Company lists · Data refreshed September 2026

Top 25 Solar water heater installation companies based in the United Kingdom

Name: Solar water heater 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 18, 2026 975 companies tracked

RevenueBase identified 975 solar water heater installation companies headquartered in the United Kingdom as of September 2026 and tracks 6,388 professional contacts across them, including 2,105 with verified work emails. London is the largest hub.

This list covers solar water heater 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 18, 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 18, 2026 86% judged on-target in blind review

975Companies

6,388Contacts tracked

2,105Verified emails

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The 25 largest solar water heater installation companies based in the United Kingdom

Ranked by team size

Top 25 of 975 solar water heater installation companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 18, 2026. RevenueBase Smart Search rates how each company's information relates to solar water heater 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	BAXI	Strong evidence	Warwick, United KingdomHQ checked Sep 18, 2026	1,001-5,000	850 contacts →
	Strong 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 18, 2026
2	Project Solar UK	Partial evidence	Burton On Trent, United KingdomHQ checked Sep 18, 2026	201-500	122 contacts →
	Partial evidence “Project Solar UK Ltd are a well-established Renewable Energy company.” Source: RevenueBase Database · checked Sep 18, 2026
3	BOXT	Partial evidence	Leeds, United KingdomHQ checked Sep 18, 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 18, 2026
4	AES	Indirect evidence	Enfield, United KingdomHQ checked Sep 18, 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 18, 2026
5	Glow Green	Strong evidence	Bournemouth, United KingdomHQ checked Sep 18, 2026	51-200	110 contacts →
	Strong 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 18, 2026
6	CPS Building Services LTD	Partial evidence	Cambridge, United KingdomHQ checked Sep 18, 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 18, 2026
7	Purdy Part Of Sureserve	Indirect evidence	London, United KingdomHQ checked Sep 18, 2026	201-500	85 contacts →
	Indirect evidence “Who are we?” Source: RevenueBase Database · checked Sep 18, 2026
8	Evergen Solar	Partial evidence	Maidenhead, United KingdomHQ checked Sep 18, 2026	51-200	79 contacts →
	Partial evidence “Fully funded solar solutions specialising in Commercial and Residential Solar with Battery.” Source: RevenueBase Database · checked Sep 18, 2026
9	ECO Approach	Indirect evidence	Beckenham, United KingdomHQ checked Sep 18, 2026	51-200	67 contacts →
	Indirect evidence “We’re a leading nationwide property services company established in 2013.” Source: RevenueBase Database · checked Sep 18, 2026
10	Dulas LTD	Partial evidence	Machynlleth, United KingdomHQ checked Sep 18, 2026	51-200	64 contacts →
	Partial evidence “With over 35 years of experience in the clean energy sector, Dulas is an award-winning renewable energy installer and consultancy, specialising in the wind, solar and hydro…” Source: RevenueBase Database · checked Sep 18, 2026
11	Scis Group	Indirect evidence	Fareham, United KingdomHQ checked Sep 18, 2026	51-200	60 contacts →
	Indirect evidence “Hello.” Source: RevenueBase Database · checked Sep 18, 2026
12	Ecolution Group	Indirect evidence	Trottiscliffe, United KingdomHQ checked Sep 18, 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 18, 2026
13	Evoenergy	Indirect evidence	Nottingham, United KingdomHQ checked Sep 18, 2026	11-50	54 contacts →
	Indirect evidence “Driving the market through innovation, EvoEnergy are the UK’s leading energy technology solutions provider, helping blue-chip clients and SME’s turn their sites into ‘sustainable…” Source: RevenueBase Database · checked Sep 18, 2026
14	Heatforce	Partial evidence	Cardiff, United KingdomHQ checked Sep 18, 2026	51-200	53 contacts →
	Partial 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 18, 2026
15	ECO Providers	Indirect evidence	Clitheroe, United KingdomHQ checked Sep 18, 2026	51-200	51 contacts →
	Indirect evidence “ECO Providers is a trusted leader in renewable and energy efficiency solutions, helping homeowners, businesses, and social housing organisations reduce energy costs, improve…” Source: RevenueBase Database · checked Sep 18, 2026
16	Cotswold Energy Group	Indirect evidence	Stonehouse, United KingdomHQ checked Sep 18, 2026	51-200	45 contacts →
	Indirect evidence “Secure your greener future with renewable energy solutions!” Source: RevenueBase Database · checked Sep 18, 2026
