Company lists · Data refreshed September 2026

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

Name: Commercial 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 19, 2026 729 companies tracked

RevenueBase identified 729 commercial water heater installation companies headquartered in the United Kingdom as of September 2026 and tracks 3,473 professional contacts across them, including 898 with verified work emails. London is the largest hub.

This list covers commercial 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 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

729Companies

3,473Contacts tracked

898Verified emails

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

Ranked by team size

Top 25 of 729 commercial water heater installation companies 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 commercial 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 19, 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 19, 2026
2	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
3	Byworth Boilers Limited	Indirect evidence	Keighley, United KingdomHQ checked Sep 19, 2026	51-200	96 contacts →
	Indirect evidence “Your industrial boiler is at the heart of your operations.” Source: RevenueBase Database · checked Sep 19, 2026
4	James Ramsay	Partial evidence	Glasgow, United KingdomHQ checked Sep 19, 2026	51-200	54 contacts →
	Partial evidence “Heating - Pipework - Process - Maintenance.” Source: RevenueBase Database · checked Sep 19, 2026
5	Sentinel Performance Solutions LTD	Strong evidence	Warrington, United KingdomHQ checked Sep 19, 2026	51-200	51 contacts →
	Strong 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 19, 2026
6	Hamworthy Heating LTD	Strong evidence	Hull, United KingdomHQ checked Sep 19, 2026	51-200	45 contacts →
	Strong evidence “Hamworthy Heating is a British manufacturer and supplier of commercial heating and hot water products.” Source: RevenueBase Database · checked Sep 19, 2026
7	Plumbing & GAS Solutions LTD	Strong evidence	Milton Keynes, United KingdomHQ checked Sep 19, 2026	11-50	41 contacts →
	Strong evidence “Plumbing & Gas Solutions Ltd are a Constructionline and CHAS accredited Commercial Plumbing & Heating contractor based in Milton Keynes.” Source: RevenueBase Database · checked Sep 19, 2026
8	Lochinvar, UK	Strong evidence	Banbury, United KingdomHQ checked Sep 19, 2026	11-50	40 contacts →
	Strong 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 19, 2026
9	Principal Hvac	Strong evidence	Belfast, United KingdomHQ checked Sep 19, 2026	51-200	34 contacts →
	Strong evidence “Principal HVAC are at the leading edge of Heating, Ventilation & Air conditioning systems for commercial and residential property.” Source: RevenueBase Database · checked Sep 19, 2026
10	VHL Mechanical	Strong evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	29 contacts →
	Strong evidence “We are one of the leading plumbing, heating and electrical companies nationally, serving residential and commercial clients throughout South East England With almost three decades…” Source: RevenueBase Database · checked Sep 19, 2026
11	JSA Service	Strong evidence	Sunbury, United KingdomHQ checked Sep 19, 2026	11-50	26 contacts →
	Strong evidence “JSA Service specialise in providing first class commercial Heating, Ventilation, Air Conditioning and Refrigeration services for nearly 50 years.” Source: RevenueBase Database · checked Sep 19, 2026
12	Bonus Eventus Maintenance LTD	Strong evidence	Camberley, United KingdomHQ checked Sep 19, 2026	11-50	26 contacts →
	Strong evidence “Trusted provider of cost-saving maintenance and repair of commercial heating, ventilation & air conditioning (HVAC) systems in London, Surrey, Hampshire, Hertfordshire, Berkshire…” Source: RevenueBase Database · checked Sep 19, 2026
13	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
14	HCS Mechanical Services	Partial evidence	Skipton, United KingdomHQ checked Sep 19, 2026	51-200	26 contacts →
	Partial evidence “H Clarke & Sons Ltd was first established in 1920 and has grown to become one of the most renowned independent heating and plumbing companies in the region.” Source: RevenueBase Database · checked Sep 19, 2026
15	Adveco LTD	Indirect evidence	Farnborough, United KingdomHQ checked Sep 19, 2026	11-50	24 contacts →
	Indirect evidence “With more than 50 years of industry experience, Adveco Ltd.” Source: RevenueBase Database · checked Sep 19, 2026
16	Huttie Building Services	Strong evidence	Cambridge, United KingdomHQ checked Sep 19, 2026	11-50	24 contacts →
