Commercial Heat Pumps: capacity, cost and efficiency

What a commercial heat pump is, and how it works

A heat pump moves heat rather than making it. Instead of burning gas, it uses a refrigerant circuit and a compressor to lift low-grade heat from the outside air (air-source), the ground (ground-source) or a water body (water-source) up to a useful temperature for heating and hot water. Because it moves several units of heat for every unit of electricity it draws, it can deliver heat at an efficiency well above 100 per cent — a seasonal coefficient of performance (SCOP) of typically 2.8 to 4.0 means three to four units of heat for each unit of electricity. That efficiency is the whole reason a heat pump can be the electrification step in a commercial building’s HVAC strategy without the running cost running away.

Commercial heat pumps come in a few forms. Air-source units, often cascaded in banks, are the common route and typically run from 40 to 500 kW thermal. Ground-source and water-source systems scale larger and run at higher, steadier efficiency but need boreholes or a water body. And in buildings that already have VRF or chillers, reversible and heat-recovery systems heat and cool from a single plant set — VRF-to-heat blurs the line between air conditioning and heating entirely, so the same plant that cools the sunny side of a building can heat the shaded side.

For buildings where heating is the whole story rather than one stage of a broader HVAC plan, our sibling site of dedicated commercial heat pump specialists covers air-source versus ground-source selection and heat-only design in more depth.

Where commercial heat pumps fit

The electrification step suits any building with a year-round or seasonal heating and hot-water demand that currently comes from gas or oil combustion:

• Offices — replacing gas boilers for space heating, often integrated with existing VRF cooling.
• Hotels — a large, steady heating and hot-water demand, ideal for a heat pump paired with buffer storage and MVHR on the leisure spaces.
• Care homes — continuous, comfort-critical heating where reliability and low flow-temperature emitters matter.
• Public buildings — schools, leisure centres and civic buildings with board or council net-zero targets driving the switch.

The best results come where the building can accept low flow temperatures (45–55°C), with upgraded emitters where needed and good ventilation heat recovery — which is exactly why efficient ventilation and MVHR come before electrifying heat. A heat pump forced to run at high flow temperatures into an unimproved building will have a poor SCOP and disappoint. Get the fabric and ventilation right first, and the heat pump runs efficiently.

Air-source, ground-source or water-source — choosing the type

Which type of heat pump a building should use is a site question as much as an energy one. Air-source heat pumps are the default for commercial retrofit because they need only external space for the units — a plant deck or compound — and no groundworks, so they are the fastest and least disruptive to install. Their efficiency dips a little in the coldest weather because the air they draw heat from is at its coldest exactly when demand peaks, which is why sizing and defrost strategy matter.

Ground-source systems draw heat from boreholes or ground loops at a stable temperature all year, so they hold a higher, steadier SCOP and suit buildings with the land or the drilling access and a long-term horizon — the higher capital and groundworks pay back over a long asset life. Water-source systems, where a river, lake or aquifer is available, offer similar stability. The choice weighs available space, ground conditions, capital budget and how long the building will be held. A good contractor assesses all three against the site and the heat demand rather than defaulting to one, and for a deeper comparison our sibling heat pumps for business premises specialists set out the trade-offs in detail.

The honest running-cost case — the number nobody else will give you straight

This is where most heat-pump pages go quiet, and where honesty builds trust. Electricity is currently around four times the unit price of gas — roughly 24–25p per kWh for electricity against 6–7p for gas on 2026 price caps (confirm the current caps on gov.uk). A heat pump only beats gas on running cost when its SCOP is good enough to close that gap.

The maths is straightforward. At a SCOP of around 3.5, a heat pump delivers a unit of useful heat for roughly 7p — level with, or a little below, a good gas boiler at around 8p today. But at the median field SCOP of 2.8–3.1 seen in real UK installations, a heat pump can be marginally more expensive to run than gas on today’s tariffs. That is the honest picture, and it is why the responsible line is: it depends on SCOP and tariff, and a good contractor models it from your real half-hourly data before you commit. A good contractor does not quote fabricated savings.

Two things move the maths in the heat pump’s favour over time: the Climate Change Levy and the continuing decarbonisation of the grid both shift the balance away from gas, and pairing the heat pump with solar to power it — the next step on the ladder — cuts the electricity it draws from the grid. Where the running-cost maths is genuinely marginal today, a good contractor will tell you, and often the right first move is efficiency (controls, EC fans, heat recovery) before the heat pump goes in. There are indicative ranges for every system type on our cost guide.

Sizing and economics

Heat pumps are sized on the building’s peak heat loss and its hot-water demand, not floor area. Air-source commercial systems typically run 40–500 kW thermal, delivering anywhere from 80,000 to over 1,000,000 kWh of heat a year and displacing 15 to 180 tonnes of CO2 depending on scale and what they replace. Plant decks take roughly 20–200 sqm. Project cost depends on capacity, buffer storage, emitter upgrades, controls and any electrical supply upgrade, so a figure comes from a design rather than a range. A staged or hybrid approach — the heat pump doing the bulk of the work with a retained peaking boiler — often makes the capital more affordable and the running cost more resilient than a single day-one switch.

