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The short answer? Potentially thousands. The longer answer depends on your property, your current system, and whether you’re actually making the most of what’s available — which most homeowners aren’t.
The Boiler Upgrade Scheme (BUS) hands eligible UK homeowners up to £7,500 toward a heat pump installation. That’s not a loan. Not a rebate drip-fed over years. A direct grant, applied before you pay a penny on labour. If you’re still running a gas boiler or oil heating in 2026, you’re leaving money on the table.
What Is the Boiler Upgrade Scheme, Really?
Most people have heard of BUS. Fewer understand how it actually works — and that gap costs them.
Administered by Ofgem, the scheme funds low-carbon heating replacements across England and Wales. It’s not a blanket energy efficiency programme. It’s laser-focused on three technologies: air source heat pumps, ground source heat pumps, and biomass boilers. No gas boiler swaps. No insulation bundles. Just the switch to low-carbon heat.
What does the grant actually cover?
The current grant values in 2026 are:
| Technology | Grant Amount |
| Air Source Heat Pump | £7,500 |
| Ground Source Heat Pump | £7,500 |
| Biomass Boiler | £5,000 |
One grant. One property. Applied directly by your MCS-certified installer through Ofgem’s voucher system — you never handle the paperwork. The scheme’s 2026 budget exceeds £295 million, so availability isn’t the issue. Eligibility is.
Check your Eligibility Now
If you are receiving benefits from the UK Government then you might be eligible for free insulation grants.
Who Actually Qualifies?
This is where people trip up. BUS isn’t means-tested, which means your income is irrelevant. What matters is your property and your current heating system.
You qualify if you own a property in England or Wales, currently heat it with fossil fuels (gas, oil, LPG) or direct electric heating, and hold a valid EPC with no outstanding critical insulation recommendations. Landlords can apply for rental properties. Private tenants cannot apply directly — that’s a common misconception.
What disqualifies you?
- Already have a heat pump installed
- New build with no prior heating system
- Property outside England or Wales
- EPC flags unresolved insulation issues
Off-grid properties — those on oil or LPG — are arguably the biggest winners here. You’re already paying premium fuel prices, so the financial case for switching is overwhelming.
Fix your EPC first if needed. A loft insulation upgrade costing £300 could unlock a £7,500 grant. That’s not a difficult calculation.
Breaking Down the Real Upfront Savings
How do the numbers stack up?
| Cost Factor | Air Source HP | Gas Boiler |
| Installed Cost | £7,000–£13,500 | £2,500–£4,500 |
| BUS Grant | -£7,500 | None |
| VAT Saving | -£1,000–£2,000 | None |
| Effective Net Cost | ~£3,500–£5,000 | £3,500–£4,500 |
What Are the Ongoing Bill Savings?
Here’s where the expert community gets divided — and where most comparisons mislead people.
At 2026 energy prices (electricity at 24.5p/kWh, gas at 6.4p/kWh), a heat pump running at a COP of 3.5 delivers heat at roughly 7p per kWh effective cost. That matches gas. But electricity prices carry more volatility than gas historically, which is why insulation quality becomes the deciding factor in your actual savings.
What can you realistically expect to save annually?
- Well-insulated home (EPC B+): £400–£600 vs gas boiler
- Average home (EPC C/D): £200–£400 vs gas boiler
- Off-grid oil/LPG home: £800–£1,200+ per year
The off-grid case is exceptional. Oil heating runs at an effective 10p+/kWh in 2026. A heat pump at 7p effective cost cuts bills by 30–40% immediately. One EPC C property dropping from £1,200 oil bills to £700 with a heat pump is not an outlier — it’s typical.
The 20-Year Financial Case
Short-term savings are easy to dismiss. Long-term numbers are harder to argue with.
Over 20 years, the total cost of ownership for a post-BUS heat pump versus a gas boiler breaks down as follows:
| Cost Category | Heat Pump (Post-BUS) | Gas Boiler | Net Savings |
| Installation | £5,000 | £3,500 | -£1,500 |
| Running Costs | £20,600 | £22,500 | +£1,900 |
| Maintenance | £2,500 | £2,000 | -£500 |
| Replacement (yr 13) | £0 | £4,000 | +£4,000 |
| Total | £28,100 | £32,000 | £3,900 |
That mid-life boiler replacement is the figure most people forget. Gas boilers don’t last 20 years without a £3,000–£4,000 swap. Heat pumps, properly maintained, do. That single factor turns a marginal saving into a decisive one.
How to Apply Without Wasting Time
The application process is simpler than most government schemes — because homeowners don’t actually apply. Your MCS-certified installer does.
The process is in four steps:
- Check your EPC — resolve any flagged insulation issues first (£50–£100 for a new EPC if needed)
- Get quotes from MCS-certified installers via Ofgem’s approved list
- The installer submits your voucher application pre-installation via the GOV.UK portal
- Post-installation, evidence is submitted and payment processed — typically within 4–6 weeks
There is no homeowner portal. No forms to complete yourself. Your installer manages the process as part of the service. If any firm is asking you to handle Ofgem submissions directly, walk away.
Low-income households should also explore ECO4 simultaneously — in some cases, full funding is available through energy suppliers with no grant cap.
Final Thoughts
Heat pumps eliminate combustion from your home entirely, no NOx emissions, no carbon monoxide risk, no flue. Indoor air quality improves measurably. The operation is quieter than a gas boiler in most installations. Smart controls mean the system learns your schedule and optimizes itself.
Property value uplift of 3–5% is increasingly documented for homes with green heating credentials, particularly as EPC ratings become a material factor in mortgage lending and sale negotiations post-2025.
The gas boiler ban on new builds is already law. Retrofit bans are coming. Installing now means you’re ahead of legislation, ahead of demand surges, and ahead of installer waiting lists that will only grow.
Frequently Asked Questions
Yes. The 2026 budget exceeds £295 million. Availability isn’t the problem — most rejections come down to EPC issues or using a non-MCS-certified installer.
Yes. Landlords apply on behalf of the property. Private tenants cannot apply directly — but low-income tenants may qualify for full funding through ECO4 via their energy supplier.
It matters significantly. Oil and LPG properties see the fastest payback — often under 5 years. Gas-heated, well-insulated homes still benefit, but the numbers are tighter. Direct electric heating is also eligible and typically a strong candidate.
Fix them first. Outstanding critical recommendations block eligibility. A £300 loft insulation job unlocking a £7,500 grant is not a difficult decision.
Neither. No income threshold. No tax liability. It applies regardless of earnings — one of the few government schemes that doesn’t penalise higher earners for participating.
Typically 6–10 weeks — EPC check, installer quotes, voucher approval, and installation scheduling. Start the EPC first. That’s where delays most commonly occur.
Get Your ECO4 Grant
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