Boiler Upgrade Scheme 2026: How to Get Your £7,500 Heat Pump Grant Explained

The Boiler Upgrade Scheme (BUS) is the single biggest financial incentive available to UK homeowners switching to renewable heating. With £7,500 off the cost of an Air Source Heat Pump installation, it's transformed the maths for thousands of households across South East London and Kent. But the scheme is also widely misunderstood — and a surprising number of homeowners get rejected on technicalities that could have been avoided.

I service heat pumps across Orpington, Bromley, Sevenoaks and the wider Kent region every week, and I've seen first-hand which BUS applications go smoothly and which run into trouble. Here's a clear, no-nonsense guide to getting your grant approved in 2026.

What Is the Boiler Upgrade Scheme?

BUS is a UK government scheme administered by Ofgem. It provides one-off grants to homeowners and small landlords to help replace fossil-fuel heating systems with renewable alternatives:

• £7,500 for an Air Source Heat Pump
• £7,500 for a Ground Source Heat Pump
• £5,000 for a Biomass boiler (in rural areas only)

The scheme has been confirmed to run until at least 2028 with a £1.5 billion budget allocation, so there's no urgency-induced rush — but the grants are first-come, first-served within the annual budget.

Are You Eligible?

Eligibility comes down to several specific criteria. To qualify in 2026 you need:

1. The Right Property

• Property in England or Wales (Scotland has its own equivalent scheme)
• Domestic property (your home, or a small landlord's property)
• Owner of the property OR have permission from the owner
• Property must have a current Energy Performance Certificate (EPC)

2. A Valid EPC

Your EPC must be less than 10 years old AND must have no outstanding insulation recommendations for loft insulation or cavity wall insulation. This catches more applications out than anything else.

If your EPC says you should have loft insulation but you don't, you'll need to install it before applying. Same for cavity wall insulation. The good news: a new EPC after the upgrades is straightforward to arrange.

3. The Right Installer

Your installer must be MCS (Microgeneration Certification Scheme) certified specifically for heat pump installation. This is non-negotiable — the grant simply isn't available through non-MCS installers.

Honest note: Smith EcoFlow doesn't install heat pumps. We service and repair them. So for a new installation, you'll need to find an MCS installer separately. Once installed, we can keep your system serviced and running for years to come.

4. The Right System

• The heat pump must replace a fossil-fuel boiler (gas, oil, LPG)
• It must be sized correctly via a heat loss calculation
• It must be the primary heating source, not supplementary
• The installation must comply with MCS standards

What the £7,500 Actually Covers

The grant is a flat £7,500 regardless of installation cost. A typical Air Source Heat Pump installation in 2026 costs £12,000–£18,000 depending on:

• System size (kW rating needed for your property)
• Whether you need cylinder upgrades (existing cylinders rarely work)
• Whether you need radiator upgrades (about half of installs do)
• Pipework modifications
• Electrical supply upgrades
• Outdoor unit positioning and noise considerations

So for most homes the grant covers 40–60% of total cost. Your out-of-pocket spend after the grant typically lands between £5,000 and £10,500.

The Application Process — Step by Step

Step 1: Get an MCS-Certified Installer to Quote

Get at least 2–3 quotes. Pricing varies significantly. The installer will visit, do a heat loss survey, and produce a detailed quote.

Step 2: Confirm Your EPC

Find your current EPC at gov.uk/find-energy-certificate. Check it's under 10 years old and has no outstanding insulation recommendations.

Step 3: Sign the Installer's Quote

Once you sign, the installer applies for your BUS voucher. This typically takes 2–3 weeks for approval.

Step 4: Installation

Once the voucher is approved, installation takes 3–5 days. The installer manages all paperwork.

Step 5: Final Paperwork

The installer claims the £7,500 from Ofgem after completion and discounts it from your final invoice.

The Most Common Reasons Applications Get Rejected

Based on applications I've seen go wrong:

1. EPC out of date — over 10 years old. Solution: get a new EPC done.
2. EPC shows outstanding insulation work — fix the insulation first.
3. Installer not MCS certified — always check before signing anything.
4. Heat pump replacing electric heating — the scheme requires replacing fossil fuel.
5. Listed building issues — sometimes solvable, but adds significant complication.
6. Insufficient electrical supply — most homes are fine, but some need supply upgrades first.

Should You Wait or Act Now?

The scheme runs until at least 2028 with confirmed funding. There's no need to rush, but two things to consider:

• Energy prices are volatile — the case for renewable heating gets stronger when gas prices spike
• The grant amount has gone up recently (it was £5,000 originally) — there's no guarantee it stays at £7,500 forever

If your boiler is ageing (10+ years old) and you're already considering a replacement, the grant makes the heat pump option financially competitive. If your boiler is recent, there's no rush.

After Installation: Don't Forget the Servicing

Once your new heat pump is installed and commissioned, the installer's job is largely done. From that point, ongoing servicing is essential to keep your manufacturer warranty valid and your system running efficiently. That's where Smith EcoFlow comes in.