Company lists · Data refreshed September 2026

Top 25 Commercial geothermal installers based in the United Kingdom

Name: Commercial geothermal installers based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 352 companies tracked

RevenueBase identified 352 commercial geothermal installers headquartered in the United Kingdom as of September 2026 and tracks 2,939 professional contacts across them, including 917 with verified work emails. London is the largest hub.

This list covers commercial geothermal installers headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 19, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 19, 2026 86% judged on-target in blind review

352Companies

2,939Contacts tracked

917Verified emails

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The 25 largest commercial geothermal installers based in the United Kingdom

Ranked by team size

Top 25 of 352 commercial geothermal installers based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to commercial geothermal installers: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	BAXI	Partial evidence	Warwick, United KingdomHQ checked Sep 19, 2026	1,001-5,000	850 contacts →
	Partial evidence “We're leading the energy transition to zero carbon, by offering complete residential and commercial heating and hot water solutions.” Source: RevenueBase Database · checked Sep 19, 2026
2	CPS Building Services LTD	Indirect evidence	Cambridge, United KingdomHQ checked Sep 19, 2026	51-200	85 contacts →
	Indirect evidence “CPS Building Services Ltd are experts in design, installation and maintenance of all mechanical and electrical services including renewables.” Source: RevenueBase Database · checked Sep 19, 2026
3	Rendesco	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	60 contacts →
	Indirect evidence “Rendesco is the UK’s leading clean energy tech developer and operator, focusing on the electrification of heat using heat pumps and heat networks to decarbonise Britain’s…” Source: RevenueBase Database · checked Sep 19, 2026
4	Ecolution Group	Indirect evidence	Trottiscliffe, United KingdomHQ checked Sep 19, 2026	51-200	55 contacts →
	Indirect evidence “Renewable Energy Experts: For over 25 years, Ecolution have been at the forefront of renewable energy services, using our award-winning expertise, to help our clients innovate and…” Source: RevenueBase Database · checked Sep 19, 2026
5	Cooltherm	Indirect evidence	Bridgeyate, United KingdomHQ checked Sep 19, 2026	51-200	54 contacts →
	Indirect evidence “With over 30 years of expertise, Cooltherm delivers sustainable HVAC solutions across healthcare, education, construction, data centres, factories & manufacturing, and warehouse &…” Source: RevenueBase Database · checked Sep 19, 2026
6	B-Engineering Group Certified B Corp	Indirect evidence	Warrington, United KingdomHQ checked Sep 19, 2026	51-200	39 contacts →
	Indirect evidence “We are a purpose driven engineering business, passionate about our people and the environment.” Source: RevenueBase Database · checked Sep 19, 2026
7	Quora Group	Indirect evidence	North Shields, United KingdomHQ checked Sep 19, 2026	51-200	33 contacts →
	Indirect evidence “Professional service supplying, installing and maintaining energy efficient HVAC systems.” Source: RevenueBase Database · checked Sep 19, 2026
8	Artus AIR	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	31 contacts →
	Indirect evidence “Artus Air is an Air Tech company dedicated to improving the way buildings are cooled and heated, globally by reducing carbon impact and improving the comfort of occupants.” Source: RevenueBase Database · checked Sep 19, 2026
9	REINA	Indirect evidence	Folkestone, United KingdomHQ checked Sep 19, 2026	51-200	30 contacts →
	Indirect evidence “The Reina Group was founded in 2003 and through our core company values, expertise and impassioned commitment to provide the best renewable, sustainable, viable and efficient…” Source: RevenueBase Database · checked Sep 19, 2026
10	Oakland AIR Control	Indirect evidence	Worcester, United KingdomHQ checked Sep 19, 2026	11-50	30 contacts →
	Indirect evidence “We are a specialist heating, ventilation, air conditioning (HVAC), heat pump, electrical and BEMS controls engineering solutions business and post ESOS service provider.” Source: RevenueBase Database · checked Sep 19, 2026
11	Myriad Heat And Power Products	Indirect evidence	Melton Mowbray, United KingdomHQ checked Sep 19, 2026	11-50	30 contacts →
	Indirect evidence “We know about Low carbon heat and power Award Winning Low Carbon system Design / Installation / Servicing If you have a need save energy cost or carbon, regardless of your…” Source: RevenueBase Database · checked Sep 19, 2026
12	Jaga UK	Indirect evidence	Ledbury, United KingdomHQ checked Sep 19, 2026	11-50	24 contacts →
	Indirect evidence “Ensuring a better indoor climate without damaging the outdoor climate.” Source: RevenueBase Database · checked Sep 19, 2026
13	Aircon Services	Indirect evidence	Princes Risborough, United KingdomHQ checked Sep 19, 2026	11-50	24 contacts →
	Indirect evidence “At Aircon Services, we’ve been helping companies reduce their energy costs whilst ensuring their businesses are kept cool for over 30 years.” Source: RevenueBase Database · checked Sep 19, 2026
14	MCL Energy LTD	Indirect evidence	Doncaster, United KingdomHQ checked Sep 19, 2026	11-50	21 contacts →
	Indirect evidence “MCL Energy has been providing innovative site energy solutions for almost three decades to many different sectors but with one common goal – to provide competent, cost-effective…” Source: RevenueBase Database · checked Sep 19, 2026
15	Link365 Mechanical, Electrical & Renewable Energy Solutions	Indirect evidence	Essex, United KingdomHQ checked Sep 19, 2026	51-200	21 contacts →
