Company lists · Data refreshed September 2026

Top 25 Geothermal equipment system manufacturers based in the United States

Name: Geothermal equipment system 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 267 companies tracked

RevenueBase identified 267 geothermal equipment system manufacturers headquartered in the United States as of September 2026 and tracks 4,286 professional contacts across them, including 1,649 with verified work emails. Houston is the largest hub.

This list covers geothermal equipment system 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

267Companies

4,286Contacts tracked

1,649Verified emails

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The 25 largest geothermal equipment system manufacturers based in the United States

Ranked by team size

Top 25 of 267 geothermal equipment system 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 geothermal equipment system 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	Ormat Technologies, INC	Indirect evidence	Reno, NV, United StatesHQ checked Sep 30, 2026	1,001-5,000	1,281 contacts →
	Indirect evidence “With over five decades of experience, Ormat Technologies, Inc.” Source: RevenueBase Database · checked Sep 30, 2026
2	Waterfurnace International	Indirect evidence	Fort Wayne, IN, United StatesHQ checked Sep 30, 2026	201-500	224 contacts →
	Indirect evidence “WaterFurnace International, Inc.” Source: RevenueBase Database · checked Sep 30, 2026
3	Climatemaster, INC	Partial evidence	Oklahoma City, OK, United StatesHQ checked Sep 30, 2026	501-1,000	178 contacts →
	Partial evidence “ClimateMaster’s role as a domestic energy and geothermal heating and cooling leader extends back to the late 1950s when the company was first founded in Florida.” Source: RevenueBase Database · checked Sep 30, 2026
4	Dandelion Energy	Partial evidence	Mount Kisco, NY, United StatesHQ checked Sep 30, 2026	51-200	118 contacts →
	Partial evidence “Dandelion Energy is the nation’s leading residential geothermal provider, on a mission to make the world’s most efficient heating and cooling technology accessible to everyone.” Source: RevenueBase Database · checked Sep 30, 2026
5	Brightcore Energy	Indirect evidence	Armonk, NY, United StatesHQ checked Sep 30, 2026	51-200	108 contacts →
	Indirect evidence “Brightcore Energy is a leading renewable energy solutions provider serving commercial, institutional, and government clients.” Source: RevenueBase Database · checked Sep 30, 2026
6	Enertech Global, LLC	Strong evidence	Greenville, IL, United StatesHQ checked Sep 30, 2026	51-200	81 contacts →
	Strong evidence “Enertech Global is a leading manufacturer and visionary in the geothermal heating and cooling industry.” Source: RevenueBase Database · checked Sep 30, 2026
7	HTP Comfort Solutions	Partial evidence	New Bedford, MA, United StatesHQ checked Sep 30, 2026	51-200	76 contacts →
	Partial 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
8	Tecogen INC	Strong evidence	North Billerica, MA, United StatesHQ checked Sep 30, 2026	51-200	64 contacts →
	Strong evidence “Tecogen is a leading manufacturer of Combined Heat and Power products including natural gas engine-driven cogeneration, air conditioning systems and high efficiency water heaters…” Source: RevenueBase Database · checked Sep 30, 2026
9	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
10	Allied Well Drilling	Partial evidence	Laurel, MD, United StatesHQ checked Sep 30, 2026	51-200	52 contacts →
	Partial evidence “We at Allied Well Drilling are a full service commercial and residential gethermal heating/cooling system installer, specializing in vertically drilled closed loop systems.” Source: RevenueBase Database · checked Sep 30, 2026
11	Darcy Solutions	Partial evidence	New Brighton, MN, United StatesHQ checked Sep 30, 2026	11-50	38 contacts →
	Partial evidence “Darcy Solutions is on a mission to put Geothermal Everywhere.” Source: RevenueBase Database · checked Sep 30, 2026
12	Nyle Water Heating Systems	Strong evidence	Bangor, ME, United StatesHQ checked Sep 30, 2026	51-200	34 contacts →
	Strong evidence “Leading Manufacturer of Commercial Energy Efficient Heat Pump Water Heating Systems.” Source: RevenueBase Database · checked Sep 30, 2026
13	XGS Energy	Partial evidence	Palo Alto, CA, United StatesHQ checked Sep 30, 2026	11-50	34 contacts →
	Partial evidence “XGS Energy is a geothermal energy company founded and headquartered in Palo Alto, CA.” Source: RevenueBase Database · checked Sep 30, 2026
14	Sagebrush Equipment	Partial evidence	Tulsa, OK, United StatesHQ checked Sep 30, 2026	51-200	33 contacts →
	Partial evidence “Drawing from a proud history of almost 60 years, Sagebrush has unparalleled experience which allows us to bring unique expertise to all facets of the custom fabrication equipment…” Source: RevenueBase Database · checked Sep 30, 2026
15	Power Equipment Company Of Memphis	Strong evidence	Memphis, TN, United StatesHQ checked Sep 30, 2026	11-50	32 contacts →
	Strong evidence “Power Equipment Company (Power Equipment of Memphis) specializes in energy systems and heat generating products, providing the knowledge, products, services and supplies necessary…” Source: RevenueBase Database · checked Sep 30, 2026