The compliance angle — F-gas, performance standards and the grid

A heat pump contains refrigerant, so the circuit falls under F-gas rules: certified installation and servicing by an F-Gas registered company, and leak checks by charge. Performance is designed and quoted to BS EN 14511 (rated COP) and BS EN 14825 (SCOP) so figures are comparable across suppliers, with MCS or a recognised commercial QA route relevant up to 45 kWth on some paths.

The distinctive compliance issue for heat pumps is electrical supply. Electrifying heat adds significant load, and where a DNO supply upgrade is needed it is frequently the longest-lead item in the whole project — sometimes many months. Adding generation or large loads also triggers G99/G98 notification to the network operator. A good contractor confirms available supply capacity at the feasibility stage, because starting that conversation early is what stops the electrical supply becoming the thing that delays the install. On constrained sites a good contractor looks at phasing, demand management, or pairing the heat pump with on-site solar and battery storage.

The funding reality: BUS for small heat pumps, tax relief for the rest

Facilities managers frequently ask about the £7,500 grant. The honest answer is that the Boiler Upgrade Scheme covers heat pumps up to 45 kWth in homes and non-domestic buildings in England and Wales, so a small heat pump may qualify, but building-scale plant is above its size limit, and a good contractor would rather say that plainly than imply a grant that does not exist. Larger commercial heat-pump electrification is funded through the tax system instead:

• Annual Investment Allowance — up to £1m at 100 per cent for any business; the main route for most commercial HVAC spend.
• 50 per cent first-year allowance — for companies buying new special-rate assets, which covers most heating, ventilation and air-cooling plant (confirm the current position on gov.uk).

Eligible energy-intensive industrial and data-centre sites could historically use the Industrial Energy Transformation Fund, but it closed to new applications in July 2025 with no successor planned. You can read the capital allowances guidance, including full expensing for main-rate plant on GOV.UK, and our grants and funding page maps the routes that genuinely apply to your building.

Common objections, answered honestly

“Won’t a heat pump cost more to run than our gas boilers?” It depends on the SCOP and your tariff, and a good contractor models it from your real data. Electricity is around four times the price of gas, and a SCOP of 3.5 offsets most of that gap — a unit of heat lands roughly level with a good gas boiler today. At lower field SCOPs it can be marginally more expensive, which is why a good contractor designs for a low flow temperature and ventilation heat recovery, and tells you honestly where the maths is tight.

“There’s no grant like the £7,500 one, so there’s no funding for us.” The Boiler Upgrade Scheme only covers heat pumps up to 45 kWth, so it will not carry a building-scale project. But commercial buildings have capital allowances — the £1m Annual Investment Allowance and, for companies, a 50 per cent first-year allowance for special-rate plant — which turn heat-pump capital into tax relief. A good contractor maps the routes that apply to your business.

“Can we really run our whole building on a heat pump?” In most cases yes, best paired with low flow temperatures, upgraded emitters and good ventilation heat recovery. Where a full switch is not yet affordable or the supply is constrained, a hybrid keeps a peaking boiler while the heat pump does the bulk of the work. For heat-only buildings, our sibling heat pumps for business premises specialists cover the design choices in more depth.

Frequently asked questions

Can I replace my gas boilers with a commercial heat pump?

In most buildings, yes. Air-source or water-source heat pumps deliver heat at a SCOP of typically 2.8–4.0, removing on-site combustion. The best results come from low flow temperatures, upgraded emitters where needed and good ventilation heat recovery. Where a full switch is not yet affordable, a hybrid or staged approach keeps a peaking boiler while the heat pump does the bulk of the work.

Will a heat pump cost more to run than gas?

It depends on the SCOP and your tariff, and it should be modelled from your real consumption. Electricity is around four times the price of gas; at a SCOP of about 3.5 a unit of heat costs close to or slightly below a good gas boiler today, while at lower field SCOPs it can be marginally more. A good contractor models it from your data and tells you honestly where the maths is tight.

Is there a grant for a commercial heat pump?

Possibly, for a small system: the £7,500 Boiler Upgrade Scheme can fund a heat pump up to 45 kWth in a home or non-domestic building in England and Wales. Larger commercial heat-pump electrification is funded through the Annual Investment Allowance (100% on up to £1m a year) and, for companies, the 50% first-year allowance for special-rate assets — heating, ventilation and air-cooling plant is usually special-rate, so full expensing does not normally apply. Eligible industry could use the Industrial Energy Transformation Fund until it closed in July 2025.

Will a heat pump overload our electricity supply?

Possibly, so a good contractor checks early. Electrifying heat adds meaningful load, and a DNO supply upgrade — where one is needed — can be the longest-lead item in the project. A good contractor confirms capacity at feasibility and, on constrained sites, looks at phasing, demand management or pairing with solar and storage.

How does a heat pump fit with our cooling and ventilation?

It is the electrification step after efficient cooling and ventilation. VRF and reversible plant can heat and cool from one system, and good ventilation heat recovery is what lets the heat pump run at a low flow temperature and a good SCOP. A good contractor designs the whole building’s heating, cooling and ventilation together.

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A good contractor installs commercial heat pumps across the UK, including London, Manchester and Birmingham, as one step in a joined-up HVAC and electrification plan. For an honest, data-modelled feasibility study, request a quote, or read the most common commercial HVAC questions.