17	Solmatix Renewables LTD	Indirect evidence	Dundrod Rd, United KingdomHQ checked Sep 18, 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 18, 2026
18	ALL Seasons Energy	Strong evidence	Sheffield, United KingdomHQ checked Sep 18, 2026	51-200	40 contacts →
	Strong evidence “All Seasons Energy is a Sheffield-based solar panel, air source heat pump, and insulation installer.” Source: RevenueBase Database · checked Sep 18, 2026
19	Solarsense UK Certified B Corporation	Strong evidence	Clevedon, United KingdomHQ checked Sep 18, 2026	51-200	39 contacts →
	Strong evidence “SolarSense specialise in the design, installation and maintenance of solar panels, energy storage, solar carports and other renewable energy technologies.” Source: RevenueBase Database · checked Sep 18, 2026
20	Start Solar UK & Ireland	Strong evidence	Lissue Industrial Estate, United KingdomHQ checked Sep 18, 2026	51-200	39 contacts →
	Strong evidence “Start Solar is a renewable energy – design and installation – company that specialises in a range of renewable energy solutions.” Source: RevenueBase Database · checked Sep 18, 2026
21	Golden Globe Merchants LTD	Indirect evidence	London, United KingdomHQ checked Sep 18, 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 18, 2026
22	Pure Renewables	Strong evidence	Hull, United KingdomHQ checked Sep 18, 2026	11-50	37 contacts →
	Strong 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 18, 2026
23	Sungift Solar	Partial evidence	Exeter, United KingdomHQ checked Sep 18, 2026	51-200	35 contacts →
	Partial evidence “SunGift Solar are an award-winning renewable energy company, founded in 2005.” Source: RevenueBase Database · checked Sep 18, 2026
24	Centreco UK LTD	Partial evidence	Chorley, United KingdomHQ checked Sep 18, 2026	51-200	34 contacts →
	Partial evidence “Centreco are a leading provider of commercial solar energy systems to companies throughout the United Kingdom, part of Certas Energy UK a member of DCC Group Plc.” Source: RevenueBase Database · checked Sep 18, 2026
25	Forster Group	Indirect evidence	Brechin, United KingdomHQ checked Sep 18, 2026	51-200	33 contacts →
	Indirect evidence “Forster Group is one of Scotland’s leading renewable energy and roofing specialists, combining over three decades of expertise with a forward-thinking approach.” Source: RevenueBase Database · checked Sep 18, 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: solar water heater 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 solar water heater installation companies.
Partial evidence: Its own public description names part of solar water heater installation companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name solar water heater 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 975 solar water heater installation companies based in the United Kingdom

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Solar water heater installation companies based in the United Kingdom at a glance

As of Sep 18, 2026

33.0%Verified-email coverage

6.6Average contacts per company

1-10Median size (employees)

5.4%Largest-city concentration · London

Sep 18, 2026Page data refreshed

Companies by employee count

1-10

514

11-50

364

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 975 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 solar water heater 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 “solar water heater 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 solar water heater 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 solar water heater 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, 2,105 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 18, 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.

Solar water heater installation companies by metro

Solar water heater installation companies in London53

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 solar water heater 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 solar water heater installation companies are there based in the United Kingdom?

RevenueBase identified 975 solar water heater 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?

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

Which city has the most solar water heater installation companies?

London leads with 53 headquartered companies, followed by Glasgow (15) and Nottingham (14).

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 2,105 verified decision-maker contacts tracked across these 975 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 18, 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.