The UK government’s Boiler Upgrade Scheme is still running in 2026, offering £7,500 off the cost of a qualifying air source heat pump installation. With the scheme now confirmed through to at least 2030, that money is not going anywhere soon.
But the grant is only part of the picture. The question most homeowners are actually asking is simpler: does it work, and will it work for my home?
At Eco Heating Specialists, we are a technically led company built on decades of hands-on heating and engineering experience. We do not sell standard packages or make assumptions about what a property needs. This guide gives you straight answers to every question you are likely to have.
What Is an Air Source Heat Pump?
An air source heat pump (ASHP) is a heating system that extracts warmth from the outside air and uses it to heat your home and hot water. It works on the same principle as a refrigerator, but in reverse: moving heat from outside to inside rather than generating it by burning fuel.
Because the system moves heat rather than creates it, an ASHP is two and a half to four times more efficient than a conventional gas boiler. That efficiency is expressed as a Coefficient of Performance, or COP. A COP of 3.5 means the system delivers 3.5 units of heat for every 1 unit of electricity it consumes.
Most UK domestic installations use air-to-water heat pumps, which connect to your existing wet central heating system (radiators or underfloor heating) and a hot water cylinder. That is what Eco Heating Specialists designs and installs.
How Does an Air Source Heat Pump Work?
The process follows four stages, repeated continuously:
- Air intake: A fan draws outside air across a refrigerant-filled evaporator coil. Even in cold UK temperatures, the air contains enough thermal energy to cause the refrigerant to evaporate into a gas.
- Compression: A compressor increases the pressure of the refrigerant gas, raising its temperature significantly.
- Heat transfer: The hot refrigerant passes through a heat exchanger, transferring warmth into the water circulating through your radiators and hot water cylinder.
- Expansion: The refrigerant cools, expands back to a liquid, and the cycle begins again.
One thing worth understanding: air source heat pumps run at lower flow temperatures than gas boilers, typically 35 to 55°C rather than 70 to 80°C. The system heats your home gradually and continuously rather than in short, intense bursts. This is a different way of delivering warmth, and it is one reason why correct system design matters so much. A heat pump connected to an undersized radiator circuit will never perform properly.
Does an Air Source Heat Pump Work in the UK?
Yes. Modern air source heat pumps are built to operate reliably at temperatures as low as -15°C to -25°C, depending on the model. UK winter temperatures rarely fall below -5°C, so your system will run without issue throughout the year.
Efficiency does drop slightly on the coldest days. A typical ASHP might achieve a COP of 3.5 in mild autumn weather and around 2.0 during a hard frost. But heating output is maintained throughout. Even at a COP of 2.0, the system delivers twice the heat output of the electricity going in, which is still more efficient than direct electric heating.
The bigger factor for UK performance is not temperature. It is correct system design and a proper heat loss assessment before installation.
What Does an Air Source Heat Pump Cost to Install in 2026?
Installation costs across the UK typically range from £7,000 to £14,000 for a fully installed system, covering the unit, labour, commissioning and any pipework or cylinder upgrades required. The main variables are:
- Property size and calculated heat demand
- Whether existing radiators need upsizing
- Whether a new hot water cylinder is required
- Complexity of pipework and electrical work
Well-insulated modern homes generally sit at the lower end of that range. Older or larger properties, particularly those with small original radiators, are likely to require additional work.
The Boiler Upgrade Scheme: £7,500 Off in 2026
The Boiler Upgrade Scheme (BUS) is a UK government grant administered by Ofgem. It provides £7,500 directly off the cost of a qualifying air source heat pump installation in England and Wales. Your MCS-certified installer applies for and redeems the grant voucher on your behalf. The discount comes off your invoice before you pay.
Who qualifies:
- Property owners in England or Wales (residential or small commercial)
- Must be replacing an existing fossil fuel system: gas, oil or LPG
- New builds and social housing are not eligible
- No means testing. The grant is available regardless of income
- Properties that have already received government heat pump funding are not eligible
Scotland: The Home Energy Scotland scheme offers up to £15,000 (a £7,500 grant plus up to £7,500 interest-free loan) for qualifying properties.
After the £7,500 grant, many homeowners find their net cost sits between £1,500 and £6,500. In a number of cases, that is less than the cost of a premium boiler replacement.
The scheme is confirmed through 2030 with increasing annual budgets. Demand is growing year on year: over 100,000 applications had been made by late 2025. Installers can only hold a limited number of voucher slots at any one time, so it is worth enquiring sooner rather than later.
What Does an Air Source Heat Pump Cost to Run?
Based on current energy prices (electricity at approximately 27p/kWh in 2026), a typical well-insulated UK home can expect annual heating costs of around £750 to £1,200 per year from an air source heat pump.
For comparison, a gas boiler heating the same home uses roughly 11,500 kWh of gas annually. An ASHP with a seasonal performance factor of 2.8 to 3.5 uses significantly less electricity to deliver the same heat output. Electricity costs more per unit than gas, but the pump’s efficiency means total annual costs are broadly comparable, and considerably cheaper than oil or LPG.
Running costs can fall further if you:
- Switch to a heat pump-optimised electricity tariff (several are available through suppliers such as Octopus Energy)
- Add solar panels to offset daytime electricity use
- Improve insulation before or alongside installation
The honest answer is that running costs vary by property. A generic online calculator will not give you an accurate figure. A proper heat loss survey and system specification will.
Is My Home Suitable?