16	Sustainable Energy Systems, LLC	Partial evidence	Frederick, MD, United StatesHQ checked Sep 30, 2026	11-50	30 contacts →
	Partial evidence “SES designs, installs, and services solar water heating systems, photovoltaic systems, solar pool heating systems, radiant floor heating systems, and wood-fired boilers.” Source: RevenueBase Database · checked Sep 30, 2026
17	Midwest Geothermal	Strong evidence	Grand Rapids, MI, United StatesHQ checked Sep 30, 2026	11-50	28 contacts →
	Strong evidence “Geothermal Systems are becoming a critical component in the effort to make buildings more environmentally friendly.” Source: RevenueBase Database · checked Sep 30, 2026
18	HOT Water Products, INC	Indirect evidence	Milwaukee, WI, United StatesHQ checked Sep 30, 2026	11-50	28 contacts →
	Indirect evidence “Hot Water Products began in 1998 with a focus on retrofit water heaters, establishing itself as an industry leader from day one.” Source: RevenueBase Database · checked Sep 30, 2026
19	Bedrock Energy	Partial evidence	Austin, TX, United StatesHQ checked Sep 30, 2026	11-50	27 contacts →
	Partial evidence “Our mission is to transform the heating & cooling of buildings, using geothermal energy to radically reduce costs for people and the environment.” Source: RevenueBase Database · checked Sep 30, 2026
20	Diedrich Drill	Strong evidence	La Porte, IN, United StatesHQ checked Sep 30, 2026	11-50	27 contacts →
	Strong evidence “Diedrich Drill is a full service manufacturer of top quality drilling equipment for the geotechnical, environmental, geothermal, and groundwater industries.” Source: RevenueBase Database · checked Sep 30, 2026
21	Arronco Comfort AIR	Indirect evidence	Burlington, KY, United StatesHQ checked Sep 30, 2026	51-200	27 contacts →
	Indirect evidence “Arronco Comfort Air, Inc.” Source: RevenueBase Database · checked Sep 30, 2026
22	Stone Mountain Technologies, INC	Partial evidence	Piney Flats, TN, United StatesHQ checked Sep 30, 2026	11-50	25 contacts →
	Partial evidence “Stone Mountain Technologies, Inc.(SMTI) develops and manufactures high-temperature gas absorption heat pumps under the ANESI® brand.” Source: RevenueBase Database · checked Sep 30, 2026
23	Greenfire Energy INC	Strong evidence	Oklahoma City, OK, United StatesHQ checked Sep 30, 2026	11-50	23 contacts →
	Strong evidence “About GreenFire Energy GreenFire Energy engineers next-generation geothermal systems designed for real-world operating conditions.” Source: RevenueBase Database · checked Sep 30, 2026
24	Symbiont Service Corp	Partial evidence	Englewood, FL, United StatesHQ checked Sep 30, 2026	11-50	23 contacts →
	Partial evidence “Offering high quality, Energy Efficient and Eco-Friendly Geothermal Pool / Spa Heating & Cooling as well as Geothermal Air Conditioning in the whole state of Florida.” Source: RevenueBase Database · checked Sep 30, 2026
25	Open Mountain Energy	Partial evidence	Reno, NV, United StatesHQ checked Sep 30, 2026	11-50	22 contacts →
	Partial evidence “Open Mountain Energy combines its geothermal and project development expertise with Kaishan Group's power plant technologies and manufacturing to form a cutting-edge industry…” 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: geothermal equipment system 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 geothermal equipment system manufacturers.
Partial evidence: Its own public description names part of geothermal equipment system manufacturers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name geothermal equipment system 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 267 geothermal equipment system manufacturers based in the United States

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Geothermal equipment system manufacturers based in the United States at a glance

As of Sep 30, 2026

38.5%Verified-email coverage

16.1Average contacts per company

11-50Median size (employees)

3.7%Largest-city concentration · Houston

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

127

11-50

114

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 267 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 geothermal equipment system 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 “geothermal equipment system 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 geothermal equipment system 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 geothermal equipment system 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, 1,649 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 geothermal equipment system 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 geothermal equipment system manufacturers are there based in the United States?

RevenueBase identified 267 geothermal equipment system 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?

Ormat Technologies, INC, headquartered in Reno, tops this list with the largest team on record.

Which city has the most geothermal equipment system manufacturers?

Houston leads with 10 headquartered companies, followed by Oklahoma City (5) and Austin (4).

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 1,649 verified decision-maker contacts tracked across these 267 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.