Company lists · Data refreshed September 2026

Top 25 On-demand water heater companies based in the United States

Name: On-demand water heater companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 254 companies tracked

RevenueBase identified 254 on-demand water heater companies headquartered in the United States as of September 2026 and tracks 19,378 professional contacts across them, including 2,057 with verified work emails. Miami is the largest hub.

This list covers on-demand water heater companies headquartered in the United States, 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

254Companies

19,378Contacts tracked

2,057Verified emails

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The 25 largest on-demand water heater companies based in the United States

Ranked by team size

Top 25 of 254 on-demand water heater companies based in the United States, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to on-demand water heater 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	A. O. Smith Corporation	Indirect evidence	Milwaukee, WI, United StatesHQ checked Sep 20, 2026	10001+	15,266 contacts →
	Indirect evidence “Celebrating its 150th year of business, A.” Source: RevenueBase Database · checked Sep 20, 2026
2	Bradford White	Strong evidence	Ambler, PA, United StatesHQ checked Sep 20, 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 20, 2026
3	Weil-Mclain	Partial evidence	Burr Ridge, IL, United StatesHQ checked Sep 20, 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 20, 2026
4	Raypak	Partial evidence	Oxnard, United StatesHQ checked Sep 20, 2026	501-1,000	242 contacts →
	Partial evidence “For over 70 years, Raypak has been the world's leading manufacturer of copper finned boilers and heaters.” Source: RevenueBase Database · checked Sep 20, 2026
5	Laars Heating Systems	Indirect evidence	Rochester, NH, United StatesHQ checked Sep 20, 2026	201-500	126 contacts →
	Indirect evidence “Founded in 1948, LAARS serves a diverse base of customers located in many countries across the globe.” Source: RevenueBase Database · checked Sep 20, 2026
6	DRF Water Heating Solutions	Strong evidence	Plainfield, IL, United StatesHQ checked Sep 20, 2026	51-200	109 contacts →
	Strong evidence “DRF Water Heating Solutions mission is to help as many people as we can.” Source: RevenueBase Database · checked Sep 20, 2026
7	Aerco International, INC	Indirect evidence	Blauvelt, NY, United StatesHQ checked Sep 20, 2026	51-200	104 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026
8	PVI Industries	Strong evidence	Fort Worth, TX, United StatesHQ checked Sep 20, 2026	201-500	91 contacts →
	Strong evidence “PVI specializes in medium to large ASME water heaters fabricated from AquaPLEX® duplex stainless steel for commercial and institutional installations such as schools, hotels…” Source: RevenueBase Database · checked Sep 20, 2026
9	Intellihot INC	Partial evidence	Galesburg, IL, United StatesHQ checked Sep 20, 2026	51-200	82 contacts →
	Partial evidence “TRANSFORMATIVE GLOBAL TECHNOLOGY Addressing energy efficiency, health, and safety Intellihot offers high-tech solutions to these water issues and is leading the charge toward a…” Source: RevenueBase Database · checked Sep 20, 2026
10	Noritz America	Strong evidence	Fountain Valley, CA, United StatesHQ checked Sep 20, 2026	51-200	78 contacts →
	Strong evidence “Noritz America Corporation, a subsidiary of Noritz Japan, has corporate offices in Fountain Valley, Calif, and Atlanta, offering a full line of tankless water heaters to meet the…” Source: RevenueBase Database · checked Sep 20, 2026
11	HTP Comfort Solutions	Strong evidence	New Bedford, MA, United StatesHQ checked Sep 20, 2026	51-200	76 contacts →
	Strong evidence “Established in 1974, HTP Comfort Solutions LLC is a full-fledged manufacturer on the cutting edge of energy efficient space and water heating technology.” Source: RevenueBase Database · checked Sep 20, 2026
12	OGI Process Equipment	Strong evidence	Sand Springs, OK, United StatesHQ checked Sep 20, 2026	51-200	56 contacts →
	Strong evidence “OGI (Oil, Gas, and Industrial) Process Equipment designs, manufactures, sells, and services TERI brand indirect fired water bath heaters and QuikWater® brand direct fired water…” Source: RevenueBase Database · checked Sep 20, 2026
13	Eemax, Inc. A Rheem Company	Partial evidence	Waterbury, CT, United StatesHQ checked Sep 20, 2026	51-200	52 contacts →
	Partial evidence “Eemax is leading the evolution of hot water with cutting-edge technology that provides consistent hot water.” Source: RevenueBase Database · checked Sep 20, 2026
14	Triangle Tube	Strong evidence	West Deptford Township, NJ, United StatesHQ checked Sep 20, 2026	11-50	47 contacts →
	Strong evidence “Triangle Tube heating and hot water products have created comfort to families for over 60 years.” Source: RevenueBase Database · checked Sep 20, 2026
15	Steam Solutions	Indirect evidence	New Orleans, LA, United StatesHQ checked Sep 20, 2026	51-200	43 contacts →
	Indirect evidence “Steam Solutions keeps commercial and industrial facilities operating at peak performance through its specialized knowledge of steam systems.” Source: RevenueBase Database · checked Sep 20, 2026
