Company lists · Data refreshed September 2026

Top 25 Geothermal heating installers based in the United Kingdom

Name: Geothermal heating 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 798 companies tracked

RevenueBase identified 798 geothermal heating installers headquartered in the United Kingdom as of September 2026 and tracks 5,500 professional contacts across them, including 1,537 with verified work emails. London is the largest hub.

This list covers geothermal heating 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

798Companies

5,500Contacts tracked

1,537Verified emails

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The 25 largest geothermal heating installers based in the United Kingdom

Ranked by team size

Top 25 of 798 geothermal heating 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 geothermal heating 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	KENSA	Partial evidence	Truro, United KingdomHQ checked Sep 19, 2026	51-200	143 contacts →
	Partial evidence “The UK’s heating system is stuck in the past, costing people and the planet too much.” Source: RevenueBase Database · checked Sep 19, 2026
3	Swale Heating Part Of Sureserve	Partial evidence	Sittingbourne, United KingdomHQ checked Sep 19, 2026	201-500	136 contacts →
	Partial 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 19, 2026
4	Bring Energy	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	125 contacts →
	Indirect evidence “We are Bring Energy.” Source: RevenueBase Database · checked Sep 19, 2026
5	BOXT	Indirect evidence	Leeds, United KingdomHQ checked Sep 19, 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 19, 2026
6	AES	Indirect evidence	Enfield, United KingdomHQ checked Sep 19, 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 19, 2026
7	Glow Green	Partial evidence	Bournemouth, United KingdomHQ checked Sep 19, 2026	51-200	110 contacts →
	Partial 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 19, 2026
8	Nu-Heat Underfloor Heating & Renewables	Strong evidence	Honiton, United KingdomHQ checked Sep 19, 2026	51-200	70 contacts →
	Strong 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 19, 2026
9	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
10	Scis Group	Indirect evidence	Fareham, United KingdomHQ checked Sep 19, 2026	51-200	60 contacts →
	Indirect evidence “Hello.” Source: RevenueBase Database · checked Sep 19, 2026
11	Heatforce	Indirect evidence	Cardiff, United KingdomHQ checked Sep 19, 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 19, 2026
12	WMS Underfloor Heating	Strong evidence	Brookmans Park, United KingdomHQ checked Sep 19, 2026	11-50	51 contacts →
	Strong evidence “Leading supplier and installer of underfloor heating for residential developments in the UK.” Source: RevenueBase Database · checked Sep 19, 2026
13	SBS Electrical Limited	Indirect evidence	West Sussex, United KingdomHQ checked Sep 19, 2026	n/a	50 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
14	Golden Globe Merchants LTD	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	38 contacts →
	Indirect evidence “At Golden Globe Merchants, we deliver high-performance, energy-efficient solutions designed to future-proof UK homes.” Source: RevenueBase Database · checked Sep 19, 2026
15	Heatable	Partial evidence	Warrington, United KingdomHQ checked Sep 19, 2026	11-50	37 contacts →
	Partial evidence “The UK's trusted boiler, aircon and renewable installers.” Source: RevenueBase Database · checked Sep 19, 2026
16	Pure Renewables	Indirect evidence	Hull, United KingdomHQ checked Sep 19, 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 19, 2026
17	Thermamech	Partial evidence	Bristol, United KingdomHQ checked Sep 19, 2026	51-200	30 contacts →
	Partial evidence “ThermaMech is one of the UK’s fastest growing businesses within the District Heating Installation market, currently employing around 30 people in the UK.” Source: RevenueBase Database · checked Sep 19, 2026
18	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
19	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
20	Eclipse Energy	Indirect evidence	Halifax, United KingdomHQ checked Sep 19, 2026	11-50	27 contacts →
	Indirect evidence “Eclipse Energy are specialists in providing affordable and efficient ways to keep your home warm and dry for less.” Source: RevenueBase Database · checked Sep 19, 2026
21	M&n Heating & Plumbing	Partial evidence	Banbury, United KingdomHQ checked Sep 19, 2026	51-200	26 contacts →
	Partial 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 19, 2026
22	ECO 247	Indirect evidence	St Asaph, United KingdomHQ checked Sep 19, 2026	51-200	25 contacts →
	Indirect evidence “At Eco 247, we are committed to building a greener future through sustainable energy solutions.” Source: RevenueBase Database · checked Sep 19, 2026
23	Green Improve	Partial evidence	Blackburn, United KingdomHQ checked Sep 19, 2026	11-50	24 contacts →
	Partial evidence “At Green Improve, we specialise in providing solutions for renewable heating and insulation installations.” Source: RevenueBase Database · checked Sep 19, 2026
24	ESE Solar	Indirect evidence	Liverpool, United KingdomHQ checked Sep 19, 2026	11-50	23 contacts →
	Indirect evidence “One of the UK's leading providers of green energy solutions.” Source: RevenueBase Database · checked Sep 19, 2026
25	Rayotec LTD	Indirect evidence	Sunbury On Thames, United KingdomHQ checked Sep 19, 2026	11-50	22 contacts →
	Indirect evidence “Rayotec are specialists in renewable energy solutions.” 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: geothermal heating 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 geothermal heating installers.
Partial evidence: Its own public description names part of geothermal heating installers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name geothermal heating 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 798 geothermal heating installers based in the United Kingdom

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Geothermal heating installers based in the United Kingdom at a glance

As of Sep 19, 2026

27.9%Verified-email coverage

6.9Average contacts per company

1-10Median size (employees)

6.0%Largest-city concentration · London

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

443

11-50

269

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 798 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 heating 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 “geothermal heating 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 geothermal heating 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 geothermal heating 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, 1,537 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.

Geothermal heating installers by metro

Geothermal heating installers in London48

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 heating 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 geothermal heating installers are there based in the United Kingdom?

RevenueBase identified 798 geothermal heating 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 geothermal heating installers?

London leads with 48 headquartered companies, followed by Bristol (14) and Leeds (10).

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 1,537 verified decision-maker contacts tracked across these 798 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.