Free Boiler Grants and Schemes in the UK: Who Qualifies (2026 Guide)

What Are Free Boiler Schemes and How Do They Work?

Free boiler schemes in the UK are government-backed programmes that fund the replacement of old, inefficient boilers in eligible households. The money does not come directly from HMRC or a government department — instead, large energy suppliers such as British Gas, EDF, E.ON, OVO, Scottish Power, and Octopus Energy are legally required to fund these upgrades as part of their licence obligations.

Because the grants are non-repayable, you never have to pay the money back. If you qualify, an approved installer will assess your home, supply the new boiler, and carry out the full installation — all at zero upfront cost to you. The key is meeting the eligibility criteria, which centre on the benefits you receive, your property's energy rating, and the condition of your current heating system.

The Three Main UK Boiler Grant Schemes in 2025/26

There are three key schemes relevant to free or subsidised boilers right now.

• ECO4 (Energy Company Obligation 4) — the primary free grant scheme for low-income and fuel-poor households, running until 31 December 2026 after receiving a nine-month extension beyond its original March 2026 end date.
• The Boiler Upgrade Scheme (BUS) — a universal grant that helps any homeowner in England or Wales install a low-carbon heating system such as an air source heat pump. It is not means tested and runs until the end of December 2027, with further funding allocated to 2029/30 under the Warm Homes Plan.
• The Warm Homes Plan — the government's long-term strategy for home energy efficiency, backed by approximately £15 billion and launching in January 2027. After ECO4 closes, the main free route for low-income households will be through the Warm Homes Local Grant, delivered via local councils.

Each scheme has different eligibility rules, so it is worth understanding which one applies to your situation before you apply.

ECO4 Boiler Grant: Full Eligibility Criteria

ECO4 is the scheme most people are referring to when they search for a free boiler grant. It targets households in fuel poverty or on low incomes, and takes a whole-of-house approach — meaning you may receive not just a new boiler but also insulation, heating controls, and other improvements.

To qualify, you generally need to meet all of the following conditions:

• You must be a homeowner or a private or social housing tenant (landlords can apply with tenant consent).
• Your home must have an Energy Performance Certificate (EPC) rating of D, E, F, or G. Homes already rated A, B, or C are not eligible.
• Your existing boiler should be at least eight years old and connected to the mains gas supply. Off-grid properties using LPG, oil, or biomass do not qualify for a gas boiler replacement, though they may qualify for an air source heat pump instead.
• Your current boiler should be a non-condensing model. Most boilers installed before 1 April 2005 are non-condensing.
• You (or someone in your household) must receive at least one qualifying benefit.

The main qualifying benefits are: Universal Credit, Income Support, Income-based Jobseeker's Allowance (JSA), Income-related Employment and Support Allowance (ESA), Working Tax Credit, Child Tax Credit, Housing Benefit, Pension Guarantee Credit, and Pension Savings Credit.

If you have previously received a free boiler grant under an earlier ECO phase, you cannot claim again under ECO4.

What If You Don't Receive Benefits? The LA Flex Route

Not receiving any qualifying benefits does not automatically rule you out. Local Authority Flexible Eligibility — known as LA Flex — allows your local council to refer households that fall outside the standard criteria but are still considered fuel poor or vulnerable.

Under the income pathway, households with a gross annual income of less than £31,000 may qualify. Councils can also refer people based on health conditions that are made worse by living in a cold home, even if their income is slightly above that threshold.

To explore this route, contact your local council directly and ask whether they participate in ECO4 LA Flex referrals. Some councils are very active in this area; others less so. It is always worth asking, especially if you have a long-term health condition or are caring for young children or elderly relatives in the home.

What Does a Free ECO4 Grant Actually Cover?

The scope of what is funded depends on your individual survey, but an ECO4 grant can cover:

• A new A-rated condensing combi boiler (the most common replacement), including all associated pipework, fittings, and commissioning.
• Central heating controls such as a smart thermostat and thermostatic radiator valves.
• In some cases, a full first-time central heating system including radiators.
• Roof and cavity wall insulation as part of the whole-of-house approach.
• If your home is off the gas grid, a free air source heat pump and solar panels may be funded instead.

