Commercial Heat Pump Grants in 2026: Full Guide

Commercial heat pump grants are the single most misunderstood part of decarbonising a non-domestic building, and that confusion costs organisations real money every year. The headline scheme almost everyone has heard of, the £7,500 Boiler Upgrade Scheme, is domestic-only and does not touch a commercial property. That one fact leaves a lot of facilities, estates and energy managers assuming there is no funding at all for a business heat pump. There is. It simply lives in a different set of schemes with different rules, and the work is to match your building, your sector and your tax position to the right route before you commit a penny of capital.

This guide lays out the commercial heat pump grants that actually apply in 2026, who qualifies for each, and how the application works in practice. It deliberately leads with the funding question, because the funding case and the engineering case are the same piece of work, and the right scheme often shapes the system you build.

Why there is no single commercial heat pump grant

It helps to clear the most common misconception first. The Boiler Upgrade Scheme (BUS) pays £7,500 toward an air-source or ground-source heat pump, but only in domestic properties in England and Wales up to 45 kW thermal. BUS terms and eligible technologies change over time, so check the current rates on gov.uk, but the core point holds: it is not available for commercial or non-domestic buildings, full stop. We mention it only because businesses ask about that £7,500 figure constantly, and the honest answer is that it will not apply to your premises.

Instead, commercial heat pump grants come from a handful of larger, sector-specific routes plus capital tax relief any business can use. Most commercial buildings qualify for at least one. The trick is knowing which, and designing the project so the funder’s criteria are met from day one.

The Public Sector Decarbonisation Scheme (PSDS)

If you are a public-sector body, this is usually the headline route. The Public Sector Decarbonisation Scheme, administered by Salix Finance for DESNZ, funds low-carbon heating and demand-reduction measures across NHS trusts, schools, colleges, universities, local authorities and emergency services. It takes a whole-building approach and pays the premium a heat pump carries over a like-for-like fossil-fuel replacement.

Capital grants range from tens of thousands of pounds to multi-million on the largest estates. The scheme runs in competitive application windows that are time-limited, so confirm current deadlines on gov.uk; early planning is essential, particularly where a grid supply upgrade is on the critical path. PSDS is public sector only; it does not fund private commercial buildings. If you run a school, a council leisure centre or an NHS site with an ageing gas boiler, this is the first door to knock on.

The Industrial Energy Transformation Fund (IETF)

For eligible industrial sites and data centres, the Industrial Energy Transformation Fund Phase 3 supports fuel-switching to industrial heat pumps and waste-heat recovery. It is open to sites in England, Wales and Northern Ireland in qualifying SIC codes, which now span manufacturing, recovery and recycling, data centres, and newer sectors including controlled-environment horticulture, industrial laundries and textile renting.

IETF terms (grant rates, minimum grant sizes, technology-readiness requirements and eligibility windows) vary by funding round, so check the current scheme guidance on gov.uk before you plan a bid. Modern commercial heat pumps comfortably meet the maturity bar these funds expect. IETF is aimed squarely at large-scale industrial and process heat, not ordinary office heating, so it suits a manufacturer, a food producer or a laundry raising process hot water rather than a typical commercial landlord. Our industrial and process heat pump work is built around exactly this kind of fuel-switching case.

The Green Heat Network Fund (GHNF)

Where the project serves more than one building, the Green Heat Network Fund is the route to look at. It is open to public, private and third-sector bodies in England developing new low-carbon heat networks, or retrofitting and expanding existing ones, using heat pumps, geothermal, water-source or waste heat. The grant can cover a substantial share of eligible commercialisation and construction costs, and individual awards regularly run to several million pounds per scheme. The exact grant rates, minimums and eligibility windows vary by funding round, so check the current scheme guidance on gov.uk.

GHNF runs in time-limited funding rounds, so confirm current deadlines on gov.uk. It suits universities, hospitals, councils and large mixed-use developments rather than single buildings, and it sits alongside the wider move to bring heat networks under Ofgem regulation. If your site is a campus or a cluster of buildings that could share a central low-carbon energy centre, this is where the larger money lives.

Capital allowances: full expensing and the AIA

The route that applies to almost every business, and the one most often overlooked, is capital tax relief. Because heat pumps count as plant and machinery, full expensing lets a company within UK corporation tax deduct 100% of new, unused qualifying kit in the first year. It is uncapped. At the 25% corporation-tax rate that is worth up to 25p of tax saved for every pound spent. For a private commercial building with no access to PSDS or IETF, this is frequently the single most valuable lever available.

Full expensing is for companies only. Sole traders and partnerships use the Annual Investment Allowance instead, which relieves up to £1m of qualifying spend at 100%. Some ancillary wiring and works can fall outside full expensing yet still qualify for the AIA, so the two often work together. The crucial point: a grant and capital allowances are not mutually exclusive. A PSDS, IETF or GHNF award can meet a share of the capital while full expensing or the AIA reduces the after-tax cost of what remains. Always confirm the exact treatment with your accountant, but plan the project knowing both levers exist.

How to apply, and how to make the bid stand up

Funding follows credible numbers, so the grant application and the system design are built in parallel, not in sequence. The process that works looks like this.

Start with real consumption data

We begin with your half-hourly meter data and at least 12 months of gas or oil consumption, never floor area. A competitive grant application and an honest business case both live or die on real demand data, and a funder will scrutinise the assumptions behind your savings claim.

Map the schemes you qualify for

Next, we work out which routes apply, public or private, single building or campus, and how a capital grant stacks with full expensing or the AIA. This is where most of the value sits, because the answer is rarely just one scheme.

Design to the standards a funder expects

The system is then specified to recognised standards, BS EN 14825 for SCOP and BS EN 14511 for rated COP, so the performance figures in the bid are directly comparable to any compliant supplier. For systems up to 45 kW thermal, MCS certification or a recognised commercial equivalent is required to access most grant routes; above that we design to CIBSE and BSRIA standards. We get the DNO grid enquiry in early so the longest-lead item does not derail a fixed grant deadline.

Submit around the scheme, not the other way round

Finally, the application is built around the funder’s rules and deadlines, with the engineering case attached as evidence. You receive a fixed-price proposal with running cost and carbon modelled from your own data, and a clear statement of which grant or tax route the project is designed to qualify for.

What the numbers can look like (illustrative)

As an illustrative composite, and not a real named client: a council-owned leisure centre with a year-round heating load on an end-of-life gas boiler secured PSDS funding for a 450 kW ground-source heat pump, delivering around 1,050,000 kWh of heat a year at an SCOP near 4.1 and saving roughly 190 tonnes of CO2 annually. Most of the capital sitting above what a like-for-like boiler swap would have cost was met by the grant, so conventional payback was not the relevant measure for the council. The figures are illustrative and depend on your building, your sector eligibility and the scheme rules in force at the time.

Your next step

The right first move is to find out which funding you qualify for, then design around it. Work through the grants and funding routes in detail, review the full cost guide to see how grants net off against installed cost, model your own figures with the savings calculator, and when you are ready, request a free feasibility built from your meter data and mapped to the commercial heat pump grants your building actually qualifies for.