Company lists · Data refreshed September 2026

Top 25 Electric heater manufacturers based in the United States

Name: Electric heater manufacturers based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 30, 2026 205 companies tracked

RevenueBase identified 205 electric heater manufacturers headquartered in the United States as of September 2026 and tracks 6,227 professional contacts across them, including 2,566 with verified work emails. Miami is the largest hub.

This list covers electric heater manufacturers 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 30, 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 30, 2026 86% judged on-target in blind review

205Companies

6,227Contacts tracked

2,566Verified emails

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The 25 largest electric heater manufacturers based in the United States

Ranked by team size

Top 25 of 205 electric heater manufacturers based in the United States, ranked by team size, largest first. Data refreshed Sep 30, 2026. RevenueBase Smart Search rates how each company's information relates to electric heater manufacturers: 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	Thermon	Partial evidence	Austin, TX, United StatesHQ checked Sep 30, 2026	1,001-5,000	901 contacts →
	Partial 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 30, 2026
2	Bradford White	Strong evidence	Ambler, PA, United StatesHQ checked Sep 30, 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 30, 2026
3	Chromalox	Strong evidence	Pittsburgh, PA, United StatesHQ checked Sep 30, 2026	1,001-5,000	635 contacts →
	Strong evidence “When industrial operations depend on heat that simply cannot fail, Chromalox brings unmatched technical knowledge and high‑performance electric heating solutions that stand the…” Source: RevenueBase Database · checked Sep 30, 2026
4	Weil-Mclain	Strong evidence	Burr Ridge, IL, United StatesHQ checked Sep 30, 2026	501-1,000	279 contacts →
	Strong 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 30, 2026
5	Raypak	Strong evidence	Oxnard, United StatesHQ checked Sep 30, 2026	501-1,000	242 contacts →
	Strong evidence “For over 70 years, Raypak has been the world's leading manufacturer of copper finned boilers and heaters.” Source: RevenueBase Database · checked Sep 30, 2026
6	Fulton	Partial evidence	Pulaski, NY, United StatesHQ checked Sep 30, 2026	501-1,000	171 contacts →
	Partial evidence “Fulton specializes in custom engineered industrial and commercial heating systems featuring steam boilers, hot water and hydronic boilers, thermal fluid heaters, and a full range…” Source: RevenueBase Database · checked Sep 30, 2026
7	Marley Engineered Products	Partial evidence	Bennettsville, SC, United StatesHQ checked Sep 30, 2026	201-500	167 contacts →
	Partial evidence “Marley Engineered Products® draws upon a long history of providing reliable comfort heating and ventilation solutions.” Source: RevenueBase Database · checked Sep 30, 2026
8	Empire Comfort Systems	Indirect evidence	Belleville, IL, United StatesHQ checked Sep 30, 2026	201-500	126 contacts →
	Indirect evidence “Empire Comfort Systems: A Company Perspective · Family Owned Since 1932 · A Full Line of Gas-Fired Products for the Independent Dealer · Made in the USA Empire – a Family-Owned…” Source: RevenueBase Database · checked Sep 30, 2026
9	Laars Heating Systems	Indirect evidence	Rochester, NH, United StatesHQ checked Sep 30, 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 30, 2026
10	ECR International	Indirect evidence	Utica, United StatesHQ checked Sep 30, 2026	201-500	126 contacts →
	Indirect evidence “ECR International, Inc.” Source: RevenueBase Database · checked Sep 30, 2026
11	TUTCO	Partial evidence	Cookeville, TN, United StatesHQ checked Sep 30, 2026	1,001-5,000	119 contacts →
	Partial evidence “Founded in 1938, Tutco has quickly grown into a global leader in the heating component industry.” Source: RevenueBase Database · checked Sep 30, 2026
12	HTP Comfort Solutions	Strong evidence	New Bedford, MA, United StatesHQ checked Sep 30, 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 30, 2026
13	Sigma Thermal, INC	Partial evidence	Marietta, GA, United StatesHQ checked Sep 30, 2026	51-200	75 contacts →
	Partial evidence “Sigma Thermal designs, engineers, supplies, and services process heating systems for industry.” Source: RevenueBase Database · checked Sep 30, 2026
14	Tempco Electric Heater Corporation	Strong evidence	Wood Dale, IL, United StatesHQ checked Sep 30, 2026	201-500	75 contacts →
	Strong evidence “Founded in 1972, Tempco is a trusted manufacturer and designer specializing in high-quality electric heating elements, temperature sensors, and power control products for…” Source: RevenueBase Database · checked Sep 30, 2026
