Are Commercial Heat Pump Grants Worth Claiming?

Commercial heat pump grants come with a reputation for being more trouble than they are worth. Competitive windows, eligibility hoops, technical evidence, completion deadlines, it is easy to look at all of that and conclude the funding is not worth the effort. For a decision-maker weighing a six- or seven-figure decarbonisation project against a busy day job, that is a reasonable instinct. So it is worth asking plainly: are commercial heat pump grants actually worth claiming, or is the paperwork the better part of the prize?

The short answer is that where a route is open and you are eligible the funding is usually worth claiming, but only when the grant case and the engineering case are built together, and only when you go in with eyes open about which route fits. This guide weighs the effort against the payoff so you can make that call.

First, put the £7,500 figure in context

A lot of the scepticism comes from a misunderstanding. Businesses hear about the £7,500 Boiler Upgrade Scheme (BUS), assume it is the whole offer, then dismiss it as too small for a building-scale project. In England and Wales BUS is not limited to homes: small non-domestic buildings can qualify, so confirm eligibility with the installer and Ofgem. It pays a flat grant per installation, up to 45 kWth, so it suits small systems rather than building-scale plant.

The other routes are different in kind, and some were far larger, but the position has changed. So the honest first step is to check what is actually open to your building today, and to treat any closed scheme as history rather than a plan.

What is genuinely on offer

Which routes are open matters more than how large the headline numbers once were.

• Public Sector Decarbonisation Scheme (PSDS). This is for public bodies such as NHS trusts, schools and councils. Phase 4 closed to new applications in November 2024, there is no open application window and no confirmed successor, and funded projects continue to 2027/28. Do not plan a new bid around it; check gov.uk for any announcement.
• Industrial Energy Transformation Fund (IETF). This fund for industrial fuel-switching is closed: gov.uk guidance lists it as closed from July 2025, with no further extension and no successor planned. Projects already funded continue. It is not an available route for a new project.
• Green Heat Network Fund (GHNF). For new or expanded heat networks in England and Wales, open to public, private and third-sector organisations (not individuals or sole traders). Funding can be drawn down until 2029-30. Round 12 closed on 25 September 2026, so check gov.uk for the next round.
• The Annual Investment Allowance and other capital allowances. Tax reliefs on qualifying plant and machinery, with the Annual Investment Allowance set at £1m a year. Relief applies to the cost the business itself funds, so a grant reduces the qualifying spend. This needs no competitive bid, only correct accounting treatment, so confirm it with an accountant.

That last point matters for the worth-it question. Even an organisation that does not qualify for, or chooses not to pursue, a competitive grant can almost always use capital allowances, and those require very little extra effort beyond a conversation with your accountant.

What claiming actually involves

The effort is real, but it is largely effort you would expend on a serious project regardless. A credible application needs your half-hourly meter data and at least 12 months of fuel consumption, a heat-loss survey, and a system specified to recognised standards, BS EN 14825 for SCOP and BS EN 14511 for rated COP, with an MCS-certified installer for systems up to 45 kW thermal. It needs the DNO supply enquiry started early, because a supply upgrade can be the longest-lead item and grants carry fixed completion deadlines. And it needs the bid built around the funder’s rules rather than bolted on afterwards.

Here is the key insight: none of that is wasted work. The data gathering, the heat-loss survey and the standards-based design are exactly what you need for an honest business case in the first place. A grant application built properly is the same evidence pack you would want before spending capital anyway. The marginal effort of turning that pack into a funding bid is small relative to the funding it unlocks. The risk to manage is timing: a competitive window with a hard deadline rewards organisations that start early and penalises those that leave the grid enquiry late.

When it is clearly worth it

For a small non-domestic building needing a system up to 45 kWth, BUS is a straightforward flat grant worth checking first. For a campus or cluster of buildings, GHNF can change the economics of a shared energy centre, so watch for the next round. PSDS and IETF are closed, so they are not options for a new project. And for almost any private company, capital allowances are worth discussing with an accountant on effort grounds alone, because the work involved is minimal.

When to think harder

The grants are not automatically worth chasing in every case. If your building has poor fabric and high-temperature emitters that would need a full strip-out, the total project cost may outrun even a generous grant; here a hybrid boiler-replacement retrofit is often the smarter, more fundable route, because the heat pump carries 70 to 90% of annual load while a peaking boiler covers the coldest days, keeping the capital ask, and the grant case, sensible. If you are a private commercial landlord with a larger system and no route into GHNF, capital allowances may be the only realistic lever, and that is fine, it is still worth using. And if a competitive window is about to close and your grid enquiry has not started, it may be wiser to plan for the next round than to rush a weak bid.

An honest illustration

As a purely hypothetical example, not a real project: a public body with a year-round heating and hot-water load on a failing gas boiler. Where a grant absorbs most of the spend above a like-for-like boiler replacement, the question stops being conventional payback and becomes whether to spend its own capital on a fossil replacement or let a scheme fund a low-carbon one. That is how PSDS worked while it was open, and why public bodies should watch gov.uk for any successor. The figures depend on your building, your eligibility and the scheme rules in force at the time.

The verdict

Where a route is open and you are eligible, commercial heat pump grants are usually worth claiming, because the heavy lifting, real consumption data and a standards-based design, is work a serious project needs anyway. PSDS and IETF are closed, so the practical routes today are BUS for small systems, GHNF for heat networks and capital allowances. The judgement call is which route fits and whether the timing works.

The way to settle it for your building is to model the actual numbers. Read the grants and funding routes in detail, work through the cost guide to see how funding nets off, run a first estimate through the savings calculator, and when you want a clear answer for your site, send an enquiry and we reply by email about the grant routes that fit. A good installer will tell you if a grant is not worth chasing.