Company lists · Data refreshed September 2026

Top 25 Geothermal equipment manufacturers based in the United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 65 companies tracked

RevenueBase identified 65 geothermal equipment manufacturers headquartered in the United Kingdom as of September 2026 and tracks 755 professional contacts across them, including 212 with verified work emails. London is the largest hub.

This list covers geothermal equipment manufacturers 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 16, 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 16, 2026 86% judged on-target in blind review

65Companies

755Contacts tracked

212Verified emails

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The 25 largest geothermal equipment manufacturers based in the United Kingdom

Ranked by team size

Top 25 of 65 geothermal equipment manufacturers based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to geothermal equipment manufacturers: 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	Vaillant UK	Indirect evidence	Belper, United KingdomHQ checked Sep 16, 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 16, 2026
2	Rendesco	Indirect evidence	London, United KingdomHQ checked Sep 16, 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 16, 2026
3	Cooltherm	Indirect evidence	Bridgeyate, United KingdomHQ checked Sep 16, 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 16, 2026
4	Lochinvar, UK	Partial evidence	Banbury, United KingdomHQ checked Sep 16, 2026	11-50	40 contacts →
	Partial evidence “Lochinvar designs, manufactures and distributes a comprehensive range of high efficiency gas fired water heaters and boilers for commercial and industrial applications.” Source: RevenueBase Database · checked Sep 16, 2026
5	Oceanair UK LTD	Indirect evidence	Mansfield, United KingdomHQ checked Sep 16, 2026	11-50	28 contacts →
	Indirect evidence “Oceanair is an award-winning distributor of air conditioning and heating products.” Source: RevenueBase Database · checked Sep 16, 2026
6	Stiebel Eltron UK LTD	Partial evidence	Bromborough, United KingdomHQ checked Sep 16, 2026	11-50	28 contacts →
	Partial 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 16, 2026
7	Jaga UK	Indirect evidence	Ledbury, United KingdomHQ checked Sep 16, 2026	11-50	24 contacts →
	Indirect evidence “Ensuring a better indoor climate without damaging the outdoor climate.” Source: RevenueBase Database · checked Sep 16, 2026
8	Schwank UK	Indirect evidence	Doncaster, United KingdomHQ checked Sep 16, 2026	11-50	17 contacts →
	Indirect evidence “The Schwank Group.” Source: RevenueBase Database · checked Sep 16, 2026
9	Townrock Energy	Partial evidence	Edinburgh City, United KingdomHQ checked Sep 16, 2026	11-50	14 contacts →
	Partial evidence “We are an award-winning geothermal company based in Edinburgh, Scotland and a leading specialist in all aspects of the UK’s geothermal resources.” Source: RevenueBase Database · checked Sep 16, 2026
10	Synergy Boreholes LTD	Partial evidence	Aylesbury, United KingdomHQ checked Sep 16, 2026	11-50	14 contacts →
	Partial evidence “We specialise in Geothermal Ground Source Boreholes and Water Boreholes up to 300m.” Source: RevenueBase Database · checked Sep 16, 2026
11	Clade Engineering Systems B Corp Certified	Indirect evidence	Leeds, United KingdomHQ checked Sep 16, 2026	51-200	13 contacts →
	Indirect evidence “At Clade we lead, we don’t follow.” Source: RevenueBase Database · checked Sep 16, 2026
12	Omnie Underfloor Heating, Heat Pumps & Ventilation	Partial evidence	Exeter, United KingdomHQ checked Sep 16, 2026	51-200	10 contacts →
	Partial evidence “OMNIE design and manufacture high performance underfloor heating systems as well as whole house technologies such as ventilation and heat pumps.” Source: RevenueBase Database · checked Sep 16, 2026
13	The Energy LAB UK	Partial evidence	Barnstaple, United KingdomHQ checked Sep 16, 2026	1-10	9 contacts →
	Partial evidence “Energy Lab has been supporting specifiers, developers and installers of geothermal and air source heat pumps since 2012.” Source: RevenueBase Database · checked Sep 16, 2026
14	Erda Energy	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	1-10	9 contacts →
	Indirect evidence “Smart, sustainable heating and cooling, powered by the earth.” Source: RevenueBase Database · checked Sep 16, 2026
15	Black Isle Renewables LTD	Indirect evidence	Dingwall, United KingdomHQ checked Sep 16, 2026	11-50	7 contacts →
	Indirect evidence “Black Isle Renewables is proud to be one of the country’s leading providers of renewable energy heating solutions.” Source: RevenueBase Database · checked Sep 16, 2026
16	AAC Group LTD	Indirect evidence	Folkestone, United KingdomHQ checked Sep 16, 2026	1-10	6 contacts →