15	King Electrical Mfg. CO	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 30, 2026	51-200	72 contacts →
	Indirect evidence “Why King?” Source: RevenueBase Database · checked Sep 30, 2026
16	Heatec, An Astec Brand	Strong evidence	Chattanooga, TN, United StatesHQ checked Sep 30, 2026	201-500	71 contacts →
	Strong evidence “Manufacturer of heaters, tanks and related products for a wide variety of industries.” Source: RevenueBase Database · checked Sep 30, 2026
17	United States Stove Company	Indirect evidence	South Pittsburg, TN, United StatesHQ checked Sep 30, 2026	51-200	70 contacts →
	Indirect evidence “Since the company began in 1869, U.S.” Source: RevenueBase Database · checked Sep 30, 2026
18	Warmboard INC	Indirect evidence	Scotts Valley, CA, United StatesHQ checked Sep 30, 2026	51-200	63 contacts →
	Indirect evidence “Warmboard, Inc.” Source: RevenueBase Database · checked Sep 30, 2026
19	Nexthermal	Strong evidence	Battle Creek, MI, United StatesHQ checked Sep 30, 2026	51-200	58 contacts →
	Strong evidence “Nexthermal is a collaborative electric heater manufacturing company that focuses its passion and energy toward custom designing electric heaters, systems and assemblies.” Source: RevenueBase Database · checked Sep 30, 2026
20	OGI Process Equipment	Strong evidence	Sand Springs, OK, United StatesHQ checked Sep 30, 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 30, 2026
21	Gaumer Process	Strong evidence	Houston, TX, United StatesHQ checked Sep 30, 2026	51-200	54 contacts →
	Strong evidence “Gaumer Process is a leading designer and manufacturer of electric heaters, controls and engineered systems for the power generation and oil & gas industries.” Source: RevenueBase Database · checked Sep 30, 2026
22	LB White Company	Indirect evidence	Onalaska, WI, United StatesHQ checked Sep 30, 2026	51-200	54 contacts →
	Indirect evidence “L.B.” Source: RevenueBase Database · checked Sep 30, 2026
23	Eemax, Inc. A Rheem Company	Indirect evidence	Waterbury, CT, United StatesHQ checked Sep 30, 2026	51-200	52 contacts →
	Indirect evidence “Eemax is leading the evolution of hot water with cutting-edge technology that provides consistent hot water.” Source: RevenueBase Database · checked Sep 30, 2026
24	Warmlyyours	Partial evidence	Lake Zurich, IL, United StatesHQ checked Sep 30, 2026	11-50	50 contacts →
	Partial evidence “WarmlyYours is a fast-growing firm in Chicago providing radiant heating solutions.” Source: RevenueBase Database · checked Sep 30, 2026
25	Triangle Tube	Partial evidence	West Deptford Township, NJ, United StatesHQ checked Sep 30, 2026	11-50	47 contacts →
	Partial evidence “Triangle Tube heating and hot water products have created comfort to families for over 60 years.” Source: RevenueBase Database · checked Sep 30, 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: electric heater manufacturers. 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 electric heater manufacturers.
Partial evidence: Its own public description names part of electric heater manufacturers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name electric heater manufacturers. 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 205 electric heater manufacturers based in the United States

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Electric heater manufacturers based in the United States at a glance

As of Sep 30, 2026

41.2%Verified-email coverage

30.4Average contacts per company

11-50Median size (employees)

1.5%Largest-city concentration · Miami

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

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 205 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 electric heater manufacturers, 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 “electric heater manufacturers”. 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 electric heater manufacturers), 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 electric heater manufacturers, 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, 2,566 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 30, 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 electric heater manufacturers, 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 electric heater manufacturers are there based in the United States?

RevenueBase identified 205 electric heater manufacturers 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?

Thermon, headquartered in Austin, tops this list with the largest team on record.

Which city has the most electric heater manufacturers?

Miami leads with 3 headquartered companies, followed by Aberdeen (2) and Atlanta (2).

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 2,566 verified decision-maker contacts tracked across these 205 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 30, 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.