What's the Boiler Upgrade Scheme?

All the information you need to know about the Boiler Upgrade scheme including who is eligible, what’s included and how you can apply.

UK households can upgrade their old, inefficient boilers to modern, energy-efficient models through the Boiler Upgrade Scheme (BUS). Eligible households can receive financial assistance under the scheme, which helps them reduce their energy bills and reduce their carbon footprint.

A Boiler Upgrade Scheme might be a great option if you’re thinking about upgrading your boiler. Through this scheme, you can receive a grant towards the cost of your new boiler, making the switch more affordable. There are several factors that determine the amount of the grant, including the boiler’s efficiency and the type of property you own.

By upgrading your boiler, you can save money on your energy bills, since newer boilers are generally more efficient than older ones. They can also be more reliable, quieter, and easier to operate. As a bonus, you’ll also be helping reduce carbon emissions and the impact of climate change by upgrading your boiler.

Interested in upgrading your boiler? Check if you qualify for a grant under the Boiler Upgrade Scheme. If you meet certain criteria, such as having an old, inefficient boiler, being a homeowner, and living in an eligible area, you may qualify for the program. 

Applicants can apply for the scheme and receive a grant towards the cost of new boiler installation if they are eligible.

What you can find on this page

Who is eligible for the Boiler Upgrade Scheme?

The criteria for the Boiler Upgrade Scheme scheme are set by central UK Government.

This is a means tested scheme, aimed at targeting the most vulnerable households in the UK with the least energy efficient properties.

Initially the scheme was only available for homes without mains gas, however the scheme has now been extended.

How you heat your home: the main aspect of the ECO4 scheme is for homes without a mains gas supply. This is generally off-grid properties in rural areas across the UK, or homes which have never been connected to the grid so do not have a mains gas connection.

Your personal circumstances: in order to be eligible for the main aspect of the scheme, you or somebody living in the property must be in receipt of a means tested benefit (Pension Credit, Universal Credit, Income based Jobseekers allowance, Income related Employment & Support Allowance, Income Support, Housing Benefit, Child Tax Credits or Working Tax Credit. Depending on household income, those in receipt of Child Benefit can also qualify for the scheme.) If you or anybody living in your home don’t receive one of the eligible benefits, you could still be eligible for support as part of the ECO4 FLEX. This is approved at different stages by local authorities.

Additional support: if you have a mains gas supply to your home, you could still be eligible for support. Properties with a non-condensing boiler could qualify for a new combi-boiler as part of the scheme. Often, boilers over 10 years old can be non-condensing as they are no longer manufactured do to their poor efficiency.

Family looking at energy bills

What's included as part of the Boiler Upgrade Scheme?

The Boiler Upgrade Scheme is available for homes in the UK that are upgrading from fossil fuel heating (oil, gas, electric) to a renewable energy heating system. 

The benefit is in the form of a voucher towards the cost of the supply and installation of the heating system.

  • £5,000 towards an air source heat pump
  • £6,000 towards a ground source heat pump (including water source heat pumps and those on shared ground loops)
  • £5,000 towards a biomass boiler


It is important that you ensure your new heating system meets the requirements of the scheme in order to be eligible for the voucher. 

Hybrid Air source heat pump

Air Source Heat Pumps & Ground Source Heat Pumps

Air Source Heat Pumps extract warmth from the outside air and the system uses a chemical reaction to convert this warm air into a gas and the exchanger converts this to heat your radiators and water.

Typical price for an Air Source Heat Pump £10,000
Cost after BUS voucher £5,000

Ground Source Heat Pumps work similarly to an air source heat pump. However, as opposed to extracting warmth from the air, they extract warmth from the ground. This means that there is extensive pipework in your garden and the thermal transfer fluid in the pipes is warmed by the ground.

Typical price for a Ground Source Heat Pump £15,000
Cost after BUS voucher £9,000

A Ground Source Heat Pump tends to be more efficient over time, but the extra savings will vary based on the weather and where you live. The additional costs and extensive installation disruption associated with Ground Source Heat Pumps can generally steer people towards air source.

Potential annual savings switching to a standard air source heat pump in an average sized, three-bedroom semi-detached home. Source Energy Saving Trust.

How do biomass boilers work?

Biomass boilers use organic materials to produce heat, such as wood pellets and chips. Combustion chambers burn fuel, transferring heat to heat exchangers via combustion chambers. The heat exchanger then heats the water, which can be used for both space heating and hot water.

As trees grow, they absorb carbon dioxide released by burning biomass fuel, balancing the emissions. This makes biomass fuel a carbon neutral fuel.

It is possible to source biomass fuel locally, which reduces reliance on imported fossil fuels and promotes local economies. Biomass boilers can also be used to provide heat to buildings not connected to the gas grid or in areas without power.

Generally, biomass boilers increase energy efficiency, reduce carbon emissions, and contribute to local economies while providing a renewable and sustainable heating option.

Typical price for a Biomass Boiler £10,000
Cost after BUS voucher £5,000

Potential annual savings switching to a biomass in an average sized, three-bedroom semi-detached home. Source Energy Saving Trust.

Check if you qualify for the Boiler Upgrade Scheme

Interested to see whether you are eligible for the Boiler Upgrade Scheme? Our Energy Advice Helpline grant checker is below. Just click your answers below to see if you are eligible for any current UK energy grant schemes. 

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