Company lists · Data refreshed September 2026

Top 25 Geothermal system companies based in the United Kingdom

Name: Geothermal system companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 599 companies tracked

RevenueBase identified 599 geothermal system companies headquartered in the United Kingdom as of September 2026 and tracks 5,149 professional contacts across them, including 1,637 with verified work emails. London is the largest hub.

This list covers geothermal system companies 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 20, 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 20, 2026 86% judged on-target in blind review

599Companies

5,149Contacts tracked

1,637Verified emails

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The 25 largest geothermal system companies based in the United Kingdom

Ranked by team size

Top 25 of 599 geothermal system companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to geothermal system companies: 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	Indirect evidence	Warwick, United KingdomHQ checked Sep 20, 2026	1,001-5,000	850 contacts →
	Indirect 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 20, 2026
2	Vaillant UK	Indirect evidence	Belper, United KingdomHQ checked Sep 20, 2026	501-1,000	179 contacts →
	Indirect evidence “What does it take to deliver confidence at every stage of the heating journey?” Source: RevenueBase Database · checked Sep 20, 2026
3	Swegon Uk&i	Partial evidence	Ashby-de-la-zouch, United KingdomHQ checked Sep 20, 2026	501-1,000	156 contacts →
	Partial evidence “Swegon is a market leading supplier of energy efficient indoor climate, cooling and life safety systems.” Source: RevenueBase Database · checked Sep 20, 2026
4	Bring Energy	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	125 contacts →
	Indirect evidence “We are Bring Energy.” Source: RevenueBase Database · checked Sep 20, 2026
5	BOXT	Indirect evidence	Leeds, United KingdomHQ checked Sep 20, 2026	51-200	116 contacts →
	Indirect evidence “We started out as a trailblazing boiler installation company in 2017 – the first to offer everything effortlessly online.” Source: RevenueBase Database · checked Sep 20, 2026
6	AES	Indirect evidence	Enfield, United KingdomHQ checked Sep 20, 2026	201-500	112 contacts →
	Indirect evidence “As renewable energy technology experts, we have the knowledge and skills to help commercial clients switch to a greener, lower cost and more independent energy source.” Source: RevenueBase Database · checked Sep 20, 2026
7	CPS Building Services LTD	Indirect evidence	Cambridge, United KingdomHQ checked Sep 20, 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 20, 2026
8	Purdy Part Of Sureserve	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	201-500	85 contacts →
	Indirect evidence “Who are we?” Source: RevenueBase Database · checked Sep 20, 2026
9	Star Energy Group PLC	Indirect evidence	Sudbrooke, United KingdomHQ checked Sep 20, 2026	51-200	83 contacts →
	Indirect evidence “Star Energy Group plc is a British energy business.” Source: RevenueBase Database · checked Sep 20, 2026
10	Nu-Heat Underfloor Heating & Renewables	Partial evidence	Honiton, United KingdomHQ checked Sep 20, 2026	51-200	70 contacts →
	Partial evidence “As the UK's largest supplier of warm water underfloor heating and integrated renewables, Nu‑Heat delivers fully designed, energy efficient systems to installers, housebuilders…” Source: RevenueBase Database · checked Sep 20, 2026
11	Rendesco	Indirect evidence	London, United KingdomHQ checked Sep 20, 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 20, 2026
12	Ecolution Group	Indirect evidence	Trottiscliffe, United KingdomHQ checked Sep 20, 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 20, 2026
13	Cooltherm	Indirect evidence	Bridgeyate, United KingdomHQ checked Sep 20, 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 20, 2026
14	Heatforce	Indirect evidence	Cardiff, United KingdomHQ checked Sep 20, 2026	51-200	53 contacts →
	Indirect evidence “Heatforce has evolved through word of mouth and customer recommendations, growing into a company that now employs 120 dedicated staff with 40 years of expertise.” Source: RevenueBase Database · checked Sep 20, 2026
15	B-Engineering Group Certified B Corp	Indirect evidence	Warrington, United KingdomHQ checked Sep 20, 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 20, 2026
16	Pure Renewables	Indirect evidence	Hull, United KingdomHQ checked Sep 20, 2026	11-50	37 contacts →
	Indirect evidence “As commercial and industrial heat pump and solar PV specialists, Pure Renewables are here to help you invest in your energy future.” Source: RevenueBase Database · checked Sep 20, 2026
17	Sungift Solar	Indirect evidence	Exeter, United KingdomHQ checked Sep 20, 2026	51-200	35 contacts →
	Indirect evidence “SunGift Solar are an award-winning renewable energy company, founded in 2005.” Source: RevenueBase Database · checked Sep 20, 2026
18	Quora Group	Partial evidence	North Shields, United KingdomHQ checked Sep 20, 2026	51-200	33 contacts →
	Partial evidence “Professional service supplying, installing and maintaining energy efficient HVAC systems.” Source: RevenueBase Database · checked Sep 20, 2026
19	Artus AIR	Indirect evidence	London, United KingdomHQ checked Sep 20, 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 20, 2026
20	Oakland AIR Control	Indirect evidence	Worcester, United KingdomHQ checked Sep 20, 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 20, 2026
21	Myriad Heat And Power Products	Partial evidence	Melton Mowbray, United KingdomHQ checked Sep 20, 2026	11-50	30 contacts →
	Partial 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 20, 2026
22	Oceanair UK LTD	Indirect evidence	Mansfield, United KingdomHQ checked Sep 20, 2026	11-50	28 contacts →
	Indirect evidence “Oceanair is an award-winning distributor of air conditioning and heating products.” Source: RevenueBase Database · checked Sep 20, 2026
23	Geothermal Development Company	Partial evidence	Great Yarmouth, United KingdomHQ checked Sep 20, 2026	11-50	28 contacts →
	Partial evidence “CeraPhi Energy is a leading project development company delivering global geothermal energy solutions at scale.” Source: RevenueBase Database · checked Sep 20, 2026
24	M&n Heating & Plumbing	Indirect evidence	Banbury, United KingdomHQ checked Sep 20, 2026	51-200	26 contacts →
	Indirect evidence “M&N Heating & Plumbing is an independent company based in Bloxham on the edge of Banbury, serving Oxfordshire, Northamptonshire, Buckinghamshire and Warwickshire.” Source: RevenueBase Database · checked Sep 20, 2026
25	Jaga UK	Indirect evidence	Ledbury, United KingdomHQ checked Sep 20, 2026	11-50	24 contacts →
	Indirect evidence “Ensuring a better indoor climate without damaging the outdoor climate.” Source: RevenueBase Database · checked Sep 20, 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: geothermal system companies. 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 geothermal system companies.
Partial evidence: Its own public description names part of geothermal system companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name geothermal system companies. 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 599 geothermal system companies based in the United Kingdom

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Geothermal system companies based in the United Kingdom at a glance

As of Sep 20, 2026

31.8%Verified-email coverage

8.6Average contacts per company

1-10Median size (employees)

7.2%Largest-city concentration · London

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

298

11-50

234

51-200

201-500

501-1,000

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 599 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 geothermal system companies, 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 “geothermal system companies”. 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 geothermal system companies), 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 geothermal system companies, 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, 1,637 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 20, 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.

Geothermal system companies by metro

Geothermal system companies in London43

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 geothermal system companies, 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 geothermal system companies are there based in the United Kingdom?

RevenueBase identified 599 geothermal system companies 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 geothermal system companies?

London leads with 43 headquartered companies, followed by Bristol (8) and Leeds (8).

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 1,637 verified decision-maker contacts tracked across these 599 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 20, 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.