Best Heat Pump Installers in the UK: How to Shortlist and Vet One

Anyone searching for the best heat pump installers in the UK is really asking who they can trust with a large, expensive and long-lived piece of plant. A ranked list on a website is a poor answer: most are advertising, and none of them has seen your building. This guide is a method instead. It shows how to build a list from registers you can verify, how to filter for firms that can handle a commercial job, and how to score them on the same criteria so the decision can be defended to a board or a finance director. It covers commercial heat pump installers for offices, care homes, schools, hotels and light industrial sites, and it names no firm, because this site is a guide and does not rank or recommend installers.

Why a best installers list is the wrong tool

A league table can only rank what it can measure, and the things that decide a commercial heat pump outcome are not public: the quality of the survey, the honesty of the efficiency figure, how the plant is staged, whether the supply and acoustic questions were settled before the price was fixed. A firm can be excellent for a three-bedroom house and unsuited to a 200 kW plant room, and the reverse. What can be checked is a short list of facts, and those are the basis for everything below.

Step 1: build the long list from registers, not adverts

Start with sources that publish an entry you can look up, and treat a logo on a website as no evidence at all:

• The MCS directory. MCS describes itself as the quality mark for small-scale renewables such as heat pumps, and its Find an Installer directory lets you check a business and confirm it is certified for the specific technology you want. Each listing shows a certification number and a certification body.
• F-Gas certification. A company handling refrigerant for others needs company certification from an approved body, and each engineer needs a personal qualification. Ask for both and check them with the issuing body.
• NICEIC or NAPIT registration for the electrical work, and Gas Safe registration where a gas boiler is retained.
• Company records. Check the legal entity on the quote is the one that holds the certificates, and that it has a filing history that matches what it says about how long it has traded.

The MCS check matters for money as well as quality. For the Boiler Upgrade Scheme, gov.uk tells applicants to contact MCS certified installers for quotes, and the installer applies on the property owner’s behalf. The Boiler Upgrade Scheme (England and Wales) can be used for a building used for a business, not only a home: it pays £7,500 towards an air source or ground source heat pump that replaces a fossil-fuel heating system, within DESNZ capacity caps (45 kWth for a single system), and hybrid systems are excluded.

Step 2: filter for commercial capability

Many heat pump firms are built around volume domestic installations. A commercial job is different in kind: a cascaded plant set, a heat-loss survey against twelve months of half-hourly data, an emitter and flow-temperature strategy, a distribution network operator (DNO) supply check, BS 4142 acoustics and a funding position that only partly overlaps with the domestic grant. Ask each firm to describe the last three jobs of comparable size and what was different about them, then ask for contact details for those clients and ring them. A firm that cannot put you in touch with a comparable client has told you something.

Also ask who does the design. A tender where the person who surveyed the building is not the person who designed the system is a tender where the details get lost. And ask whether drilling, electrical or controls work is subcontracted, and to whom, because every subcontractor is another certificate to check.

Step 3: score the shortlist on the same criteria

The weights are a starting point and should be changed to suit the building. A site with a hard shutdown window might weight the programme higher; a site with neighbours close by might weight acoustics higher. The point of the sheet is that every firm is marked on the same rows before anyone sees the prices.

Step 4: questions for the first call

• Which standard is the efficiency figure measured to, and at what flow temperature?
• Which emitters will need replacing, and is that in the price?
• When do you check the DNO supply, and what if an upgrade is needed?
• Which of your certificate numbers can I look up today?
• Who designs the system, and who is on site during commissioning?
• How will the changeover be planned so the building keeps its heat?

When the best installer is not the cheapest

At that scale the difference between a good and a poor design is the seasonal efficiency the plant delivers for two decades. A design that holds the flow temperature at 45 to 55C where the emitters allow will land near the top of the 3.0 to 4.0 SCOP range for air source; a design that leaves old high-temperature radiators in place and hopes for the best will not. The cheaper quote that skips the emitter survey is often the more expensive choice.

Check the funding position independently

Do not rely on an installer’s summary of the grants. The Boiler Upgrade Scheme (England and Wales) can be used for a building used for a business, not only a home: it pays £7,500 towards an air source or ground source heat pump that replaces a fossil-fuel heating system, within DESNZ capacity caps (45 kWth for a single system), and hybrid systems are excluded. Larger plant falls outside those caps. The Public Sector Decarbonisation Scheme has had no open application window since Phase 4 closed in November 2024, and gov.uk lists no further phase. The Industrial Energy Transformation Fund closed in July 2025 and gov.uk states that no successor fund is planned. The Green Heat Network Fund runs in application rounds: Round 12 closed on 25 September 2026, so check gov.uk for the next round. Tax relief works differently from what many guides say: a heat pump is part of a space or water heating system, which HMRC lists as an integral feature (special-rate plant), and full expensing covers main-rate plant only. The Annual Investment Allowance gives 100% relief up to its limit (£1 million), and companies can then claim a 50% first-year allowance on special-rate plant, with a 6% writing-down allowance on the rest. Confirm the treatment with an accountant. See the grants and funding page for the current status of each route.

For the detailed credential checks, read how to check an MCS heat pump installer. For turning a shortlist into a decision, the quote comparison and tender checklist has a scoring sheet. When you want a neutral first view of your own building, the brief request works from your meter data with no obligation. A printable version of the screening questions is the installer checklist, and a UK-wide overview of the registers is in heat pump installers in the UK.

Is there an official list of the best heat pump installers in the UK?

No. There is no official ranking. The MCS directory lets you check that a business is certified for a specific technology and shows its certification number and certification body, but it does not rank firms. Compare firms on verifiable criteria instead.

How many quotes should I get for a commercial heat pump?

Enough to compare on the same basis, and three is a common aim. What matters more than the number is that each quote starts from the same data: a heat-loss survey, twelve months of consumption and an emitter survey.

Do commercial heat pump installers need MCS certification?

For the Boiler Upgrade Scheme, gov.uk directs applicants to MCS certified installers. For larger commercial plant that is outside the scheme caps, MCS is still a useful check for the smaller systems it covers, and the design standards above that size should be asked about directly.

What should I look for in a heat pump installer reference?

A client with a building of comparable size and use, who can say how the survey, the programme and the commissioning went and what the running cost has been since. Ring them rather than relying on a testimonial.