Free Boiler Grant UK 2026: ECO4 Eligibility and How to Apply

If your boiler is old, inefficient or has broken down, replacing it can be a significant household expense.

Some households in England, Scotland and Wales may be able to receive help with heating improvements through the Energy Company Obligation scheme, known as ECO4.

You may see this support advertised online as a “free boiler grant”, but it is important to understand how the scheme actually works.

ECO4 is not technically a government grant paid directly to householders. Energy suppliers have obligations to fund energy-efficiency improvements in eligible homes, and the amount of support offered can vary. In some cases the work may be fully funded, while in others a contribution may be required.

As of October 2026, ECO4 has been extended until 31 December 2026. Funding and installation capacity are limited, so anyone who believes they may qualify should check their options as soon as possible.

What Is ECO4?

ECO4 is the fourth phase of the UK government’s Energy Company Obligation.

It operates across Great Britain — England, Scotland and Wales — and is designed primarily to improve homes with poor energy efficiency and support households experiencing fuel poverty.

Rather than giving money directly to households, the scheme places obligations on certain energy suppliers to arrange and fund eligible energy-efficiency improvements.

These can include measures such as:

Insulation
Heating improvements
First-time central heating
Heating controls
Renewable heating
District heating connections
Certain boiler repairs or replacements

ECO4 follows a more comprehensive whole-house approach, so an assessor may recommend several improvements rather than simply replacing a boiler. Ofgem

Does ECO4 Really Offer Free Boilers?

Potentially, but not everyone who qualifies for ECO4 will receive a free boiler.

Ofgem specifically states that ECO4 is not a grant scheme. Energy companies decide which projects they fund and the amount of funding they provide.

This means an offer could involve:

The full cost being covered
Part of the cost being covered
Several energy-efficiency improvements being offered together
A different heating measure being recommended instead of a boiler

If an installer asks you to make a financial contribution, you can compare offers before agreeing to the work.

The phrase “free boiler grant” should therefore not be interpreted as a guarantee that every eligible applicant will receive a new boiler at no cost.

Can a Boiler Be Replaced Under ECO4?

Yes, boiler repair, replacement or heating-system upgrades can be eligible in certain circumstances.

For example, Ofgem says an efficient boiler that has broken down may potentially be replaced where it cannot be economically repaired.

An inefficient heating system may also potentially qualify for an upgrade. The exact rules depend on factors including the existing heating system, the property, its energy-efficiency rating and the package of improvements being proposed.

This means having an old boiler on its own does not automatically qualify you for a replacement.

A retrofit assessment is normally required to establish what improvements are appropriate for the property.

Read:How to Work Out the True Monthly Cost of Annual Bills

Which Homes Can Qualify for ECO4?

Property energy efficiency is an important part of ECO4 eligibility.

For owner-occupied properties, ECO4 generally focuses on homes starting in SAP/EPC bands D to G.

Private rented properties generally need to start in bands E to G, and there are additional restrictions on the types of heating work that can be funded.

ECO4’s minimum improvement targets generally require:

Homes starting in bands F or G to improve to at least band D
Homes starting in bands D or E to improve to at least band C

This is one reason ECO4 may involve insulation or other measures alongside heating improvements.

Which Benefits Can Qualify for ECO4?

One of the main eligibility routes is the Help to Heat Group.

According to Ofgem, qualifying benefits can include:

Income-based Jobseeker’s Allowance
Income-related Employment and Support Allowance
Income Support
Pension Credit Guarantee Credit
Universal Credit
Housing Benefit
Pension Credit Savings Credit
Child Benefit, subject to applicable household income limits

Certain households receiving qualifying Warm Home Discount support may also meet the Help to Heat criteria.

Receiving a qualifying benefit can establish household eligibility, but the property itself still needs to meet the relevant scheme requirements.

It also does not guarantee that an energy supplier will fund a particular installation.

What If You Do Not Receive Benefits?

Not receiving one of the standard qualifying benefits does not necessarily mean you cannot receive ECO4 assistance.

There is another route called ECO4 Flex.

Participating local authorities and devolved administrations can identify additional low-income or vulnerable households that may qualify.

