Company lists · Data refreshed September 2026

Top 25 Industrial water heater installers worldwide

Name: Industrial water heater installers worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 8,135 companies tracked

RevenueBase identified 8,135 industrial water heater installers worldwide as of September 2026 and tracks 64,615 professional contacts across them, including 19,403 with verified work emails and 0 with mobile numbers. The United States is the largest market and London the largest hub.

This list covers industrial water heater installers worldwide, 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 17, 2026. Country and city lists for industrial water heater installers follow the table.

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 17, 2026 86% judged on-target in blind review

8,135Companies

64,615Contacts tracked

19,403Verified emails

0Mobile numbers

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The 25 largest industrial water heater installers worldwide

Ranked by team size

Top 25 of 8,135 industrial water heater installers worldwide, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to industrial water heater 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	Acco Engineered Systems	Indirect evidence	Pasadena, CA, United StatesHQ checked Sep 17, 2026	5,001-10,000	2,415 contacts →
	Indirect evidence “Since 1934, owners and builders have selected ACCO Engineered Systems to design, install, and maintain more than mechanical projects.” Source: RevenueBase Database · checked Sep 17, 2026
2	Mckenney's, INC	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,077 contacts →
	Indirect evidence “McKenney’s is the Southeast’s most trusted name in facility construction, operation and maintenance.” Source: RevenueBase Database · checked Sep 17, 2026
3	Thermon	Strong evidence	Austin, TX, United StatesHQ checked Sep 17, 2026	1,001-5,000	901 contacts →
	Strong evidence “Industrial Process Heating Solutions Through its global network, Thermon provides safe, reliable and innovative mission critical industrial process heating solutions.” Source: RevenueBase Database · checked Sep 17, 2026
4	Bradford White	Strong evidence	Ambler, PA, United StatesHQ checked Sep 17, 2026	1,001-5,000	689 contacts →
	Strong evidence “Bradford White Corporation is an American-owned, full-line manufacturer of residential, commercial, and industrial products for water heating, space heating, combination heating…” Source: RevenueBase Database · checked Sep 17, 2026
5	John Thompson	Indirect evidence	Cape Town, South AfricaHQ checked Sep 17, 2026	1,001-5,000	629 contacts →
	Indirect evidence “John Thompson is a leader in energy and environmental solutions through value engineering and innovation.” Source: RevenueBase Database · checked Sep 17, 2026
6	Stiebel Eltron Group	Indirect evidence	Holzminden, GermanyHQ checked Sep 17, 2026	5,001-10,000	493 contacts →
	Indirect evidence “STIEBEL ELTRON bietet hocheffiziente Produkte und Dienstleistungen für die Heizung, Kühlung, Lüftung und Warmwasserbereitung von Gebäuden.” Source: RevenueBase Database · checked Sep 17, 2026
7	Horizon Services, LLC	Partial evidence	Wilmington, DE, United StatesHQ checked Sep 17, 2026	501-1,000	448 contacts →
	Partial evidence “Horizon Services is the premier heating, air conditioning, plumbing, drain cleaning and sewer services company in Delaware (New Castle County & Kent County), Pennsylvania…” Source: RevenueBase Database · checked Sep 17, 2026
8	Baymak BDR Thermea Group	Indirect evidence	İstanbul, TürkiyeHQ checked Sep 17, 2026	501-1,000	439 contacts →
	Indirect evidence “1969 yılında faaliyetlerine başlayan ve 2013 yılı itibarıyla iklimlendirme sektöründe Avrupa’nın ilk üç şirketi arasında yer alan BDR Thermea Group bünyesine katılan Baymak…” Source: RevenueBase Database · checked Sep 17, 2026
9	Ferroli Group	Strong evidence	San Bonifacio, ItalyHQ checked Sep 17, 2026	1,001-5,000	418 contacts →
	Strong evidence “Comfort, designed around you – Since 1955, Ferroli has been a trusted name in HVAC, delivering innovative solutions for heating, cooling and hot water that combine comfort, energy…” Source: RevenueBase Database · checked Sep 17, 2026
10	John W. Danforth Company	Indirect evidence	Tonawanda, NY, United StatesHQ checked Sep 17, 2026	501-1,000	415 contacts →
	Indirect evidence “We are powered by the best people in the industry.” Source: RevenueBase Database · checked Sep 17, 2026
11	United Mechanical	Partial evidence	San Jose, CA, United StatesHQ checked Sep 17, 2026	201-500	346 contacts →
	Partial evidence “United Mechanical specializes in HVAC and Plumbing systems design, construction, retrofit, repair, and 24/7 emergency service for commercial and industrial properties throughout…” Source: RevenueBase Database · checked Sep 17, 2026
12	Lochinvar, LLC	Strong evidence	Lebanon, TN, IndiaHQ checked Sep 17, 2026	201-500	340 contacts →
	Strong evidence “Lochinvar, LLC is a leading manufacturer of high-efficiency water heaters, boilers, pool heaters and custom pre-piped packaged systems.” Source: RevenueBase Database · checked Sep 17, 2026
13	Bassett Mechanical	Partial evidence	Kaukauna, WI, United StatesHQ checked Sep 17, 2026	201-500	298 contacts →
	Partial evidence “Bassett Mechanical provides complete design, engineering, fabrication, installation, and preventative maintenance service solutions for all our customer’s industrial…” Source: RevenueBase Database · checked Sep 17, 2026
14	Rinnai Australia	Indirect evidence	Braeside, AustraliaHQ checked Sep 17, 2026	201-500	294 contacts →
	Indirect evidence “Following Rinnai's international origins dating back more than 100 years, Rinnai Australia was established 50 years ago and since then has been providing Australians with the best…” Source: RevenueBase Database · checked Sep 17, 2026
15	Weil-Mclain	Partial evidence	Burr Ridge, IL, United StatesHQ checked Sep 17, 2026	501-1,000	279 contacts →
	Partial evidence “Weil-McLain® is a leading North American designer and manufacturer of hydronic comfort heating systems for residential, commercial and institutional buildings since 1881.” Source: RevenueBase Database · checked Sep 17, 2026
16	Remica	Indirect evidence	Madrid, SpainHQ checked Sep 17, 2026	501-1,000	279 contacts →
	Indirect evidence “Grupo Remica se crea en 1984 como empresa de instalación y mantenimiento de sistemas de calefacción, climatización y ACS.” Source: RevenueBase Database · checked Sep 17, 2026
17	GEM Incorporated	Indirect evidence	Walbridge, OH, United StatesHQ checked Sep 17, 2026	1,001-5,000	270 contacts →
	Indirect evidence “Contractor for Life At GEM Inc, we’re experienced problem solvers with the insight, integrity and resources to see you through your toughest challenges.” Source: RevenueBase Database · checked Sep 17, 2026
18	DH	Indirect evidence	Istanbul, TürkiyeHQ checked Sep 17, 2026	n/a	263 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026
19	The Arcticom Group	Partial evidence	Walnut Creek, CA, United StatesHQ checked Sep 17, 2026	1,001-5,000	259 contacts →
	Partial evidence “At The Arcticom Group (TAG), our family of best-in-market operating companies delivers the highest-quality service and customer experience in commercial and industrial HVACR.” Source: RevenueBase Database · checked Sep 17, 2026
20	Morris-Jenkins	Indirect evidence	Charlotte, NC, United StatesHQ checked Sep 17, 2026	501-1,000	225 contacts →
	Indirect evidence “Morris-Jenkins is like family!” Source: RevenueBase Database · checked Sep 17, 2026
21	Pueblo Mechanical & Controls	Indirect evidence	Phoenix, AZ, United StatesHQ checked Sep 17, 2026	501-1,000	214 contacts →
	Indirect evidence “Pueblo was founded in Arizona to achieve sustained and profitable growth by providing services that consistently satisfy the needs and expectations of its customers.” Source: RevenueBase Database · checked Sep 17, 2026
22	Tweet Garot Mechanical, INC	Indirect evidence	De Pere, WI, United StatesHQ checked Sep 17, 2026	501-1,000	207 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026
23	Cleaver-Brooks Sales And Service	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 17, 2026	201-500	193 contacts →
	Indirect evidence “Cleaver-Brooks Sales and Service, is one of the most innovative and fastest growing boiler services companies in the United States.” Source: RevenueBase Database · checked Sep 17, 2026
24	Haller Enterprises	Partial evidence	Lititz, PA, United StatesHQ checked Sep 17, 2026	201-500	191 contacts →
	Partial evidence “Since 1981, Haller Enterprises has proudly served central and eastern Pennsylvania as a leader in heating, cooling, plumbing, and electrical services.” Source: RevenueBase Database · checked Sep 17, 2026
25	R.F. Macdonald CO	Indirect evidence	Hayward, CA, United StatesHQ checked Sep 17, 2026	201-500	190 contacts →
	Indirect evidence “R.F.” Source: RevenueBase Database · checked Sep 17, 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: industrial water heater 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 industrial water heater installers.
Partial evidence: Its own public description names part of industrial water heater installers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name industrial water heater 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 8,135 industrial water heater installers worldwide

