Grant news is usually boring, because grants usually change by a few hundred pounds and nobody's decision moves. This one is worth ten minutes of your time — not because £1,500 is life-changing, but because of who it's aimed at and how long it lasts. If you heat your home with oil or LPG, the government has just made the single most expensive part of decarbonising your house materially cheaper, and it has put a hard stop on the offer.
Figures are the published Boiler Upgrade Scheme rates for England and Wales as of late July 2026. Confirm current terms with Ofgem and your MCS-certified installer before committing — the installer applies for the grant on your behalf, not you.
What actually changed on 21 July
The Boiler Upgrade Scheme (BUS) has paid £7,500 towards an air-to-water or ground-source heat pump for a while now. From 21 July 2026, properties that are not connected to the mains gas grid — the roughly 1.7 million English and Welsh homes running on heating oil, LPG or electric storage heaters — can claim £9,000 instead. The uplift runs to 31 March 2027 and, as things stand, stops there.
The logic is straightforward and, for once, fairly sound. Oil-heated homes are the ones getting hammered by fossil fuel price swings they have no protection from, they're often the least efficient houses in the country, and they're exactly where a heat pump wins hardest on running cost. If you're going to spend public money moving people off fossil heating, these are the households where each pound does the most work.
The bits nobody's talking about that matter more
The £9,000 headline has buried three changes from earlier in the year that arguably affect more people:
- The EPC requirement is gone. You no longer need a valid Energy Performance Certificate — and crucially, no longer need to clear loft and cavity insulation recommendations before applying. That barrier killed a lot of applications stone dead.
- Air-to-air heat pumps are finally in the scheme, at £2,500. Less than the air-to-water rate, but it's the first time the technology has been eligible at all — relevant to flats and homes with no wet central heating.
- The grant now comes off your quote up front. Installers must deduct it from the price, so you pay the net figure rather than fronting the full amount and waiting.
- The scheme runs to 2030, not 2028. The base grant isn't about to vanish — only the off-gas uplift has a March 2027 cliff edge.
Figure — What the Boiler Upgrade Scheme pays, by technology (July 2026). The off-gas-grid uplift applies only to air-to-water and ground-source systems, and only until 31 March 2027. Air-to-air, added to the scheme in April 2026, sits well below the rest — which is the crux of this article.
Now the part that makes it a window rather than just a discount
Look at that chart again. Air-to-water gets £7,500 or £9,000. Air-to-air gets £2,500. That gap is a legacy of how the scheme was designed: it assumes a heat pump is a boiler replacement that pushes hot water round radiators, and it treats anything else as a lesser thing.
The industry has just stopped believing that split exists. Within a week of each other this summer, Samsung and Daikin both launched systems that do air-to-air and air-to-water from one outdoor unit. Samsung's EHS Quint is orderable now and recovers waste heat from cooling into your hot water. Daikin's X Series lands in September 2026: one inverter-driven compressor sharing capacity in real time across air-to-air cooling, hydronic heating for radiators or underfloor, and a 180–230 litre hot water store, in homes up to 150m². We covered both in detail in Daikin X Series and Samsung EHS Quint: wait or buy?
Here's why that collides with the grant. A machine like this is, in scheme terms, an air-to-water heat pump — it heats water, it feeds emitters, it makes hot water — that also happens to blow warm or cool air into your rooms. If it's certified and configured as air-to-water, the plain reading is that it attracts the full £7,500, or £9,000 if you're off the gas grid. The £2,500 air-to-air rate wouldn't apply, because it isn't an air-to-air system; it's a system that includes air-to-air among its tricks.
You would be getting cooling — the thing British homes are increasingly desperate for, and the thing the grant has always refused to pay for — funded incidentally by a grant written for heating.
I want to be precise about the confidence level here, because this is exactly the kind of claim the internet will happily overstate. Neither manufacturer has confirmed a BUS grant category for these products, and Ofgem hasn't published guidance on how a combined unit is classified. It is a reasonable inference, not a confirmed fact. Anyone telling you today that the Daikin X Series definitely qualifies for £9,000 is guessing, and so am I. The difference is I'm telling you I'm guessing.