One ECO4 Flex route can include households with gross annual income below £31,000. Other routes can cover certain households with health conditions that are made worse by living in a cold home, along with other proxy or locally assessed criteria.

Because ECO4 Flex is administered locally, the exact process can depend on where you live and whether your local authority participates.

Can Private Tenants Get a Boiler Through ECO4?

Private tenants may qualify for ECO4, but the rules are more restrictive.

You will generally need your landlord’s consent before measures can be installed.

Ofgem states that boiler repair or replacement is generally not eligible in private rented properties under ECO4, except in particular circumstances such as:

First-time central heating
Renewable heating
District heating connections

Other energy-efficiency improvements may still be available depending on the property and assessment.

If you rent privately, do not assume an advertisement for a free boiler applies to your property. Ask the supplier or installer exactly which ECO4 rules they are relying on.

How to Apply for ECO4 in 2026

There is not one single ECO4 application that guarantees funding.

A practical process is:

1. Check Your Home’s Energy Rating

Find your current Energy Performance Certificate if you have one.

ECO4 primarily targets homes with poorer energy-efficiency ratings.

Do not worry if your certificate is old or unavailable — a formal retrofit assessment may still be carried out as part of the process.

2. Check Your Household Eligibility

Consider whether anyone living in the property receives one of the qualifying benefits.

If not, check whether you might qualify through ECO4 Flex, particularly if your household has a low income or someone has a relevant health vulnerability.

3. Contact an Obligated Energy Supplier

You can contact an energy supplier participating in ECO4.

Importantly, it does not have to be the company currently supplying your gas or electricity.

Ofgem confirms that an obligated supplier can support eligible homes even where the household is a customer of another energy company.

4. Check With Your Local Council for ECO4 Flex

If you think you may qualify through ECO4 Flex, check your council’s website for:

ECO4 Flex

Energy Company Obligation Flexible Eligibility

Participating councils publish eligibility information and can refer qualifying households.

5. Have the Property Assessed

If your application progresses, a retrofit assessment should determine the home’s condition, energy rating and appropriate measures.

You may discover that the recommended package includes insulation or heating controls as well as — or instead of — a replacement boiler.

6. Read the Offer Before Signing

Before work begins, check:

Exactly what is being installed
Whether you must pay anything
Who is carrying out the work
What warranties or guarantees apply
What happens if there is a problem
Whether additional work is included

Ofgem advises consumers to agree to ECO measures only after receiving a contract.

Check That the Installer Is TrustMark Registered

Most ECO work must be carried out by, or under the responsibility of, a TrustMark registered business.

If an installer contacts you, ask for their TrustMark registration details and check them before agreeing to work.

TrustMark is the government-endorsed quality scheme used for ECO installations.

Keep copies of:

Contracts
Survey documents
Installer details
Guarantees
Emails
Payment records
Completion documents

These can be important if a problem develops later.

Be Careful With “Free Boiler” Advertising

Eligibility for ECO4 does not automatically mean:

You are guaranteed funding
You are guaranteed a boiler
The work will always cost £0
Every installer offering ECO4 work is working directly for the government

A genuine provider should be able to explain:

Who is funding the work
Which ECO4 eligibility route applies
What measures are proposed
Whether a contribution is required
Who the installer and retrofit coordinator are

Do not feel pressured into immediately signing a contract.

If you are offered several ECO packages, compare them before deciding.

What If Your Boiler Is Working but Very Old?

An old boiler does not automatically qualify for ECO4 replacement.

Whether heating work is eligible depends on the efficiency and condition of the system, the property’s energy rating and the wider retrofit project.

ECO4 places particular emphasis on improving the overall energy efficiency of the home rather than simply replacing equipment because of age.

For example, insulation may need to be improved before certain heating measures are installed.

What If Your Boiler Has Completely Broken Down?

A broken boiler may qualify in some owner-occupied homes.

However, the assessor will consider whether it can be economically repaired and whether the wider project meets ECO4 requirements.

Do not pay a company an upfront fee simply because it promises that a broken boiler automatically qualifies for a government-funded replacement.

