Commercial heat pump myths vs facts
For how commercial plant differs from home systems, see commercial heat pump vs domestic; for part-replacement designs, see the hybrid heat pump guide.
| Myth | The fact | Verdict |
|---|---|---|
| Heat pumps do not work in a cold UK winter. | Air-source output does dip as it gets colder, which is a real design factor — so plant is sized for the peak and, where needed, paired with a peaking source for the rare extreme days. Ground and water-source draw from a stable source and barely move with air temperature. A properly sized, commissioned system holds temperature on the coldest morning; a badly sized one trips to backup. It is an engineering question, not a fundamental limit. | Concede + handle |
| You have to rip out every radiator and all the pipework. | Usually not. The emitters are surveyed first and the design is set to the lowest workable flow temperature. Many commercial systems run at 50-55 °C with selective radiator upgrades, and where high temperatures are genuinely needed a high-temperature or hybrid design avoids a full strip-out while still cutting carbon 70-90%. | Myth |
| A heat pump always costs more to run than a gas boiler. | Not when it is designed well. Electricity costs more per unit than gas, but a good SCOP of 3.0-4.0 delivers three to four units of heat per unit of electricity, offsetting most of the gap. At a low flow temperature and on a sensible tariff, well-designed commercial systems are at or below gas running cost — and the gap improves as gas carbon levies rise and the grid decarbonises. It should be modelled from real data rather than promised. | Discredit oversimplification |
| Businesses cannot get the £7,500 Boiler Upgrade Scheme grant. | Not quite. The Boiler Upgrade Scheme (England and Wales) covers non-domestic buildings as well as homes, so a small business building can qualify, but it is a flat grant per installation up to 45 kWth and does not scale to building-scale plant; confirm eligibility with Ofgem. Larger commercial and public-sector buildings use different, often larger, routes, and the grant schemes change: PSDS has had no open window since Phase 4 closed in November 2024, so check gov.uk for the status of any scheme. Annual Investment Allowance capital tax relief is the dependable route. | Myth |
| A commercial heat pump gets 0% VAT like a home installation. | No. The 0% VAT relief applies only to residential accommodation and relevant-charitable buildings, and reverts to 5% on 1 April 2027. General commercial premises do not qualify — the commercial route is capital allowances (Annual Investment Allowance on qualifying integral-feature plant), not zero-rated VAT. | Myth |
| It pays back in a few years — the numbers are amazing. | Inflated. Payback depends on the building’s consumption, the tariff, any emitter upgrades and the DNO supply cost, and it improves where capital allowances or a grant meet the capital. Anyone quoting a very short payback is probably leaning on best-case tariffs and ignoring emitter upgrades or a DNO supply cost. A sound case is modelled from consumption data and shows the full installed cost before any commitment. | Discredit inflated claim |
| Any heating engineer can install a commercial heat pump. | Partly true, partly not. Many can fit the unit; far fewer can deliver the heat-loss survey, the flow-temperature and emitter design, the DNO supply check, the BS 4142 acoustic assessment, the F-Gas refrigerant work and a commissioning witnessed by the client to BS EN 14825. Ask to see a commissioning pack from a comparable commercial job. | Concede + clarify |
Under-promising is better than over-promising. If you have heard a claim about commercial heat pumps that sounds too good — a three-year payback, a same-week install, zero-rated VAT on an office — check it against a proper heat-loss survey and your electrical supply position before you commit. Read our honest view on whether it is worth it.