All installations under ECO4 must be carried out by Gas Safe registered engineers who also hold PAS 2035 approval — the quality standard for retrofit work. You should always ask to see proof of Gas Safe registration before any work begins.

Combi Boiler Grants: Why Combis Are the Standard Replacement

Combi boilers are by far the most common replacement issued under free boiler schemes. A combi (combination) boiler provides both central heating and hot water on demand from a single unit, without the need for a separate hot water cylinder or cold water tank in the loft. This makes them ideal for most UK homes, particularly smaller properties and flats.

The efficiency gain from replacing an old non-condensing boiler with a new A-rated combi is significant. Non-condensing boilers typically operate at around 75% efficiency — meaning roughly a quarter of the energy you pay for is wasted up the flue. A modern A-rated condensing boiler achieves approximately 92–95% efficiency. For the average home, this kind of upgrade can cut a few hundred pounds a year off heating bills, depending on the size of the home and how it is heated.

Under ECO4, only certified installers and approved boiler models are permitted. From application to installation, the typical timeline is two to six weeks, depending on survey availability and local demand. All new gas boilers installed from January 2025 must also be hydrogen-ready, meaning they can run on a blend of up to 20% hydrogen — future-proofing your heating system as the UK moves toward Net Zero by 2050.

The Boiler Upgrade Scheme: Low-Carbon Heating for Everyone

The Boiler Upgrade Scheme (BUS) is different from ECO4 in one important way: it is open to any homeowner in England or Wales, regardless of income. It is not a free boiler scheme in the traditional sense — it does not replace your gas boiler like-for-like. Instead, it provides a grant to reduce the upfront cost of switching to a low-carbon heating system.

The grant available is £7,500 toward an air source heat pump. Since 21 July 2026, homeowners currently heating with oil or LPG have been able to access an increased grant of £9,000. Biomass boilers are also eligible in certain rural properties.

Importantly, hybrid heating systems — which pair an air source heat pump with an existing gas boiler — are not currently eligible for the BUS. The scheme only supports fully electric heat pump or biomass installations.

The BUS is applied for by your installer, not directly by you. You simply receive a reduction off the installation invoice. The scheme runs until at least the end of December 2027.

The Warm Homes Plan: What Comes Next

The Warm Homes Plan, published in January 2026, is the UK government's overarching strategy to improve the energy efficiency of homes across the country. With just under £15 billion in capital investment, it is described as the largest energy efficiency programme in British history.

For low-income households, the most relevant part will be the Warm Homes Local Grant, delivered through local councils from January 2027. This will effectively replace ECO4 as the primary free heating upgrade route once ECO4 closes on 31 December 2026.

If you are eligible for ECO4 but have not yet applied, the BOYLA Team strongly recommends doing so before the December 2026 deadline rather than waiting for the new scheme to launch.

Typical UK Boiler Costs If You Don't Qualify for a Grant

If you do not meet the eligibility criteria for any free scheme, you will need to fund a replacement boiler yourself. Here are the typical costs across the UK at the time of writing. Prices vary by region — expect the top end (or 20–30% more) in London and the South East, and generally lower prices in the North and Scotland.

A like-for-like combi boiler replacement (same location, no system changes) is typically the cheapest scenario. Costs rise considerably if you are switching boiler type, moving the boiler to a different location, or upgrading from a back boiler. Most new boilers come with manufacturer warranties of seven to twelve years, and the system should last fifteen to twenty years with annual servicing.

Additional costs to budget for include a smart thermostat (typically £150–£300 fitted), relocating the boiler (£500–£1,000 in additional pipework and labour), new radiators, and a magnetic system filter to protect the heat exchanger.

What Affects the Price of a New Boiler?

