Boiler Upgrade Scheme Changes in 2026: What the Expanded Heat Pump Grants Mean for Homeowners

What has changed?

The 2026 amendment changes the legal framework behind the Boiler Upgrade Scheme in England and Wales. Its central purpose is to widen access to low-carbon heating support and improve how grants are administered.

The regulations expand and clarify the eligible technology categories. Air-to-water and ground-source heat pumps remain central to the scheme, but the framework now also accommodates air-to-air systems and revises provisions relating to biomass boilers. Grant schedules and administrative requirements have also been updated, including obligations around installer certification, evidence and reporting.

That last point is important. This is not simply a discount offered at the till. Boiler Upgrade Scheme funding is tied to an eligible installation delivered through the required process. The installer generally applies for the grant on the homeowner’s behalf, and the value is deducted from the amount the customer pays. Technology eligibility, property eligibility, certification and commissioning evidence must all line up.

Because grant categories and implementation dates can change, homeowners should use the live scheme guidance and formal quotation applicable when an installation is commissioned. An old online article or quotation may not reflect the amended rules.

Why the addition of air-to-air heat pumps is significant

Most heat pumps discussed in the UK are air-to-water models. These take heat from the outside air and transfer it into water circulating through radiators or underfloor heating. They can also heat a domestic hot-water cylinder.

An air-to-air heat pump works differently. It transfers heat into indoor air and distributes that air through one or more fan units. Many systems can reverse their refrigeration cycle and provide cooling during warm weather. They are common internationally but have historically occupied a less obvious place within UK domestic heating policy.

Including air-to-air technology could benefit some properties without a wet central-heating system, as well as smaller homes, flats, park homes and buildings where installing new pipework and radiators would be disruptive. It may also be useful in highly insulated properties with relatively modest heat demand.

There is an important limitation: a typical air-to-air heat pump does not produce domestic hot water. The property therefore needs a separate solution for showers, baths and taps, such as a hot-water cylinder with an immersion heater, a dedicated heat-pump water heater or another compliant arrangement. Cooling may be useful, but it should not distract from designing a complete year-round heating and hot-water system.

How heat pumps work in plain English

A heat pump does not create heat by burning fuel. It moves existing heat from outside the building to the inside using a refrigerant circuit, compressor and heat exchangers. Electricity powers the process.

The relationship between electricity consumed and heat delivered is expressed as a coefficient of performance. If a system delivers three units of heat for every unit of electricity used, its coefficient of performance at that moment is 3. Real-world performance varies with outdoor temperature, heating-water temperature, controls and installation quality.

Heat pumps are usually most efficient when producing lower water temperatures than a traditional gas or oil boiler. A boiler may have been set to send water to radiators at 70°C or more. A well-designed heat-pump system might operate much of the time at 35°C to 50°C, depending on the building and emitters.

Lower-temperature water contains less immediately available heat, so radiators may need to be larger. The system also tends to run for longer, maintaining a steady indoor temperature rather than delivering short, intense bursts of heat. This is normal operation, not evidence that the unit is struggling.

What the changes mean financially

Grant support reduces the upfront price, but homeowners should assess the whole project rather than subtracting a voucher from the cost of the heat-pump unit alone. A proper installation may include the outdoor unit, cylinder, controls, electrical work, pipe alterations, radiator upgrades, system cleaning, commissioning and removal of the old appliance.

Ground-source systems usually involve additional excavation or borehole work. Air-to-air installations may avoid extensive wet-system alterations but can require several indoor fan units and a separate hot-water solution. Biomass systems need fuel storage, regular maintenance and suitable access for deliveries.

Running costs cannot be predicted responsibly from the grant amount or the heat pump’s advertised efficiency. They depend on the property’s heat loss, electricity tariff, required flow temperature, seasonal efficiency and household habits. A poorly designed heat pump operating at unnecessarily high temperatures may cost considerably more to run than a correctly sized system with weather compensation.

When comparing quotations, ask for the calculated design heat loss, proposed flow temperature and expected seasonal performance. Quotations should also state which radiators will be changed, how hot water will be produced, whether electrical upgrades are required and what work is excluded.