16	Hubbell Heaters	Strong evidence	Stratford, CT, United StatesHQ checked Sep 20, 2026	51-200	42 contacts →
	Strong evidence “Hubbell delivers standard and custom water heating solutions across commercial, marine/offshore, foodservice, and industrial spaces.” Source: RevenueBase Database · checked Sep 20, 2026
17	Water Heaters Only, INC	Strong evidence	Grass Valley, CA, United StatesHQ checked Sep 20, 2026	51-200	40 contacts →
	Strong evidence “Water Heaters Only, Inc specializes in the repair and replacement of water heaters.” Source: RevenueBase Database · checked Sep 20, 2026
18	Nyle Water Heating Systems	Strong evidence	Bangor, ME, United StatesHQ checked Sep 20, 2026	51-200	34 contacts →
	Strong evidence “Leading Manufacturer of Commercial Energy Efficient Heat Pump Water Heating Systems.” Source: RevenueBase Database · checked Sep 20, 2026
19	Benrich Service Company, INC	Indirect evidence	Costa Mesa, CA, United StatesHQ checked Sep 20, 2026	51-200	34 contacts →
	Indirect evidence “Benrich Service Company is a multi-generational family owned business.” Source: RevenueBase Database · checked Sep 20, 2026
20	Monkey Wrench Plumbing, Heating, AIR & Electric	Strong evidence	Monterey Park, CA, United StatesHQ checked Sep 20, 2026	51-200	28 contacts →
	Strong evidence “We are a full-service plumbing, Heating, Air, & Electric company specializing in hot water solutions for residential as well as commercial customers.” Source: RevenueBase Database · checked Sep 20, 2026
21	Heaton Construction, INC	Partial evidence	Roanoke Rapids, NC, United StatesHQ checked Sep 20, 2026	51-200	28 contacts →
	Partial evidence “With 20 years of experience we are focused on delivering quality and professional service.” Source: RevenueBase Database · checked Sep 20, 2026
22	Bock Water Heaters, INC	Strong evidence	Madison, WI, United StatesHQ checked Sep 20, 2026	51-200	26 contacts →
	Strong evidence “Built like a Bock Providing robust, innovative commercial water heaters built by people who care, Bock is the industry leader in water heater product innovations.” Source: RevenueBase Database · checked Sep 20, 2026
23	Aqua-Hot Heating Systems, An Airxcel Brand	Partial evidence	Frederick, CO, United StatesHQ checked Sep 20, 2026	11-50	25 contacts →
	Partial evidence “Aqua-Hot Heating Systems, Inc.” Source: RevenueBase Database · checked Sep 20, 2026
24	Armstrong Plumbing, INC	Indirect evidence	Sacramento, CA, United StatesHQ checked Sep 20, 2026	51-200	23 contacts →
	Indirect evidence “For over half a century, Armstrong Plumbing has been Sacramento's choice for full-service residential and commercial plumbing.” Source: RevenueBase Database · checked Sep 20, 2026
25	Link Mechanical Services, INC	Strong evidence	New Britain, CT, United StatesHQ checked Sep 20, 2026	11-50	17 contacts →
	Strong evidence “Just Call Link for all Your Heating, Cooling & Hot Water Needs: We replace, install, maintain, service, and repair heating, air conditioning, and water heating systems for…” 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: on-demand water heater 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 on-demand water heater companies.
Partial evidence: Its own public description names part of on-demand water heater companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name on-demand water heater 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 254 on-demand water heater companies based in the United States

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On-demand water heater companies based in the United States at a glance

As of Sep 20, 2026

10.6%Verified-email coverage

76.3Average contacts per company

1-10Median size (employees)

2.8%Largest-city concentration · Miami

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

126

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 States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 254 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 on-demand water heater 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 States whose own description of what they do matches “on-demand water heater 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 on-demand water heater 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 on-demand water heater companies, and records with no verified work email. Companies headquartered outside United States 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, 2,057 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 on-demand water heater 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 on-demand water heater companies are there based in the United States?

RevenueBase identified 254 on-demand water heater companies headquartered in the United States 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?

A. O. Smith Corporation, headquartered in Milwaukee, tops this list with the largest team on record.

Which city has the most on-demand water heater companies?

Miami leads with 7 headquartered companies, followed by Atlanta (5) and San Diego (5).

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 2,057 verified decision-maker contacts tracked across these 254 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.