Why it's a short window
Three clocks are running at once, and they're not synchronised:
| Clock | Runs out | What happens |
|---|---|---|
| Off-gas £9,000 uplift | 31 Mar 2027 | Reverts to £7,500 unless extended |
| Daikin X Series availability | From Sept 2026 | First UK units, no independent data yet |
| Convergence products going mainstream | 2027–28 | Volume, competition, real-world figures |
The overlap between "the biggest grant this scheme has ever paid" and "the first generation of one-box systems you can actually order" is roughly September 2026 to March 2027. Six months, minus survey lead times, minus installer availability, minus the fact that nobody has metered one of these things through a British winter.
And there's a second reason to think it closes rather than widens. Grant policy tends to converge on the cheapest way to hit a target. If a combined machine that delivers heating and cooling can claim the full air-to-water rate, that's an obvious anomaly for the Treasury to notice — the likeliest fix is a new intermediate category, not a rate rise. The current position is the generous one. Anomalies like this usually get tidied up, and tidying rarely means "more money."
The honest counterweight
Windows are how you get sold things you didn't need. So: a grant is not a reason to buy a heat pump. A grant is a reason to bring forward a purchase you were already going to make. If your oil boiler has five good years in it, your house is hard to heat, and you haven't got quotes — chasing £1,500 by rushing a £14,000 decision is a bad trade. The uplift is worth about 11% of a typical installed cost. Choosing the wrong system, or the wrong installer, costs a lot more than that.
What I'd actually do, depending on who you are
If you're on oil or LPG and were already planning this
Move. This is the clearest case in the whole article. Get MCS-certified installers out now, because survey-to-commission on a rural off-gas property is routinely three to six months and the March 2027 deadline is on commissioning, not on your good intentions. A typical four-bedroom detached air-source install runs around £13,000–£14,000, so £9,000 leaves you paying roughly £4,000–£5,000 — against oil prices you don't control and can't hedge.
If cooling is part of why you're interested
This is where the window is genuinely valuable, and where I'd wait a little. The Daikin doesn't ship until September and has published no COP or SCOP figures; Samsung's numbers are Samsung's own and no independent UK data exists yet. Watch for two things specifically: the first metered winter results, and any MCS or Ofgem statement on how a combined unit is categorised. If the answer comes back "full air-to-water rate", that's your moment. If it comes back with a new lower category, you've lost nothing by waiting and learned something important.
If you're on mains gas
None of the uplift applies to you — you're on £7,500, and that isn't going anywhere until 2030. The convergence products are still interesting, but you have time. Use it.
If your house doesn't suit air-to-water at all
Worth saying plainly, because I've lived it: when a Heat Geek installer surveyed my own house for air-to-water, the quote came back at £27,000 before grant — about £19,500 after BUS. I went a different way: a Daikin air-to-air multi-split heating the three main living areas plus a Sunamp thermal battery for hot water, for around £10,000 all in, and my whole-home Octopus direct debit is £20 a month. Under the current rules that route attracts £2,500, not £9,000, which is precisely the distortion the new one-box systems may dissolve. If your house is old, leaky, or full of small-bore pipework, run both numbers before you let a grant figure make the decision for you.
The bottom line
The £9,000 is real, it's live, and for oil and LPG households it's the best offer the Boiler Upgrade Scheme has ever made. It expires on 31 March 2027. In the same six-month stretch, the first systems that collapse the air-to-air / air-to-water divide reach UK homes — and if they're classified as air-to-water, some households will get cooling paid for by a heating grant.
That combination is unusual enough to call a golden window. It is not unusual enough to justify rushing. Get your quotes now so that when the classification question is answered, you're in a position to act on it rather than starting from scratch. The households who do badly out of the next eight months won't be the ones who waited — they'll be the ones who did nothing and then panicked in February.