Company lists · Data refreshed September 2026

Top 25 Process heating equipment manufacturers based in the United States

Name: Process heating equipment 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 17, 2026 663 companies tracked

RevenueBase identified 663 process heating equipment manufacturers headquartered in the United States as of September 2026 and tracks 21,620 professional contacts across them, including 7,718 with verified work emails. Tulsa is the largest hub.

This list covers process heating equipment 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 17, 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 17, 2026 86% judged on-target in blind review

663Companies

21,620Contacts tracked

7,718Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest process heating equipment manufacturers based in the United States

Ranked by team size

Top 25 of 663 process heating equipment manufacturers based in the United States, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to process heating equipment 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	Aaon, INC	Partial evidence	Tulsa, OK, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,208 contacts →
	Partial evidence “Driving the industry forward through the design, manufacturing, and rigorous testing of premium HVAC equipment.” Source: RevenueBase Database · checked Sep 17, 2026
2	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
3	Chromalox	Partial evidence	Pittsburgh, PA, United StatesHQ checked Sep 17, 2026	1,001-5,000	635 contacts →
	Partial 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 17, 2026
4	Cleaver-Brooks	Partial evidence	Thomasville, GA, United StatesHQ checked Sep 17, 2026	1,001-5,000	631 contacts →
	Partial evidence “Cleaver-Brooks, Inc, a manufacturer of boiler room products for over 90 years, is the only single source manufacturer and supplier of boiler room products including boilers…” Source: RevenueBase Database · checked Sep 17, 2026
5	Evapco, INC	Partial evidence	Taneytown, MD, United StatesHQ checked Sep 17, 2026	1,001-5,000	569 contacts →
	Partial evidence “At EVAPCO, we are more than a manufacturer-we are a global team of employee-owners committed to delivering innovative heat transfer solutions for customers worldwide.” Source: RevenueBase Database · checked Sep 17, 2026
6	Mestek, INC	Strong evidence	Westfield, MA, United StatesHQ checked Sep 17, 2026	501-1,000	449 contacts →
	Strong evidence “Today, Mestek is a family of over 45 specialty manufacturers providing heating, ventilating, and air conditioning products, coil handling equipment, extruded aluminum products…” Source: RevenueBase Database · checked Sep 17, 2026
7	Tranter	Strong evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	501-1,000	442 contacts →
	Strong evidence “Tranter is a global engineering and manufacturing group specializing in thermal management in the process industries, district heating and within the building envelope.” Source: RevenueBase Database · checked Sep 17, 2026
8	Inductotherm Group	Indirect evidence	Rancocas, NJ, United StatesHQ checked Sep 17, 2026	1,001-5,000	375 contacts →
	Indirect evidence “WE BRING HEAT TO METAL.” Source: RevenueBase Database · checked Sep 17, 2026
9	API Heat Transfer	Partial evidence	Buffalo, NY, United StatesHQ checked Sep 17, 2026	1,001-5,000	364 contacts →
	Partial evidence “API Heat Transfer is a leading global provider of heat transfer solutions, recognized for delivering innovative, energy-efficient equipment for more than 140 years.” Source: RevenueBase Database · checked Sep 17, 2026
10	Graham Manufacturing	Strong evidence	Batavia, NY, United StatesHQ checked Sep 17, 2026	201-500	277 contacts →
	Strong evidence “Graham Manufacturing, a GHM Company, designs and builds vacuum and heat transfer equipment for process industries worldwide.” Source: RevenueBase Database · checked Sep 17, 2026
11	Horton, INC	Indirect evidence	Roseville, MN, United StatesHQ checked Sep 17, 2026	201-500	267 contacts →
	Indirect evidence “As a global leader in thermal control for power systems, Horton® offers a variety of technologies for transportation and industrial applications to operate at the optimal…” Source: RevenueBase Database · checked Sep 17, 2026
12	Raypak	Partial evidence	Oxnard, United StatesHQ checked Sep 17, 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 17, 2026
13	Ajaxtocco Magnethermic	Strong evidence	Warren, OH, United StatesHQ checked Sep 17, 2026	201-500	234 contacts →
	Strong evidence “Ajax TOCCO Magnethermic® designs and manufactures world class induction heating and melting equipment for various industries and applications throughout the world.” Source: RevenueBase Database · checked Sep 17, 2026
14	Durex Industries	Indirect evidence	Cary, IL, United StatesHQ checked Sep 17, 2026	201-500	232 contacts →
	Indirect evidence “Durex Industries has over 40 years of excellence in designing and manufacturing custom thermal solutions.” Source: RevenueBase Database · checked Sep 17, 2026
15	Thermal Engineering International USA INC	Partial evidence	La Palma, CA, United StatesHQ checked Sep 17, 2026	201-500	219 contacts →
	Partial evidence “At TEi, we help the power and process industries operate safely, sustainably, and without costly downtime.” Source: RevenueBase Database · checked Sep 17, 2026
16	BTU International	Strong evidence	Westford, MA, United StatesHQ checked Sep 17, 2026	201-500	218 contacts →