Several factors push the cost of a new boiler up or down:

• Boiler output and brand — higher-output models for larger homes cost more, and premium brands carry a price premium over budget models. Both can be reliable; the key is correct sizing for your property.
• Location of the boiler — moving the boiler from one wall to another, or relocating it from the kitchen to a utility room, requires additional pipework and flue work and adds significantly to the bill.
• Type of system — switching from a regular (heat-only) boiler with a cylinder to a combi involves removing the cylinder, capping off the cold water tank, and re-routing pipework. This is more work than a straight like-for-like swap.
• Property size — a larger home needs more radiators, longer pipe runs, and a higher-output boiler.
• Flue requirements — if your existing flue route cannot be reused, a new route must be cut and sealed, adding cost.
• Region — labour rates vary considerably across the UK.

How to Avoid Overpaying for a New Boiler

Getting multiple quotes is the single most effective way to avoid overpaying. Aim for at least three written quotes before committing. Here is what to look for:

• Always verify that any engineer is Gas Safe registered. You can check this for free on the official Gas Safe Register website by entering their registration number or name.
• Ask for itemised quotes that separate the boiler unit cost, labour, materials, and any optional extras. This makes it much easier to compare fairly.
• Check that the quoted boiler model and output (in kW) is appropriate for your home — an undersized boiler will struggle in cold UK winters, while an oversized one is wasteful.
• Look for quotes that include commissioning, Building Regulations notification (usually via a Competent Person Scheme), and the manufacturer warranty registration.
• Be cautious of quotes that are significantly lower than others — they may exclude VAT, exclude commissioning, or plan to use a reconditioned boiler rather than a brand-new one.

Red Flags to Watch Out For in Boiler Quotes and Grant Claims

Unfortunately, the free boiler grant sector attracts some unscrupulous traders. Watch out for the following warning signs:

• Cold callers or door-knockers claiming you are 'definitely eligible' before they have checked your benefits, EPC rating, or boiler age. Eligibility can only be confirmed after a proper survey.
• Requests for an upfront payment before any work begins. Legitimate ECO4 installations are free — you should not pay anything.
• Companies that cannot provide proof of Gas Safe registration for their installers.
• Pressure to sign paperwork immediately or 'before the scheme runs out'. Genuine schemes have published end dates and do not require same-day decisions.
• Offers of cash-back or referral fees that seem unusually generous.
• Any trader who offers to install a second-hand or reconditioned boiler under a grant scheme — all ECO4 replacements must use new, approved units.

If you are unsure about a company, check whether they are registered with a trade body such as OFTEC, CORGI HomePlan, or the Heating and Hotwater Industry Council (HHIC). You can also report suspected fraud to Citizens Advice or your local Trading Standards office.

Step by step

1. Check your benefits and income

   Look at the list of qualifying benefits above. If you or anyone in your household receives one of these, you are likely on the benefits pathway. If not, check whether your gross household income is below £31,000, which may make you eligible via the LA Flex route.

2. Check your EPC rating

   Your home needs an EPC rating of D, E, F, or G to qualify for ECO4. You can look up your current EPC for free on the government's EPC register at www.gov.uk. If your home does not have a current EPC, an assessor can produce one for around £60–£120.

3. Check your boiler age and type

   Your boiler should ideally be at least eight years old and a non-condensing model. If you are unsure, look for the installation date on the boiler casing or check your service records. Boilers installed before April 2005 are almost certainly non-condensing.

4. Contact an ECO4 approved installer or your energy supplier

   You can apply directly through an ECO4 approved installer (search for local companies accredited under PAS 2035) or contact your current energy supplier, as they are legally obligated to fund a proportion of ECO4 upgrades. Some councils also have their own referral portals.

5. Have a free home survey carried out

   A surveyor will visit your home to confirm eligibility, assess your property's energy efficiency, and determine what improvements are needed. This survey is free and carries no obligation.

6. Installation by a Gas Safe registered engineer

   If approved, your new boiler and any associated upgrades will be installed by a Gas Safe registered and PAS 2035-approved engineer at no cost to you. The process typically takes two to six weeks from application to installation. Make sure you receive all commissioning documents and warranty paperwork on the day.

Typical costs

Typical UK ranges as a guide only — prices vary by region (expect the top end, or 20–30% more, in London and the South East) and by how accessible your system is. Always get a written quote.

Frequently asked questions