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Industrial water heater installers worldwide at a glance

As of Sep 17, 2026

30.0%Verified-email coverage

7.9Average contacts per company

11-50Median size (employees)

0.5%Largest-city concentration · London

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

3,890

11-50

3,038

51-200

776

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

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 industrial water heater 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.
Coverage: 20 countries, largest first: the United States, Italy, France, Germany, the United Kingdom, Canada, Spain, the Netherlands, Switzerland, Belgium and 10 more. Country and city lists for industrial water heater installers are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “industrial water heater 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 industrial water heater 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 industrial water heater installers, and records with no verified work email.
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, 19,403 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 17, 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.

Industrial water heater installers by location

20 lists · largest first

Every Industrial water heater installers list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

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 industrial water heater 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 industrial water heater installers are there worldwide?

RevenueBase identified 8,135 industrial water heater installers worldwide 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?

Acco Engineered Systems, headquartered in Pasadena, tops this list with the largest team on record.

Which country has the most industrial water heater installers?

The United States leads with 2,748 companies, followed by Italy (1,014) and France (788). Every industrial water heater installers list by country and city is linked on this page.

Which city has the most industrial water heater installers?

London leads with 41 headquartered companies, followed by Roma (36) and Sao Paulo (36).

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 19,403 verified decision-maker contacts tracked across these 8,135 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 17, 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.