An installer who fitted his own heat pump says the £7,500 Boiler Upgrade Scheme grant covered just under half the final bill. That is the blunt arithmetic behind the government’s flagship heat pump incentive, as reported by Installer Online. For the thousands of UK households weighing a switch from gas, this is the kind of real-world data that marketing brochures rarely supply.
What a heat pump actually costs, and what the grant covers
The installer’s project cost roughly £16,000 for a 12kW air-source heat pump, including new radiators, a hot water cylinder, and pipework modifications. The BUS grant knocked £7,500 off, leaving a net cost of £8,500. Ofgem data shows the average BUS grant claim since April 2024 sits at £7,500, but the typical installation ranges from £10,000 to £18,000 depending on property size and existing heating system. For a 3-bed semi, the grant typically covers 40-50% of the total. The remaining sum, often £6,000 to £9,000, still stings for most households, even with VAT at 0% on heat pumps until 2027.
Who qualifies, and who doesn’t
The BUS is open to homeowners and small landlords in England and Wales. Scotland has its own Home Energy Scotland loan scheme, which can stack with the grant. To qualify, your property must have a valid EPC with no outstanding loft or cavity wall insulation recommendations. This is the catch that trips up many applicants. Energy Saving Trust figures suggest one in three homes fails this check because of uninsulated walls or a loft with less than 270mm of insulation. The installer in the article spent £2,000 on additional insulation before the heat pump went in, a prerequisite that adds to the upfront cost but improves the system’s efficiency by roughly 25%.
EPC impact and running costs
Once installed, the heat pump lifted the installer’s EPC from band D to band B, a three-band jump. That is unusually dramatic; most homes see one or two bands depending on starting efficiency. The annual running cost came in at £680, compared with £1,100 for the old gas boiler, a saving of £420. At that rate, the net installation cost pays back in roughly 20 years, too long for many households. But the EPC improvement alone can add 2-4% to a property’s value, according to Nationwide’s 2023 research, which for an average UK home worth £280,000 means £5,600 to £11,200 in added equity.
What this means for your decision
The installer’s verdict is honest: heat pumps work well in well-insulated homes with enough space for the outdoor unit and a hot water cylinder. They are not a like-for-like swap for a combi boiler in a flat or a draughty Victorian terrace. The government’s target of 600,000 heat pump installations per year by 2028 looks ambitious when the typical homeowner still faces a £6,000-£9,000 gap after the grant. But for those who can afford the upfront cost and meet the insulation criteria, the long-term savings and EPC boost are real. The BUS grant remains open until March 2027. Households considering a switch should get a MCS-certified installer quote now, before the scheme’s budget runs out, applications hit 3,000 per month in early 2025, and the pot is finite.
Frequently Asked Questions
No. The Boiler Upgrade Scheme requires your EPC to have no outstanding recommendations for loft or cavity wall insulation. If your EPC is band E or below, you will need to insulate first, which can cost £1,500-£4,000, before applying.
For a typical 3-bed semi, the net cost after the £7,500 grant is around £6,000-£9,000. With annual savings of roughly £300-£500 on heating bills, the payback period is 12-30 years. The EPC uplift and property value increase can shorten this, but it remains a long-term investment.