Get confirmation of eligibility and the proposed ECO4 work in writing.

ECO4 Is Closing Soon

This is particularly important in late 2026.

ECO4 was originally due to finish earlier in 2026 but was extended until 31 December 2026.

The extension did not simply create unlimited new funding. Its purpose includes allowing suppliers additional time to complete their obligations and manage closure of the scheme. GOV.UK

If you are reading this close to the end of 2026, contact suppliers or your local authority promptly rather than assuming applications will remain available indefinitely.

What Other Help Is Available?

If ECO4 is not suitable, other programmes may be worth checking.

Warm Homes: Local Grant

In England, the Warm Homes: Local Grant can provide fully funded energy-efficiency improvements to eligible privately owned homes.

Homes generally need an EPC rating of D to G, and household income is usually £36,000 or less, although additional eligibility routes exist.

Possible improvements can include insulation, heat pumps, smart controls and solar panels. GOV.UK

Boiler Upgrade Scheme

Despite its name, the Boiler Upgrade Scheme is mainly designed to help households move away from fossil-fuel heating.

In England and Wales, current grants include up to:

£7,500 towards an air-source heat pump
£7,500 towards a ground-source heat pump
£5,000 towards an eligible biomass boiler
£2,500 towards an air-to-air heat pump

It does not provide a grant simply to replace one ordinary gas boiler with another gas boiler.

Read:How to Organise Household Bills: A Practical UK Checklist

Scotland

Households in Scotland can check Home Energy Scotland for advice on current energy-efficiency funding and support.

Wales

Households in Wales can also check the Nest scheme for advice and potential home energy improvements.

Northern Ireland

ECO4 covers Great Britain rather than Northern Ireland.

Northern Ireland has separate programmes. For 2026/27, the Northern Ireland Sustainable Energy Programme includes schemes supporting heating and insulation improvements, particularly for vulnerable households. Utility Regulator

Frequently Asked Questions

Is there really a free boiler grant in the UK in 2026?

There is no universal government scheme guaranteeing everyone a free boiler. ECO4 can fund eligible heating improvements and some households may receive fully funded work, but ECO4 is technically an energy-company obligation rather than a direct grant.

When does ECO4 end?

ECO4 is currently scheduled to end on 31 December 2026.

Do I have to be on benefits?

Not always. Benefits are one main eligibility route, but households may also qualify through ECO4 Flex.

Can pensioners get ECO4 support?

Potentially. Eligibility depends on factors such as qualifying benefits, household circumstances and property eligibility rather than age alone.

Can I apply if I rent?

Private tenants may qualify for some ECO4 measures but generally need landlord permission, and boiler replacement rules are more restrictive for rented homes.

Do I need to use my own energy supplier?

No. Ofgem confirms that support may be delivered by another obligated supplier even if you remain with your existing energy company.

Does qualifying guarantee a new boiler?

No. Eligibility does not guarantee that a supplier will fund a project or that the recommended measure will be a boiler replacement.

Final Checklist Before Applying

Before contacting an ECO4 provider:

Check your EPC if available
Check whether anyone receives a qualifying benefit
Check ECO4 Flex through your local authority if necessary
Gather evidence of household income or benefits if requested
Contact an obligated energy supplier
Arrange a proper property assessment
Verify the installer through TrustMark
Get the full offer and any contribution in writing
Check guarantees before installation
Do not assume “free boiler” means guaranteed free work

For eligible households, ECO4 can provide valuable help with heating and energy-efficiency improvements.

But the key is to treat “free boiler grant” as a common description rather than a guarantee. Check your eligibility, verify the company you are dealing with and make sure you understand exactly what is being offered before agreeing to any work.

Optional UK Home Saver tool

While you are reviewing heating and energy costs, the UK Home Saver Household Bills Command Centre 2026 can help you keep energy bills, recurring household costs, subscriptions, spending and savings together in one workbook.

View the Household Bills Command Centre 2026 on Gumroad

Also available from the UKHomeSaver Etsy shop.

This digital product is optional and is not connected with ECO4, Ofgem, the UK Government or any energy supplier.