK government grants never ask for an upfront payment to release funding

• You will not be randomly selected for a boiler grant you never applied for

• Any genuine scheme referencing free boiler replacement will always ask eligibility questions before confirming you qualify

• Websites mimicking GOV.UK branding but using a different domain are a serious warning sign

What to Do If You Are Unsure

Verify any scheme name directly against GOV.UK before giving your personal or bank details to anyone. Report suspected grant fraud to Action Fraud at actionfraud.police.uk or by calling 0300 123 2040.

Frequently Asked Questions

How much does a new boiler cost in the UK in 2026? A new boiler costs between £1,800 and £4,500 fully installed in 2026. A standard combi boiler replacement averages around £2,300 to £2,500. System boilers, conversions, and larger properties cost more.

Can I get a government grant for a new gas boiler? Not directly. The main national grant in 2026, the Boiler Upgrade Scheme, covers heat pumps and biomass boilers, not gas boilers. ECO4 can fund boiler work for households on qualifying benefits, subject to energy supplier availability.

What is the Boiler Upgrade Scheme? The Boiler Upgrade Scheme is a UK government grant of £7,500 off the installed cost of an air source or ground source heat pump, for homeowners in England and Wales replacing fossil fuel heating. It is open until 2030 with no income or benefits test.

What is ECO4 and when does it close? ECO4 is the Energy Company Obligation scheme, delivered by large energy suppliers, which funds home energy improvements including boiler work for households on means-tested benefits. It closes on 31 December 2026.

Is a new boiler worth it if mine is still working? It depends on its age and efficiency rating. A boiler more than 15 years old is likely running at 60 to 70 percent efficiency. A modern A-rated condensing boiler runs at over 90 percent. The energy saving often justifies replacement before the boiler breaks completely, and you avoid the premium cost of an emergency winter installation.

How do I know if a free boiler offer is genuine? Genuine UK government schemes have specific eligibility criteria, are verifiable on GOV.UK, and will never request upfront payment. If someone tells you that you qualify without asking any eligibility questions, verify the scheme independently before sharing any details.

Does a new boiler improve my EPC rating? Yes. Replacing an older G-rated boiler with a modern A-rated condensing model is one of the more impactful single EPC improvements. Switching to a heat pump improves it further by removing gas dependency entirely.

How InstantGrant Can Help

Understanding which scheme applies to your situation, and whether the timing is right to act, takes more than reading a price guide.

InstantGrant is an independent information and application-support service. We help UK homeowners understand their grant eligibility, navigate the application process, and avoid the mistakes that cost time and money.

We are not the government, Ofgem, or any funding body. We do not award grants and we do not guarantee any outcome. What we do is help you approach the right scheme, at the right time, with the right information.

[Check your eligibility at instantgrant.co.uk]