	Strong evidence “BTU International, a wholly-owned subsidiary of Amtech Group (Nasdaq: ASYS), is a global supplier and technology leader of advanced thermal processing equipment solutions in the…” Source: RevenueBase Database · checked Sep 17, 2026
17	Nooter Eriksen, INC	Indirect evidence	St. Louis, MO, United StatesHQ checked Sep 17, 2026	201-500	198 contacts →
	Indirect evidence “Nooter/Eriksen, the world's leading independent supplier of Natural Circulation Heat Recovery Steam Generators (HRSG) behind gas turbines, is a single source supplier of custom…” Source: RevenueBase Database · checked Sep 17, 2026
18	Analytic Stress Relieving LLC	Indirect evidence	Lafayette, LA, United StatesHQ checked Sep 17, 2026	201-500	190 contacts →
	Indirect evidence “Analytic Stress made a commitment to quality, safety, and the customer when the company started in the Fall of 1979.” Source: RevenueBase Database · checked Sep 17, 2026
19	Advanced Cooling Technologies, INC	Indirect evidence	Lancaster, PA, United StatesHQ checked Sep 17, 2026	201-500	190 contacts →
	Indirect evidence “What We Do ACT develops passive and active thermal solutions for demanding environments where performance margins are tight and failure is costly.” Source: RevenueBase Database · checked Sep 17, 2026
20	Therm-X, California	Indirect evidence	Hayward, CA, United StatesHQ checked Sep 17, 2026	201-500	189 contacts →
	Indirect evidence “Established in 1983, Therm-x takes pride in delivering thermal solutions incorporating our vertical integration capabilities including; Thermal Design and Test, CNC Machining…” Source: RevenueBase Database · checked Sep 17, 2026
21	Ljungström	Indirect evidence	Wellsville, NY, United StatesHQ checked Sep 17, 2026	1,001-5,000	184 contacts →
	Indirect evidence “LJUNGSTRÖM is a global leader in heat transfer, energy technology, and advanced manufacturing, delivering engineered solutions that improve performance, reliability, and…” Source: RevenueBase Database · checked Sep 17, 2026
22	Fulton	Partial evidence	Pulaski, NY, United StatesHQ checked Sep 17, 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 17, 2026
23	AKG Of America	Partial evidence	Mebane, NC, United StatesHQ checked Sep 17, 2026	1,001-5,000	169 contacts →
	Partial evidence “Since 1919, the AKG Group has been a leading manufacturer of heat exchangers.” Source: RevenueBase Database · checked Sep 17, 2026
24	Marley Engineered Products	Partial evidence	Bennettsville, SC, United StatesHQ checked Sep 17, 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 17, 2026
25	Bard Manufacturing Company, INC	Indirect evidence	Bryan, OH, United StatesHQ checked Sep 17, 2026	501-1,000	166 contacts →
	Indirect evidence “Bard Manufacturing is a fourth-generation family-owned business founded in 1914 in Bryan, Ohio.” 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: process heating equipment 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 process heating equipment manufacturers.
Partial evidence: Its own public description names part of process heating equipment manufacturers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name process heating equipment 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 663 process heating equipment manufacturers based in the United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 7,718 reachable decision-makers.

Free signup · no credit card

View the full list →

Process heating equipment manufacturers based in the United States at a glance

As of Sep 17, 2026

35.7%Verified-email coverage

32.6Average contacts per company

11-50Median size (employees)

3.2%Largest-city concentration · Tulsa

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

211

11-50

236

51-200

149

201-500

501-1,000

1,001-5,000

5,001-10,000

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 663 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 process heating equipment 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 “process heating equipment 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 process heating equipment 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 process heating equipment 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, 7,718 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.

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 process heating equipment 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 process heating equipment manufacturers are there based in the United States?

RevenueBase identified 663 process heating equipment 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?

Aaon, INC, headquartered in Tulsa, tops this list with the largest team on record.

Which city has the most process heating equipment manufacturers?

Tulsa leads with 21 headquartered companies, followed by Houston (16) and Cincinnati (7).

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 7,718 verified decision-maker contacts tracked across these 663 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.

Ready to reach these companies? Verified emails and direct dials for all 663 process heating equipment manufacturers based in the United States. Start with a free account, no credit card.

Download this list →

Related lists

Process heating equipment manufacturers by geography

Browse the directory

Browse: Companies home · All United States lists · All Process heating equipment manufacturers lists · New lists

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.