Company lists · Data refreshed September 2026

Top 25 Hvac water treatment services based in the United Kingdom

Name: Hvac water treatment services 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 277 companies tracked

RevenueBase identified 277 hvac water treatment services headquartered in the United Kingdom as of September 2026 and tracks 4,342 professional contacts across them, including 1,723 with verified work emails. London is the largest hub.

This list covers hvac water treatment services 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

277Companies

4,342Contacts tracked

1,723Verified emails

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The 25 largest hvac water treatment services based in the United Kingdom

Ranked by team size

Top 25 of 277 hvac water treatment services 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 hvac water treatment services: 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	RSE	Partial evidence	Inverness Highlands, United KingdomHQ checked Sep 20, 2026	501-1,000	498 contacts →
	Partial evidence “RSE is a trusted clean water technology company, developing market leading products and solutions for purifying drinking water, recycling wastewater and cleaning water in…” Source: RevenueBase Database · checked Sep 20, 2026
2	NCH Europe	Indirect evidence	Wolverhampton, United KingdomHQ checked Sep 20, 2026	10001+	453 contacts →
	Indirect evidence “Industrial solutions since 1919 At NCH, we don’t just sell products-we deliver solutions that keep businesses moving.” Source: RevenueBase Database · checked Sep 20, 2026
3	Culligan UK	Partial evidence	Dereham, United KingdomHQ checked Sep 20, 2026	501-1,000	231 contacts →
	Partial evidence “Culligan UK delivers innovative, high-quality water solutions to homes and businesses across the United Kingdom.” Source: RevenueBase Database · checked Sep 20, 2026
4	ADEY	Indirect evidence	Stonehouse, United KingdomHQ checked Sep 20, 2026	201-500	129 contacts →
	Indirect evidence “ADEY is working towards a future where every heating and cooling system is protected from corrosion; saving money, energy and time across the globe.” Source: RevenueBase Database · checked Sep 20, 2026
5	Daikin Applied UK LTD	Partial evidence	Cramlington, United KingdomHQ checked Sep 20, 2026	51-200	97 contacts →
	Partial evidence “Daikin Applied (UK) Ltd (formerly McQuay UK Ltd) is the market leader in energy-efficient end-to-end HVAC solutions, including AHU and chiller products, heat pumps, service and…” Source: RevenueBase Database · checked Sep 20, 2026
6	Feedwater Limited	Strong evidence	Moreton, United KingdomHQ checked Sep 20, 2026	51-200	79 contacts →
	Strong evidence “Feedwater Ltd is a UK Water Treatment Company, established in 1976 specifically to supply products and services for the treatment of water for steam boilers, cooling towers…” Source: RevenueBase Database · checked Sep 20, 2026
7	Envirogen Group	Strong evidence	Alfreton, United KingdomHQ checked Sep 20, 2026	201-500	75 contacts →
	Strong evidence “Envirogen Group is a global leader in industrial water treatment and process filtration solutions.” Source: RevenueBase Database · checked Sep 20, 2026
8	Siltbuster LTD	Strong evidence	Monmouth, United KingdomHQ checked Sep 20, 2026	51-200	75 contacts →
	Strong evidence “At Siltbuster Ltd, we operate the UK’s largest rental fleet of water treatment systems, setting the industry benchmark for rapid, reliable, and cost-effective solutions.” Source: RevenueBase Database · checked Sep 20, 2026
9	Fernox	Strong evidence	Woking, United KingdomHQ checked Sep 20, 2026	51-200	72 contacts →
	Strong evidence “Established in 1964, Fernox is a leading manufacturer of water treatment chemical products, central heating system filters, plumbing consumables and diagnostic testing services.” Source: RevenueBase Database · checked Sep 20, 2026
10	Ashford Environmental Services Limited	Strong evidence	Ashford, United KingdomHQ checked Sep 20, 2026	51-200	61 contacts →
	Strong evidence “Welcome to Ashford Environmental Services Limited, the UK's leading building services commissioning and water treatment specialist, providing a fully integrated service to…” Source: RevenueBase Database · checked Sep 20, 2026
11	Fileder Filter Systems	Indirect evidence	Maidstone, United KingdomHQ checked Sep 20, 2026	51-200	53 contacts →
	Indirect evidence “In short, we’re 'easy to deal with'.” Source: RevenueBase Database · checked Sep 20, 2026
12	Advanced Water Technologies	Strong evidence	Warrington, United KingdomHQ checked Sep 20, 2026	51-200	52 contacts →
	Strong evidence “Welcome to Advanced Water Technologies: A dedicated water treatment & hygiene specialists focused on providing optimum solutions across a vast array of services, chemicals…” Source: RevenueBase Database · checked Sep 20, 2026
13	Sentinel Performance Solutions LTD	Partial evidence	Warrington, United KingdomHQ checked Sep 20, 2026	51-200	51 contacts →
	Partial evidence “We clean, protect and maintain domestic and commercial heating and hot water systems by providing best practice solutions and products internationally.” Source: RevenueBase Database · checked Sep 20, 2026
14	Guardian Water Treatment Marlowe Environmental Services	Strong evidence	Basildon, United KingdomHQ checked Sep 20, 2026	51-200	50 contacts →
	Strong evidence “Guardian part of Marlowe Environmental Services, delivers a range of water treatment and air quality services, allowing the systems that rely on these elements to work effectively…” Source: RevenueBase Database · checked Sep 20, 2026