Households should be cautious about claims that a heat pump will always cut bills. It may do so in the right property, particularly when replacing expensive direct electric, LPG or oil heating, but the comparison with an efficient gas boiler is more sensitive to energy prices and system performance.

Why property surveys matter locally

The housing stock around East Hampshire and the Surrey border is varied. Bordon and Whitehill include newer developments alongside older military and post-war properties. Newer homes may have better insulation and lower heating loads, although compact plant space can affect cylinder and equipment choices.

Liphook and Haslemere have many detached and character properties, some with extensions added at different times. Heat loss can vary substantially between the original building and newer sections. In wooded or tightly landscaped plots, outdoor-unit position, airflow and noise need careful consideration.

Alton and Farnham include period terraces, cottages, larger family homes and listed or conservation-sensitive buildings. Solid walls, suspended floors, older radiators and restricted external locations can influence both the design temperature and planning position. Ground-source collectors may suit a property with sufficient land, but they are rarely a simple option for a small town-centre plot.

Local climate also matters, but not in the way some homeowners fear. Modern heat pumps continue operating in cold weather. The installer must size the equipment using an appropriate local design temperature rather than relying on a national average or the boiler’s existing output rating.

Does a home need insulation before a heat pump?

A property does not need to meet new-build standards before a heat pump can work. However, reducing avoidable heat loss can allow a smaller unit, lower flow temperatures and lower running costs.

Sensible improvements may include loft insulation, draught reduction, cavity-wall insulation where appropriate and repairs to poorly fitting doors or windows. Solid-wall insulation is a more substantial project and needs proper moisture assessment, especially in traditional buildings.

Insulation should not be considered in isolation from ventilation. Making a home more airtight without managing moisture can contribute to condensation and mould. Extract ventilation in kitchens and bathrooms should be checked as part of a wider retrofit plan.

The key document for heating design is a room-by-room heat-loss calculation. This assesses the dimensions, construction, windows, ventilation losses and target temperature for each room. It then determines the required radiator, underfloor or air-delivery output. Simply replacing a boiler with a heat pump of a similar kilowatt rating is not adequate design.

Where biomass may still fit

Eligible biomass boilers remain relevant in limited circumstances, particularly for some rural, off-gas properties that have high heat demand and enough space for equipment and fuel storage. They burn a renewable fuel such as wood pellets and can supply a conventional wet heating system at higher temperatures than many heat pumps.

However, biomass is not maintenance-free. Fuel quality, ash removal, servicing, flue arrangements, local air-quality requirements and delivery access all need attention. It should not be treated as a direct substitute for every oil boiler merely because a grant category exists.

What homeowners should do before committing

Start by establishing whether the current heating system genuinely needs replacement. If a boiler is reliable, safe and repairable, there may be time to improve insulation, review radiator sizes and plan properly. A distress purchase during a winter breakdown gives far less opportunity to compare technologies.

For a proposed heat pump, insist on a room-by-room heat-loss survey and a written design rather than a price based only on floor area. Check the proposed outdoor-unit location, expected sound levels, condensate drainage, cylinder position and electrical supply. The installer should explain how the home will be heated on the coldest design day and how hot water will be recovered after heavy use.

Confirm that the installer and product meet the certification conditions applying to the amended scheme. Establish who submits the grant application, when funding is confirmed and what happens if the property or installation proves ineligible. Planning permission, permitted-development conditions, leasehold consent and listed-building restrictions should be resolved before equipment is ordered.

Finally, compare like with like. One quotation may include radiator upgrades, electrical work and a new cylinder, while another may show only the heat pump and basic installation. The cheapest figure can become the most expensive option if essential work appears later as a variation.

The practical message behind the new regulations

The expanded Boiler Upgrade Scheme gives homeowners more low-carbon heating options and may reduce the upfront barrier to installation. It does not remove the need for competent engineering. Heat pumps perform best when the building, emitters, controls and household requirements are assessed as one system.

For local households, the right next step is not choosing a product from an advert. It is establishing the property’s heat demand, identifying realistic efficiency improvements and comparing complete system designs under the current grant rules.