A failing gas boiler can force a quick decision, but replacing it like-for-like may not be your only option. This Boiler Upgrade Scheme eligibility guide explains whether the current government grant could help you move to an air source heat pump, reduce your reliance on fossil fuel heating and make your home more comfortable.
The Boiler Upgrade Scheme, often called BUS, can provide a grant of up to £7,500 towards an eligible air source or ground source heat pump installation in England and Wales. It is not an income-tested benefit, so eligibility is mainly about your property, its current heating and the standard of the proposed installation.
The grant can make a heat pump far more affordable, but it does not automatically mean a free installation. Every home needs a proper assessment first. The final cost depends on the size of the system, insulation levels, radiator upgrades, pipework and any electrical work required.
Boiler Upgrade Scheme eligibility guide: the main rules
You may be eligible if you own the property in England or Wales and are replacing an existing fossil fuel heating system with a qualifying low-carbon alternative. Owner-occupiers, private landlords and some self-build homeowners can apply. The scheme is designed for homes and small non-domestic properties, rather than large commercial buildings.
In practical terms, you will normally need to meet the following requirements:
- You own the property being upgraded. Private landlords can apply for eligible rental properties, but tenants cannot apply themselves.
- The property has a valid Energy Performance Certificate (EPC), generally issued within the past 10 years.
- There must be no outstanding EPC recommendations for cavity wall insulation or loft insulation, unless an accepted exemption applies.
- An MCS-certified installer must design and fit the heat pump, then apply for the grant on your behalf.
- The new system must meet the scheme’s technical and installation standards.
Most existing homes are within scope. New-build homes are usually excluded, although self-build properties may qualify where the relevant conditions are met. Social housing is also generally outside the scheme.
The scheme is available in England and Wales, not Scotland or Northern Ireland, which have different support arrangements.
Your existing boiler and heating system
The grant is intended to support a move away from fossil fuel heating, such as gas, oil or LPG boilers. If your home already has a heat pump or another low-carbon heating system, you are unlikely to be able to use BUS simply to replace or add to it.
Homes heated solely by direct electric systems need particular care. Eligibility can depend on the existing setup and the proposed work, so avoid assuming that an electric heater replacement will qualify. A qualified installer can check the position before you commit to a design.
The EPC rule: often the first thing to check
For many households, the EPC is the deciding factor. It does not need to show a particular EPC rating to access the Boiler Upgrade Scheme. A lower-rated home can still qualify. What matters is whether the certificate shows outstanding recommendations for loft insulation or cavity wall insulation.
This rule exists for a good reason. Heat pumps work best when heat stays inside the building. Insulation reduces heat loss, helping the system maintain a steady indoor temperature with less energy.
However, an EPC recommendation is not always practical to complete. Some walls cannot be safely filled, a property may have no cavity, or access may be restricted. In these situations, an exemption may be possible where suitable evidence is available. This must be checked properly rather than overlooked.
An old EPC may also fail to reflect improvements you have already made. If you have insulated the loft, improved the walls or installed better glazing since the certificate was issued, a new EPC could give a more accurate picture of your home.
What the £7,500 grant covers
The £7,500 grant is deducted from the cost of an eligible air source heat pump or ground source heat pump installation. You do not normally receive the money directly. Your installer applies through the scheme administrator and shows the deduction in your quotation and final paperwork.
It can cover a substantial part of the work, but a heat pump installation is not a fixed-price product. A compact, well-insulated home with suitable existing radiators may need less work than a larger, older property with undersized emitters and significant heat loss.
A clear quotation should explain what is included beyond the grant. That may include the heat pump, hot water cylinder, controls, radiator changes, electrical upgrades, commissioning and handover. Ask about any work that is excluded, too. Transparent pricing makes it easier to compare options fairly.
The grant cannot usually be combined with another public grant for the same heating installation. Other measures, such as solar panels, battery storage or insulation, may still be considered as part of a wider home energy plan, but their funding and requirements are separate.
Heat pump eligibility is only the starting point
Qualifying for the grant is good news, but it does not prove that every heat pump design will suit your home. The right system starts with a room-by-room heat-loss calculation, not a guess based on the size of your old boiler.
A heat pump runs most efficiently at lower flow temperatures than a traditional boiler. That can mean some radiators need to be larger, or that your existing radiators are already adequate once the home is assessed. A new hot water cylinder is also commonly required because heat pumps heat water more gradually than a combi boiler.
Noise, outdoor unit location and condensate drainage should be planned early. The unit needs suitable airflow and clearances, while the pipe route and internal equipment need to work for your layout. Most homes can accommodate an air source heat pump, but the best location is not always the nearest available wall.
This is why a survey matters. It identifies the installation work needed for reliable performance and avoids a quote that looks attractive at first but misses essential upgrades.
A straightforward route from eligibility to installation
Start by checking whether you have a current EPC and reading the recommendations carefully. If loft or cavity wall insulation is listed as outstanding, deal with that question before assuming the application can proceed. A reputable installer can help you understand whether the work is required or whether an exemption may apply.
Next, arrange a home assessment. The installer should look at insulation, room sizes, radiator output, your hot water demand, the existing heating system and the proposed outdoor unit position. You should receive a tailored recommendation rather than a one-size-fits-all heat pump.
If the property and proposal are eligible, the installer applies for the BUS voucher before installation begins. Do not arrange work on the assumption that the grant can be added afterwards. The process and timing matter, and an installer should be clear about what happens if any eligibility issue arises.
Once the work is complete, commissioning is more than a formality. The system should be tested, controls explained and paperwork provided. You should know how to set heating schedules, adjust temperatures and get support after installation.
Questions homeowners and landlords often ask
Do I need to be on a low income?
No. The Boiler Upgrade Scheme is not means-tested. It is based on the property and installation meeting the rules, not on household income. Finance may be available for the remaining installation cost, subject to the provider’s terms and eligibility.
Can landlords use the grant?
Yes, private landlords can usually apply for eligible properties they own. The property still needs to meet EPC and installation requirements. A heat pump can be a practical way to improve comfort for tenants while modernising a rental home’s heating system.
Will a heat pump lower my energy bills?
It depends on your current fuel, energy tariff, insulation and how the system is designed and used. A well-designed heat pump can be highly efficient, but the best results come from combining the right equipment with good insulation, sensible controls and suitable radiators. The grant reduces upfront cost, while running-cost savings should be discussed honestly during the survey.
Is planning permission needed?
Many air source heat pump installations can be completed under permitted development rules, but there are exceptions. Listed buildings, conservation areas, flats and unusual sites may need additional checks. Your installer should consider this before confirming the installation plan.
Get a clear answer before replacing your boiler
The best time to check eligibility is before your old boiler becomes an emergency replacement. Sunny Side Pro can assess your home, explain the likely grant position and provide a tailored heat pump recommendation with transparent costs. A properly planned upgrade can turn an unavoidable boiler decision into a long-term improvement in comfort, efficiency and cleaner heating.