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

The Boiler Upgrade Scheme (BUS) is the main financial incentive available to homeowners in England and Wales switching to renewable heating. With substantial support 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?

1. The Right Property

• Property in England or Wales (Scotland has its own equivalent scheme)
• You must own the property. Homeowners, private landlords and some small non-domestic property owners can qualify. Tenants cannot apply; the owner must.
• Installation capacity up to 45kWth, which covers the overwhelming majority of homes

2. The EPC Requirement Has Been Removed

This used to be the condition that stopped more applications than any other: you needed a valid EPC with no outstanding loft or cavity wall insulation recommendations. The EPC and insulation precondition has since been removed. Rather than repeat a date here that may not be current, check the position on GOV.UK before you apply — the criteria have changed more than once.

Insulation still matters in practice. Your installer will size the system against your actual heat loss and may well recommend insulation improvements for running costs — but that is a design consideration now, not a grant gate.

3. The Right Installer

Your installer must be MCS certified for heat pump installation. This is not negotiable — the grant is applied for by the installer on your behalf and is simply not available through a non-MCS installer.

Honest note: Smith EcoFlow does not install air-to-water heat pumps and is not MCS certified, so I cannot deliver a grant-funded installation. I service, repair and optimise heat pumps once they are in. For a new installation you will need an MCS installer separately — and I am happy to look after the system afterwards.

4. The Right System

• The heat pump must replace an existing heating system. The scheme originally required that to be a fossil-fuel system, but the qualifying systems have been broadened — the qualifying systems are set out on GOV.UK and have been broadened since launch. Confirm the current position for your property there rather than relying on any article, including this one.
• It must be sized correctly via a proper heat loss calculation
• It must be the primary heating source, not a supplementary one

The scheme has also been broadened to cover technologies it previously excluded, at differing grant levels. Amounts and qualifying technologies have changed more than once, so check the current figures rather than relying on any article — including this one.

What the £7,500 Actually Covers

The headline grant for an air source heat pump has been £7,500, and a higher temporary rate has applied to some off-gas-grid homes replacing oil or LPG. Amounts and qualifying technologies have changed several times, so confirm the current figure before budgeting. 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 Eligibility

You can look up an existing EPC at gov.uk/find-energy-certificate, though since April 2026 an EPC is no longer a precondition for applying. It remains useful for understanding your property's insulation and likely running costs.

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.

Where Applications Commonly Come Unstuck

Based on what I see going wrong:

1. Installer not MCS certified — the grant is simply not available otherwise. Always check before signing anything.
2. No proper heat loss calculation — if an installer will not show you one, walk away. It underpins both the grant and a system that actually works.
3. Listed building or conservation area issues — often solvable, but they add time and complication.
4. Insufficient electrical supply — most homes are fine, but some need supply work first.
5. Assuming old rules still apply — several conditions have been removed or changed since the scheme launched. Check the current criteria rather than an old article.

Note that the EPC and insulation conditions that used to block a great many applications have been removed, and the range of eligible technologies and qualifying heating systems has been broadened. Confirm the position that applies to your property with your MCS installer or on GOV.UK — check if you are eligible.

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.