	Strong evidence “Huttie group was founded in 2007 and provides full commercial and residential plumbing, heating and electrical services - Commercial: For every business and building type, you…” Source: RevenueBase Database · checked Sep 19, 2026
17	Mcquillan Boiler Services LTD	Partial evidence	Rochdale, United KingdomHQ checked Sep 19, 2026	51-200	18 contacts →
	Partial evidence “McQuillan Boiler Services was established in 1989 with the intention of offering our loyal customers reliable support and servicing with both their industrial and commercial steam…” Source: RevenueBase Database · checked Sep 19, 2026
18	Cleanheat	Strong evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	17 contacts →
	Strong evidence “CleanHeat are a London based Commercial Heating and engineering company working throughout central London and the Home Counties.” Source: RevenueBase Database · checked Sep 19, 2026
19	K&m Technical Services	Strong evidence	Belfast, United KingdomHQ checked Sep 19, 2026	51-200	16 contacts →
	Strong evidence “KM Technical is one of UK’s leading provider of installation and service solutions in the areas of electrical installation, heating & plumbing and heating ventilation and air…” Source: RevenueBase Database · checked Sep 19, 2026
20	SGS Heating & Electrical LTD	Strong evidence	Salisbury, United KingdomHQ checked Sep 19, 2026	11-50	16 contacts →
	Strong evidence “SGS are a heating, plumbing, electrical company specialising in both domestic and commercial applications.” Source: RevenueBase Database · checked Sep 19, 2026
21	Climatix Group	Indirect evidence	Church Fenton, United KingdomHQ checked Sep 19, 2026	11-50	16 contacts →
	Indirect evidence “Born in Yorkshire.” Source: RevenueBase Database · checked Sep 19, 2026
22	Simple Heating Services LTD	Indirect evidence	Liverpool, United KingdomHQ checked Sep 19, 2026	51-200	16 contacts →
	Indirect evidence “Keeping your home or business warm is essential, especially during the winter.” Source: RevenueBase Database · checked Sep 19, 2026
23	Tencer LTD	Strong evidence	High Wycombe, United KingdomHQ checked Sep 19, 2026	51-200	14 contacts →
	Strong evidence “Heating, Plumbing, Air Conditioning, Electrical & BMS Installation, Servicing and Repair.” Source: RevenueBase Database · checked Sep 19, 2026
24	Pearce Elite Plumbing & Heating Limited	Indirect evidence	Port Talbot, United KingdomHQ checked Sep 19, 2026	11-50	14 contacts →
	Indirect evidence “We do it all.” Source: RevenueBase Database · checked Sep 19, 2026
25	Clever Energy Boilers	Indirect evidence	Keighley, United KingdomHQ checked Sep 19, 2026	11-50	13 contacts →
	Indirect evidence “CLEVER ENERGY BOILERS is part of the Green Deal Factory.” 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: commercial 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 commercial water heater installation companies.
Partial evidence: Its own public description names part of commercial 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 commercial 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 729 commercial water heater installation companies based in the United Kingdom

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

As of Sep 19, 2026

25.9%Verified-email coverage

4.8Average contacts per company

1-10Median size (employees)

8.0%Largest-city concentration · London

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

481

11-50

187

51-200

201-500

501-1,000

1,001-5,000

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 729 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 commercial 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 “commercial 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 commercial 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 commercial 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, 898 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.

Commercial water heater installation companies by metro

Commercial water heater installation companies in London58

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

RevenueBase identified 729 commercial 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 commercial water heater installation companies?

London leads with 58 headquartered companies, followed by Manchester (9) and Norwich (9).

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 898 verified decision-maker contacts tracked across these 729 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.