Air source heat pumps (ASHPs) are an efficient and low-carbon source of heating your home, but the purchase price can be a barrier to homeowners being able to afford them without the aid of grants. While programs like the Boiler Upgrade Scheme (BUS) provide a high level of financial support of up to £7,500, checking your eligibility for a Free Heat Pump Grant UK can further help bridge the gap, as standard grants do not always cover the full cost of purchasing an ASHP.
This guide will describe the scope, eligibility, and alternatives for grants that are currently available in the UK in 2026.
What Is an Air Source Heat Pump – and Why Does Cost Matter?
An air source heat pump (ASHP) is a device that draws heat from outside air and transfers it inside with the aid of electricity. Even in the cold climate of the UK, air source heat pumps provide 3-5kW of heating energy for every 1kW of electricity used.
This is no trick of the trade but rather the principles of thermodynamics at work for you. They reduce carbon emissions by as much as 75% compared to gas, and they are the government’s choice for replacing gas boilers as the boiler phase-out draws near.What Does a Full ASHP Installation Actually Cost?
| Property Size | Base Install | With Upgrades | After £7,500 BUS Grant |
| 1–2 Bed | £7,000–£9,000 | £8,500–£12,000 | £0–£4,500 |
| 3 Bed Semi | £8,000–£11,000 | £9,500–£14,000 | £500–£6,500 |
| 4+ Bed | £10,000–£13,000 | £12,000–£18,000 | £2,500–£10,500 |
Which Grants Are Available in 2026?
There are several schemes in play right now — and they do not all work the same way. Stacking them correctly is where the savings compound.
The Boiler Upgrade Scheme (BUS): The Main Event
The BUS offers £7,500 for air-to-water and air-to-air ASHPs in England and Wales, running until April 2028. It replaces fossil fuel systems only — gas, oil, electric storage heaters. New builds don’t qualify. Prior low-carbon heating? Also excluded.
The grant is applied for upfront through your MCS-certified installer, who handles the Ofgem application directly. You don’t chase paperwork — you just see a reduced invoice. The post-2024 rule change removed mandatory prior insulation requirements, though it’s still strongly recommended for performance reasons.
ECO4 and GBIS: Targeted, But Powerful
ECO4 — running until March 2026 — is a different beast entirely. It targets low-income households on benefits or with poor EPC ratings (D–G), funding 100% of installation costs via energy suppliers. Tenants qualify. Landlords qualify. There’s no upfront cost, and no grant cap that falls short of reality.
The Great British Insulation Scheme (GBIS) focuses on insulation, but it pairs well with heat pump upgrades for Council Tax Band A–D homes earning under £31,000. It won’t fund the pump itself, but reducing heat loss first makes your ASHP work harder and cheaper.
Scotland runs its own play entirely. Home Energy Scotland (HES) offers up to £15,000, covering the full cost for many installations — and stacks with loan top-ups if needed.
| Scheme | Region | Max Funding | Full Coverage? | Key Target |
| BUS | England/Wales | £7,500 | Rarely | Homeowners replacing fossil fuel |
| ECO4 | Great Britain | 100% costs | Yes (if eligible) | Low-income, poor EPC |
| GBIS | England | Varies | Partial | Low-income, insulation-focused |
| HES | Scotland | £15,000 | Often yes | Scottish homeowners |
Do Grants Ever Cover 100% of Costs?
Yes — but only under specific conditions. Don’t assume you qualify; verify it.
Full coverage is realistic in three scenarios:
- ECO4 eligibility — Universal Credit, Pension Credit, or EPC D–G with high fuel poverty indicators. This route funds 100% routinely.
- Low-cost air-to-air systems — Sub-£8,000 installs on smaller properties where BUS alone bridges the gap.
- Scotland’s HES scheme — Often enough to cover mid-range installations outright, especially when stacked with interest-free loans.
For everyone else? About 70% of installations still require additional funding. Grants typically cover 50–90% of total costs. The remaining gap needs a plan — whether that’s a 0% green loan, supplier deals, or phased upgrades.
Who Actually Qualifies? The Eligibility Reality Check
Getting the grant is one thing. Qualifying for it is another. Here’s what each scheme genuinely requires.
BUS Eligibility
- Homeowner (not tenant)
- Valid EPC (any rating, post-2024 rule change)
- Replacing a fossil fuel system
- MCS-certified installer carrying out the work
- Property must not have previously received low-carbon heating funding
ECO4 Eligibility
- Receipt of qualifying benefits (Universal Credit, Child Tax Credit, Housing Benefit, others)
- EPC rating D–G, or high fuel poverty vulnerability
- Applies across Great Britain excluding Northern Ireland
- Tenants and landlords with vulnerable occupants qualify — no ownership required
Check your EPC at gov.uk. Use Nesta’s heat pump suitability tool before committing to quotes. And don’t overlook noise regulations — outdoor units must comply with permitted development rules near boundaries.
What’s the Long-Term Financial Case?
Why does this actually make financial sense beyond the grant? Because the running costs shift in your favour from day one.
Annual savings typically run £300–£800 on energy bills. Over a 10–20 year lifespan, that compounds significantly. Property values increase 5–10% with low-carbon heating systems installed. Modern units are also designed for efficiency and quiet operation; however, it is important to understand local regulations regarding Heat Pump Noise to ensure your installation remains compliant and unobtrusive.
As gas boiler regulations tighten through the late 2020s, an ASHP becomes a future-proofing asset — not just an environmental one. The maths on a realistic mid-range scenario: £11,000 installation minus £7,500 BUS grant equals £3,500 out of pocket. At £600 annual savings, payback hits around six years. For an ECO4-eligible household, payback is immediate — the install is free, the savings are pure gain.
How to Apply Without Wasting Time
The process is straightforward if you run it in the right order.
- Check your EPC and eligibility at gov.uk
- Obtain at least three quotes from MCS-certified installers — they handle Ofgem applications for BUS
- Ofgem issues a 14-day consent window; your installer deducts the grant from your invoice
- For ECO4, contact energy suppliers directly or apply via energyadvice.ofgem.gov.uk
Use MoneySavingExpert’s grant checker or GreenMatch for comparative quotes. Post-installation, smart controls and heat pump tariffs (such as Octopus Cosy) maximise the efficiency gains.
The Bottom Line
Grants don’t cover everything for everyone. That’s not a reason to stop — it’s a reason to be strategic.
- 0% green loans through MCS-certified installers
- Supplier incentive packages (British Gas, OVO, others)
- Biomass boilers (£5,000 BUS grant, lower install cost)
- Phased upgrades — insulation first, heat pump second
- Hybrid systems (no grant available, but lower upfront cost)
With BUS funding doubled to £295 million and ECO4 closing in March 2026, the window for maximum stacking is narrowing. Act on eligibility checks now, not later.
