Company lists · Data refreshed September 2026

Top 25 Geothermal installation companies based in the United Kingdom

Name: Geothermal installation 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 438 companies tracked

RevenueBase identified 438 geothermal installation companies headquartered in the United Kingdom as of September 2026 and tracks 2,742 professional contacts across them, including 968 with verified work emails. London is the largest hub.

This list covers geothermal installation 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

438Companies

2,742Contacts tracked

968Verified emails

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The 25 largest geothermal installation companies based in the United Kingdom

Ranked by team size

Top 25 of 438 geothermal installation 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 installation 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	Swale Heating Part Of Sureserve	Indirect evidence	Sittingbourne, United KingdomHQ checked Sep 20, 2026	201-500	136 contacts →
	Indirect evidence “As an established heating company based in Kent, Swale Heating are proud to offer expert guidance in choosing the best heating and boiler systems & products available today.” Source: RevenueBase Database · checked Sep 20, 2026
2	BOXT	Partial evidence	Leeds, United KingdomHQ checked Sep 20, 2026	51-200	116 contacts →
	Partial 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
3	Glow Green	Indirect evidence	Bournemouth, United KingdomHQ checked Sep 20, 2026	51-200	110 contacts →
	Indirect evidence “Glow Green is one of the UK's leading installers of Solar Panels, Battery Storage, Heat Pumps, Boilers, AC Units, & EV Chargers.” Source: RevenueBase Database · checked Sep 20, 2026
4	CPS Building Services LTD	Partial evidence	Cambridge, United KingdomHQ checked Sep 20, 2026	51-200	85 contacts →
	Partial 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
5	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
6	Nu-Heat Underfloor Heating & Renewables	Indirect evidence	Honiton, United KingdomHQ checked Sep 20, 2026	51-200	70 contacts →
	Indirect 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
7	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
8	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
9	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
10	Solmatix Renewables LTD	Indirect evidence	Dundrod Rd, United KingdomHQ checked Sep 20, 2026	11-50	41 contacts →
	Indirect evidence “Founded in 2008, Solmatix is one of the UK's and Ireland's leading renewable energy specialists, delivering innovative, high-quality energy solutions for commercial, industrial…” Source: RevenueBase Database · checked Sep 20, 2026
11	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
12	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
13	Quora Group	Indirect evidence	North Shields, United KingdomHQ checked Sep 20, 2026	51-200	33 contacts →
	Indirect evidence “Professional service supplying, installing and maintaining energy efficient HVAC systems.” Source: RevenueBase Database · checked Sep 20, 2026
14	Stiebel Eltron UK LTD	Indirect evidence	Bromborough, United KingdomHQ checked Sep 20, 2026	11-50	28 contacts →
	Indirect evidence “STIEBEL ELTRON UK is a leading manufacturer of premium heat pumps and renewable heating solutions, electric hot water and room heating and ventilation, supplying high-quality…” Source: RevenueBase Database · checked Sep 20, 2026
15	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
16	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
17	Rayotec LTD	Indirect evidence	Sunbury On Thames, United KingdomHQ checked Sep 20, 2026	11-50	22 contacts →
	Indirect evidence “Rayotec are specialists in renewable energy solutions.” Source: RevenueBase Database · checked Sep 20, 2026
18	Drilcorp	Indirect evidence	Seaham, United KingdomHQ checked Sep 20, 2026	11-50	21 contacts →
	Indirect evidence “Drilcorp was established in 1992 and since then has developed into one of the UK’s top drilling companies.” Source: RevenueBase Database · checked Sep 20, 2026
19	Macbrookgas LTD	Indirect evidence	Banham, United KingdomHQ checked Sep 20, 2026	51-200	19 contacts →
	Indirect evidence “MACBROOKGAS LTD is a heating and Insulation company based out of United Kingdom.” Source: RevenueBase Database · checked Sep 20, 2026
20	HEX Energy LTD	Indirect evidence	Nuneaton, United KingdomHQ checked Sep 20, 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 20, 2026
21	JET Environmental Systems LTD	Indirect evidence	Solihull, United KingdomHQ checked Sep 20, 2026	11-50	16 contacts →
	Indirect evidence “Jet Environmental designs, manufactures, installs and maintains heating, ventilation and cooling systems for large volume, industrial, commercial warehouses.” Source: RevenueBase Database · checked Sep 20, 2026
22	IMS Heat Pumps Limited	Indirect evidence	Perth, United KingdomHQ checked Sep 20, 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 20, 2026
23	Better Planet	Indirect evidence	Potters Bar, United KingdomHQ checked Sep 20, 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 20, 2026
24	Geothermal Engineering LTD	Partial evidence	Redruth, United KingdomHQ checked Sep 20, 2026	1-10	14 contacts →
	Partial evidence “GEL has brought the most experienced geothermal engineers together with leading industry partners to develop the UK's first large-scale geothermal energy plant in Cornwall.” Source: RevenueBase Database · checked Sep 20, 2026
25	Payne's Heating & Plumbing Services LTD	Indirect evidence	Uckfield, United KingdomHQ checked Sep 20, 2026	51-200	14 contacts →
	Indirect evidence “Paynes has been established since 1982, as plumbing and heating specialists.” 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 installation 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 installation companies.
Partial evidence: Its own public description names part of geothermal installation companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name geothermal installation 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 438 geothermal installation companies based in the United Kingdom

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Geothermal installation companies based in the United Kingdom at a glance

As of Sep 20, 2026

35.3%Verified-email coverage

6.3Average contacts per company

1-10Median size (employees)

7.3%Largest-city concentration · London

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

242

11-50

151

51-200

201-500

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 438 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 installation 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 installation 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 installation 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 installation 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, 968 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 installation companies by metro

Geothermal installation companies in London32

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 installation 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 installation companies are there based in the United Kingdom?

RevenueBase identified 438 geothermal installation 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?

Swale Heating Part Of Sureserve, headquartered in Sittingbourne, tops this list with the largest team on record.

Which city has the most geothermal installation companies?

London leads with 32 headquartered companies, followed by Bristol (6) and Glasgow (6).

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 968 verified decision-maker contacts tracked across these 438 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.