Boiler Grants

Boiler Grants in the UK with ECO4

At ECO4, we are committed to helping homeowners and tenants across the UK access funding for upgrading outdated heating systems through Boiler Grants. As part of the UK Government’s ECO4 scheme, these grants aim to replace inefficient gas boilers and central heating systems with modern, energy-efficient alternatives. The ECO4 initiative, along with the Great Britain Insulation Scheme (GBIS) and Local Authority FLEX mechanism, provides essential financial support to reduce heating costs, improve energy efficiency, and combat fuel poverty.

Whether you have a non-condensing gas boiler, old electric storage heaters, or other outdated heating systems, ECO4 boiler grants can help transform your home into a warmer, more energy-efficient space while reducing your carbon footprint.

What is the ECO4 Scheme?

The ECO4 scheme is a government initiative designed to tackle fuel poverty, lower carbon emissions, and improve the energy efficiency of homes. Under this scheme, households can access funding for upgrading their heating systems, including the installation of modern, energy-efficient boilers and other heating measures.

If your existing boiler is inefficient or you rely on outdated systems like back boilers or electric storage heaters, you may qualify for a grant to install a new combi condensing gas boiler and central heating system, including pipework, radiators, and smart controls. These upgrades are fully funded for eligible households, reducing upfront costs and enabling long-term energy savings.

What is the GBIS Scheme?

The Great Britain Insulation Scheme (GBIS) focuses on improving the energy efficiency of homes with lower Energy Performance Certificate (EPC) ratings (D to G). This initiative complements ECO4 by providing funding for households in England, Scotland, and Wales, especially those in council tax bands A to D in England or A to E in Scotland and Wales.

If your property has an inefficient boiler and falls within these criteria, GBIS funding can help replace your existing heating system with a modern boiler, ensuring your home becomes more energy-efficient while lowering your energy bills.

What is the FLEX Route?

The Local Authority FLEX mechanism provides additional eligibility criteria for households that may not qualify under ECO4 or GBIS. FLEX is specifically designed to assist low-income households, those in fuel poverty, or individuals vulnerable to the effects of living in a cold home.

Under the FLEX route, you may qualify for a boiler grant through one of the following pathways:

FLEX Route 1 – Household Income
Households with a gross annual income of less than £31,000 may qualify under this route.
FLEX Route 2 – Proxy Targeting
Households meeting certain vulnerability indicators, such as living in a deprived area or receiving council tax reductions, may qualify.
FLEX Route 3 – NHS Referrals
Households with a member suffering from health conditions worsened by cold conditions may be referred by a healthcare professional.
FLEX Route 4 – Bespoke Targeting
Local Authorities can identify households in need of boiler upgrades based on local circumstances.

Benefits of a New Boiler

Upgrading to an energy-efficient boiler offers numerous benefits, including:

Lower Energy Bills

Modern boilers use energy more efficiently, reducing the amount of gas required to heat your home and lowering your energy bills.

Improved Home Comfort

A new boiler ensures your home stays warm throughout the winter, maintaining a consistent and comfortable temperature.

Reduced Carbon Emissions

Energy-efficient boilers use less fuel, helping to lower your household’s carbon footprint and support the UK’s net-zero goals.

Smart Heating Controls

Many new boilers come with smart controls, allowing you to manage your heating system more efficiently and further reduce energy consumption.

Enhanced Property Value

An upgraded boiler can increase your home’s value by improving its EPC rating, making it more attractive to potential buyers.

What Makes a Boiler Eligible for Replacement?

Not all boilers qualify for replacement under the ECO4 scheme, as eligibility depends on specific criteria. The main aim is to replace outdated or inefficient heating systems with modern, energy-efficient alternatives. Below are the key factors that determine whether your boiler may be eligible for replacement under a boiler grant:

  1. Boiler Age
    Older boilers, typically over 10-15 years old, are more likely to qualify. These systems often lack the energy efficiency of modern condensing boilers and may contribute to higher energy bills.
  2. Boiler Type
    Certain types of boilers are prioritised under the scheme, including:
    • Non-condensing gas boilers
    • Back boilers (often installed behind fireplaces)
    • Electric storage heaters with poor efficiency ratings
  3. Boiler Efficiency
    Boilers with a low energy efficiency rating, such as G-rated boilers, are typically eligible for replacement as they consume significantly more fuel compared to newer models.
  4. System Performance
    Faulty or unreliable boilers that frequently break down or cannot provide adequate heating may also qualify for replacement under the scheme.
  5. Energy Performance Certificate (EPC) Rating
    Properties with an EPC rating of D, E, F, or G are given priority. If your home has a low energy efficiency rating, you are more likely to receive funding for a boiler replacement.
  6. Household Income or Benefits
    Households receiving certain government benefits or meeting low-income criteria may qualify for grants to replace their inefficient heating systems. Check specific eligibility under ECO4, GBIS, or FLEX schemes.