	Indirect evidence “AAC Group Ltd is a specialist provider in ASHP (Air Source Heat Pumps) and HVAC (Heating, Ventilation, and Air Conditioning) solutions.” Source: RevenueBase Database · checked Sep 16, 2026
17	Muovitech UK Limited	Partial evidence	Wilpshire, United KingdomHQ checked Sep 16, 2026	1-10	5 contacts →
	Partial evidence “MuoviTech are the European leaders, supplying products for geothermal energy collection systems throughout the UK and Europe with own factories in Sweden, Finland, Poland…” Source: RevenueBase Database · checked Sep 16, 2026
18	Orangehouse Renewables LTD	Indirect evidence	Peterborough, United KingdomHQ checked Sep 16, 2026	11-50	5 contacts →
	Indirect evidence “Orangehouse Renewables is an accredited and award winning renewable energy company.” Source: RevenueBase Database · checked Sep 16, 2026
19	Onsen Energy	Indirect evidence	Bordon, United KingdomHQ checked Sep 16, 2026	11-50	4 contacts →
	Indirect evidence “At Onsen Energy, we provide homeowners, developers, sports clubs, schools and the wider energy market with ground source heating systems and drilling services.” Source: RevenueBase Database · checked Sep 16, 2026
20	Primeval Energy LTD	Partial evidence	Cambridge, United KingdomHQ checked Sep 16, 2026	1-10	4 contacts →
	Partial evidence “Primeval Energy is a geothermal solutions company, newly established by seasoned oil and gas, geothermal, finance and commercial professionals.” Source: RevenueBase Database · checked Sep 16, 2026
21	Rhico District Heating Products	Indirect evidence	Christchurch, United KingdomHQ checked Sep 16, 2026	1-10	4 contacts →
	Indirect evidence “Rhico's new range of ULTRA LEAN HIU's offer building consultants the opportunity to reduce primary flow temperatures to a minimum of 55 degrees C while still producing enough hot…” Source: RevenueBase Database · checked Sep 16, 2026
22	Renewable Energy Devices Limited	Partial evidence	Craigavon, United KingdomHQ checked Sep 16, 2026	1-10	3 contacts →
	Partial evidence “Renewable Energy Devices Limited, aka RED, are manufactures of ultra high efficiency Air Source Heat Pumps and associated technologies.” Source: RevenueBase Database · checked Sep 16, 2026
23	Surface Renewables	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	2 contacts →
	Indirect evidence “At Surface Renewables our mission is to create healthy homes, inside and out.” Source: RevenueBase Database · checked Sep 16, 2026
24	Arriba Technologies	Indirect evidence	Cambridge, United KingdomHQ checked Sep 16, 2026	11-50	2 contacts →
	Indirect evidence “Heat Pumps & Chillers for Ecologically Balanced Buildings” Source: RevenueBase Database · checked Sep 16, 2026
25	Hydroscot Energies LTD	Indirect evidence	Dundee, United KingdomHQ checked Sep 16, 2026	1-10	2 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 16, 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 equipment manufacturers. 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 equipment manufacturers.
Partial evidence: Its own public description names part of geothermal equipment manufacturers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name geothermal equipment manufacturers. 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 65 geothermal equipment manufacturers based in the United Kingdom

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Geothermal equipment manufacturers based in the United Kingdom at a glance

As of Sep 16, 2026

28.1%Verified-email coverage

11.6Average contacts per company

1-10Median size (employees)

9.2%Largest-city concentration · London

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

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 65 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 equipment manufacturers, 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 equipment manufacturers”. 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 equipment manufacturers), 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 equipment manufacturers, 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, 212 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 16, 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.

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 equipment manufacturers, 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 equipment manufacturers are there based in the United Kingdom?

RevenueBase identified 65 geothermal equipment manufacturers 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?

Vaillant UK, headquartered in Belper, tops this list with the largest team on record.

Which city has the most geothermal equipment manufacturers?

London leads with 6 headquartered companies, followed by Cambridge (2) and Derby (2).

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 212 verified decision-maker contacts tracked across these 65 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 16, 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.