	Indirect evidence “We provide Complete Mechanical, Electrical and Renewable Energy Solutions.” Source: RevenueBase Database · checked Sep 19, 2026
16	HEX Energy LTD	Indirect evidence	Nuneaton, United KingdomHQ checked Sep 19, 2026	11-50	17 contacts →
	Indirect evidence “Our aim is to provide renewable energy systems for properties that would clearly benefit from them.” Source: RevenueBase Database · checked Sep 19, 2026
17	Cleanheat	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	17 contacts →
	Partial evidence “CleanHeat are a London based Commercial Heating and engineering company working throughout central London and the Home Counties.” Source: RevenueBase Database · checked Sep 19, 2026
18	Home & Industrial Heating Services Limited	Indirect evidence	Eastleigh, United KingdomHQ checked Sep 19, 2026	11-50	17 contacts →
	Indirect evidence “H&I (Home & Industrial) Heating was established in 1972 as a sole trader/partnership for the Heating Industry.” Source: RevenueBase Database · checked Sep 19, 2026
19	JET Environmental Systems LTD	Partial evidence	Solihull, United KingdomHQ checked Sep 19, 2026	11-50	16 contacts →
	Partial evidence “Jet Environmental designs, manufactures, installs and maintains heating, ventilation and cooling systems for large volume, industrial, commercial warehouses.” Source: RevenueBase Database · checked Sep 19, 2026
20	Ensys AIR Conditioning Installation And Service	Indirect evidence	Thatcham, United KingdomHQ checked Sep 19, 2026	11-50	16 contacts →
	Indirect evidence “Ensys Ltd, UK based in Berkshire, Surrey, Warrington and Cheshire are air conditioning installation & service engineers.” Source: RevenueBase Database · checked Sep 19, 2026
21	Envira-Mech Services LTD	Indirect evidence	Clevedon, United KingdomHQ checked Sep 19, 2026	11-50	15 contacts →
	Indirect evidence “Envira-Mech Services' Vision: To create Sustainable Working environments for tomorrow by saving energy and de-carbonising Mechanical and Air Conditioning Services.” Source: RevenueBase Database · checked Sep 19, 2026
22	IMS Heat Pumps Limited	Indirect evidence	Perth, United KingdomHQ checked Sep 19, 2026	11-50	15 contacts →
	Indirect evidence “IMS Heat Pumps designs and installs air source, ground source and water source heat pump systems for self-build, renovation, retrofit, custom-build and new-build projects across…” Source: RevenueBase Database · checked Sep 19, 2026
23	Aniron Renewables	Partial evidence	Northampton, United KingdomHQ checked Sep 19, 2026	11-50	15 contacts →
	Partial evidence “Aniron Renewables delivers commercial and industrial-scale solar PV & BESS systems, taking projects from concept through to construction & O&M.” Source: RevenueBase Database · checked Sep 19, 2026
24	Climate Energy Group	Indirect evidence	Crewe, United KingdomHQ checked Sep 19, 2026	11-50	14 contacts →
	Indirect evidence “As one of the UK’s leading providers of energy-saving systems, we specialise in helping organisations to reduce their carbon footprint and save money, by installing unique…” Source: RevenueBase Database · checked Sep 19, 2026
25	Better Planet	Indirect evidence	Potters Bar, United KingdomHQ checked Sep 19, 2026	11-50	14 contacts →
	Indirect evidence “Better Planet was founded in 2004 with a vision to make it easier and more affordable to use green alternatives for heating and electricity.” Source: RevenueBase Database · checked Sep 19, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: commercial geothermal installers. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names commercial geothermal installers.
Partial evidence: Its own public description names part of commercial geothermal installers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name commercial geothermal installers. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 352 commercial geothermal installers based in the United Kingdom

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Commercial geothermal installers based in the United Kingdom at a glance

As of Sep 19, 2026

31.2%Verified-email coverage

8.3Average contacts per company

1-10Median size (employees)

8.8%Largest-city concentration · London

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

177

11-50

147

51-200

201-500

1,001-5,000

10001+

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 352 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among commercial geothermal installers, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United Kingdom whose own description of what they do matches “commercial geothermal installers”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names commercial geothermal installers), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among commercial geothermal installers, and records with no verified work email. Companies headquartered outside United Kingdom are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 917 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 19, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Commercial geothermal installers by metro

Commercial geothermal installers in London31

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names commercial geothermal installers, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many commercial geothermal installers are there based in the United Kingdom?

RevenueBase identified 352 commercial geothermal installers headquartered in the United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

BAXI, headquartered in Warwick, tops this list with the largest team on record.

Which city has the most commercial geothermal installers?

London leads with 31 headquartered companies, followed by Leeds (6) and Bristol (5).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 917 verified decision-maker contacts tracked across these 352 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 19, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.