If you are unsure whether your boiler qualifies, an energy assessment by a certified surveyor can confirm eligibility upon application. This ensures that the replacement aligns with the scheme’s goals to improve energy efficiency and reduce carbon emissions.

Am I Eligible for a Boiler Grant?

Eligibility for a boiler grant under the ECO4 or GBIS scheme depends on a variety of factors, including your income, benefits received, and the current state of your heating system. You may qualify if:

  • You receive certain benefits such as Universal Credit, Income Support, Pension Credit, or Child Benefit (subject to income thresholds).
  • Your home has a low EPC rating (D to G).
  • You are considered fuel poor or vulnerable under the FLEX scheme.

Our team will assess your eligibility during the application process, ensuring you receive the maximum support available.

The Cost of a New Boiler Without a Grant

Replacing a boiler without financial assistance can be a significant expense, making boiler grants an attractive option for eligible households. The cost of a new boiler depends on several factors, including the type of boiler, the size of your home, and installation complexity. Here’s a general breakdown:

  1. Boiler Prices
    A new combi boiler typically costs between £1,500 and £2,500.
    System boilers, which are more suitable for larger homes, can cost between £2,000 and £3,500.
  2. Installation Costs
    Installation fees vary depending on the complexity of the job, with costs ranging from £500 to £1,500. Factors influencing installation costs include: The need for additional pipework or radiators. Removal of the old boiler and system adjustments. Upgrading to smart heating controls
  3. Additional Costs
    Power flushing the heating system: £300 to £500. Adding a smart thermostat: £150 to £300. Replacing outdated radiators: £200 to £300 per radiator. 


Total Costs

For a straightforward installation, the total cost of a new boiler can range between £2,000 and £4,500, but more complex setups can exceed £5,000. These costs can be prohibitive for low-income households, making government boiler grants and schemes like ECO4 vital for ensuring access to modern heating solutions.

The Process for Applying for a Boiler Grant

Applying for a boiler grant with ECO4 is a simple and straightforward process. 

Before the process begins, it’s worth noting that in addition to a new boiler, the ECO4 scheme may also support a range of energy efficiency improvements, such as cavity wall insulation, loft insulation, solid wall insulation, roof insulation, and air source heat pumps. These energy efficiency measures are designed to make your home warmer and more affordable to heat.

Here’s what to expect:

  1. Complete the Online Application Form
    Start by filling out our quick and easy online application form. This collects essential information about your household, current heating system, and eligibility for support under the scheme.
  2. Contact from Our Team
    Once we receive your application, one of our team members will contact you to confirm your details and explain the next steps.
  3. Home Assessment
    An accredited surveyor will visit your property to assess your current heating system and determine the best boiler upgrade for your home.
  4. Discuss Your Options
    Based on the assessment, we’ll discuss the grant options available to you, including other energy-saving measures you may qualify for under ECO4.
  5. Installation of Your New Boiler
    Once your grant is approved, our certified installers will replace your old boiler with a modern, energy-efficient model, ensuring your home is ready for the colder months.

Apply Now for a Boiler Grant

If you think you might be eligible for a boiler grant under the ECO4, GBIS, or FLEX scheme, now is the perfect time to take action. At ECO4, we’re here to guide you through the application process, ensuring you can enjoy the benefits of a modern, energy-efficient boiler.

To apply for a boiler grant, simply complete our online application form or get in touch with our team for more information. Together, we can help make your home warmer, more efficient, and less costly to heat.

Boiler Grants FAQs

Can landlords apply for a boiler grant on behalf of their tenants?

Yes, private landlords can apply for the scheme to upgrade their rental properties, provided the tenant living in the home meets the ECO4 eligibility criteria. The tenant must be claiming qualifying benefits or meet the low income threshold. Upgrading the boiler will help you improve the property’s Energy Performance Certificate (EPC) rating, making it compliant with future rental regulations while lowering your tenant’s energy bills.

You may still qualify for a boiler grant even if you do not receive traditional government benefits. Through the Local Authority FLEX (LA Flex) scheme, local councils can approve households based on a combined annual income of less than £31,000 or specific health conditions made worse by living in a cold home. Our team can quickly assess your situation to see if you qualify through this alternative route.

For the majority of eligible households, the boiler replacement is 100% fully funded under the ECO4 scheme with no upfront costs. Occasionally, if a property requires complex structural adjustments, extensive new pipework, or radiator upgrades to meet current safety regulations, a small financial contribution might be required. We will conduct a free property survey to confirm all details and ensure complete financial transparency before any work begins.

The entire process, from your initial online application to enjoying a warm home, typically takes between two and four weeks. Once you submit your details, our team immediately verifies your eligibility and arranges a home assessment. After the funding is officially approved, we will work with you to schedule an installation date that fits perfectly into your routine.

Absolutely. Every new boiler installed through the ECO4 grant scheme includes a standard manufacturer warranty. This generally covers parts and labour for two to five years, providing you with long term peace of mind. On the day of installation, our certified engineers will register the warranty for you and demonstrate exactly how to use your new, energy-efficient heating system.