Air source heat pumps are not limited to new builds. Many older and larger properties across West Yorkshire and the wider UK have been successfully upgraded. The key factors to consider are:
Insulation: The better insulated your home, the lower the flow temperature your heat pump needs, and the more efficiently it runs. Loft and cavity wall insulation make a meaningful difference, but are no longer a legal requirement for the Boiler Upgrade Scheme grant.
Radiators: Heat pumps work at lower temperatures than boilers. In some homes, existing radiators are sufficient. In others, upsizing a number of radiators improves performance significantly. A heat loss calculation tells you exactly what your home needs before a penny is spent.
Outdoor space: The outdoor unit is roughly the size of an air conditioning condenser. It requires wall or ground mounting with clear airflow around it. Most installations fall under permitted development, meaning no planning permission is required, subject to standard conditions.
Hot water cylinder: Air-to-water systems need a hot water cylinder. If you currently have a combi boiler with no cylinder, one will be installed as part of the job.
Why Heat Loss Calculations Are Not Optional
A heat loss calculation is a detailed engineering assessment of how much heat your home loses through its walls, floors, roof and windows at the coldest expected outdoor temperature. It determines the correct size of heat pump for your property and the correct radiator sizes needed to distribute that heat.
An oversized heat pump short-cycles. It fires up, reaches temperature quickly, then shuts off before completing a proper run. Running costs increase, and the system wears out faster than it should.
An undersized heat pump struggles on cold days, leaving rooms short of warmth and relying on expensive electric backup elements to make up the difference.
Both problems are avoidable. Both come down to getting the sizing right before installation starts.
Chris Pearce, our Technical Director, has 26 years of heating engineering experience. For 23 of those years he worked within a local government authority delivering gas installation, maintenance and repair services. That environment required strict compliance, accurate documentation and consistent workmanship. Those standards now shape how every EHS project is assessed and specified.
Rob Lewis, our Engineering Director, is a Civil-Geotechnical Engineer and Managing Director of GeoEnviro Solutions Ltd. Through that work, he has been directly involved in the drilling and installation of ground source heat pump loops, with a hands-on understanding of how these systems interact with ground conditions, site constraints and long-term performance. He began his career in the electricity generation industry with Powergen, so his knowledge of energy systems runs from generation through to end use. When Rob reviews a system design, it gets a level of engineering scrutiny that a standard heating installer simply cannot provide.
Every EHS project starts with a proper heat loss survey. We do not estimate. We do not use rule-of-thumb sizing. We assess the property, specify the system correctly, and install it to perform over the long term.
Air Source Heat Pump vs Gas Boiler: A Direct Comparison
| Air Source Heat Pump | Gas Boiler | |
|---|---|---|
| Efficiency | 250 to 400% (COP 2.5 to 4.0) | 85 to 92% |
| Fuel | Electricity | Natural gas |
| Carbon emissions | Low | Medium to high |
| Install cost (2026) | £7,000 to £14,000 (£7,500 grant available) | £2,000 to £4,000 |
| Typical annual running cost | £750 to £1,200 | £900 to £1,400 |
| Expected lifespan | 15 to 20+ years | 10 to 15 years |
| Government incentive | £7,500 BUS grant | None |
| Cooling capability | Some models | No |
What Does Installation Involve?
A typical air source heat pump installation takes two to five days, depending on the scope of work. At Eco Heating Specialists the process follows this sequence:
- Pre-installation heat loss survey and system design, sized correctly for your property
- Boiler Upgrade Scheme application, handled by us on your behalf
- Removal of existing heating equipment where required
- Installation of the outdoor unit and any groundwork or brackets needed
- Connection to the heating circuit, including any radiator upgrades identified at the survey
- Cylinder installation or connection for domestic hot water
- Full commissioning and system testing, documented and signed off
- Handover, where we walk you through the controls and answer your questions
We provide full documentation throughout. Every installation is completed to MCS standards and current regulations.
Frequently Asked Questions
Will a heat pump work in an older Yorkshire stone house? Older stone properties can work well with a heat pump, but they need careful heat loss assessment and often benefit from targeted insulation work beforehand. We assess these properties honestly and will tell you straight if the numbers do not stack up.
Do I need to replace all my radiators? Not necessarily. The heat loss survey will identify which radiators, if any, need upsizing. In well-insulated rooms, existing radiators are often fine.
How noisy is the outdoor unit? Modern units typically run at around 40 to 50 dB, which is similar to a quiet conversation. Careful siting away from bedrooms and neighbouring windows reduces any impact further.
Can I get the grant if I already have solar panels? Yes. The Boiler Upgrade Scheme is compatible with existing solar PV. It does not affect your eligibility.
Do I need planning permission? In most cases, no. Air source heat pumps in England are generally permitted development, subject to standard size and siting conditions. We check the rules for every property before we start.
Thinking About an Air Source Heat Pump in West Yorkshire or Across the UK?
Eco Heating Specialists is based in Kirklees and works across Huddersfield, West Yorkshire and beyond. We are a technically led company, not a sales organisation. Our assessments are thorough, our advice is honest, and our installations are built for long-term performance.
If you are considering a heat pump, the right first step is a proper conversation. We will tell you whether it makes sense for your home, what it will genuinely cost, and how the Boiler Upgrade Scheme application works.
Request a free consultation with the EHS team
Eco Heating Specialists Ltd is a Kirklees-based renewable heating company founded by Chris Pearce and Rob Lewis. We design and install air source heat pumps, ground source heat pumps and solar heating systems for homeowners, landlords and small developments across West Yorkshire and the UK.
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