15	Hydrotec Water Treatment Specialists	Strong evidence	High Wycombe, United KingdomHQ checked Sep 20, 2026	51-200	50 contacts →
	Strong evidence “Hydrotec is the UK’s leading company in the design and manufacture of water treatment products for the building services industry.” Source: RevenueBase Database · checked Sep 20, 2026
16	Mitsubishi Heavy Industries Air-Conditioning Europe	Partial evidence	Uxbridge, United KingdomHQ checked Sep 20, 2026	51-200	50 contacts →
	Partial evidence “Welcome to Mitsubishi Heavy Industries Air Conditioning Europe Ltd (MHIAE), a company created by MHI for all HVAC solutions across Europe.” Source: RevenueBase Database · checked Sep 20, 2026
17	Billi UK	Partial evidence	Wolverhampton, United KingdomHQ checked Sep 20, 2026	51-200	40 contacts →
	Partial evidence “At Billi, we design and manufacture a range of energy efficient filtered water systems that offer our customers the very best in innovation, superior performance and reliability.” Source: RevenueBase Database · checked Sep 20, 2026
18	Cleartech Group	Strong evidence	Glasgow, United KingdomHQ checked Sep 20, 2026	51-200	39 contacts →
	Strong evidence “Cleartech Group have been leading specialists in the HVAC commissioning, water treatment and L8 compliance industry for over 20 years, striving for long-lasting partnerships and…” Source: RevenueBase Database · checked Sep 20, 2026
19	361 Degrees LTD AIR Conditioning, Heating & Ventilation Solutions	Indirect evidence	Leighton Buzzard, United KingdomHQ checked Sep 20, 2026	11-50	30 contacts →
	Indirect evidence “A good environment can improve morale, productivity and employee retention.” Source: RevenueBase Database · checked Sep 20, 2026
20	GES Water	Indirect evidence	Aylesbury, United KingdomHQ checked Sep 20, 2026	11-50	30 contacts →
	Indirect evidence “Since 1990 we have provided our clients with leading edge solutions to legionella management.” Source: RevenueBase Database · checked Sep 20, 2026
21	Surevent UK LTD	Partial evidence	Daventry, United KingdomHQ checked Sep 20, 2026	51-200	27 contacts →
	Partial evidence “Surevent works with your business to provide bespoke water management, air quality, and ductwork maintenance solutions.” Source: RevenueBase Database · checked Sep 20, 2026
22	Lubron UK	Strong evidence	Colchester, United KingdomHQ checked Sep 20, 2026	51-200	26 contacts →
	Strong evidence “Lubron Water Technology UK is part of the European Market leading water treatment provider, Lubron Group, which has subsidiaries in the Netherlands, Germany and Belgium.” Source: RevenueBase Database · checked Sep 20, 2026
23	The Protech Group	Indirect evidence	Glasgow, United KingdomHQ checked Sep 20, 2026	11-50	26 contacts →
	Indirect evidence “Protech Group \| Built on Trust.” Source: RevenueBase Database · checked Sep 20, 2026
24	TWC Total Water Care	Strong evidence	Bicester, United KingdomHQ checked Sep 20, 2026	11-50	22 contacts →
	Strong evidence “Our core team have numerous years experience in the field of commercial water treatment and a proven track record of delivering effective, compliant water treatments packages.” Source: RevenueBase Database · checked Sep 20, 2026
25	Beta Group LTD	Indirect evidence	Bacup, United KingdomHQ checked Sep 20, 2026	51-200	21 contacts →
	Indirect evidence “Specialists in Air Filtration & Engineering Services.” 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: hvac water treatment services. 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 hvac water treatment services.
Partial evidence: Its own public description names part of hvac water treatment services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name hvac water treatment services. 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 277 hvac water treatment services based in the United Kingdom

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Hvac water treatment services based in the United Kingdom at a glance

As of Sep 20, 2026

39.7%Verified-email coverage

15.7Average contacts per company

11-50Median size (employees)

5.8%Largest-city concentration · London

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

125

11-50

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 277 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 hvac water treatment services, 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 “hvac water treatment services”. 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 hvac water treatment services), 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 hvac water treatment services, 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, 1,723 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.

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 hvac water treatment services, 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 hvac water treatment services are there based in the United Kingdom?

RevenueBase identified 277 hvac water treatment services 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?

RSE, headquartered in Inverness Highlands, tops this list with the largest team on record.

Which city has the most hvac water treatment services?

London leads with 16 headquartered companies, followed by Manchester (6) and Birmingham (4).

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 1,723 verified decision-maker contacts tracked across these 277 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.