Company lists · Data refreshed September 2026

Top 25 Geothermal equipment suppliers based in Germany

Name: Geothermal equipment suppliers based in Germany
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 424 companies tracked

RevenueBase identified 424 geothermal equipment suppliers headquartered in Germany as of September 2026 and tracks 7,724 professional contacts across them, including 2,534 with verified work emails. Berlin is the largest hub.

This list covers geothermal equipment suppliers headquartered in Germany, 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

424Companies

7,724Contacts tracked

2,534Verified emails

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The 25 largest geothermal equipment suppliers based in Germany

Ranked by team size

Top 25 of 424 geothermal equipment suppliers based in Germany, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to geothermal equipment suppliers: 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	Vaillant Group	Indirect evidence	Remscheid, GermanyHQ checked Sep 20, 2026	10001+	3,014 contacts →
	Indirect evidence “Our corporate vision shapes everything we do and inspires our employees every day.” Source: RevenueBase Database · checked Sep 20, 2026
2	Stiebel Eltron Group	Indirect evidence	Holzminden, GermanyHQ checked Sep 20, 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 20, 2026
3	Daikin Airconditioning Germany Gmbh	Indirect evidence	Unterhaching, GermanyHQ checked Sep 20, 2026	501-1,000	253 contacts →
	Indirect evidence “DAIKIN ist weltweit führender Hersteller von Wärmepumpen, Lüftungs- und Klimatisierungssystemen.” Source: RevenueBase Database · checked Sep 20, 2026
4	August Brötje Gmbh	Indirect evidence	Rastede, GermanyHQ checked Sep 20, 2026	201-500	112 contacts →
	Indirect evidence “BRÖTJE efficient heating system technology.” Source: RevenueBase Database · checked Sep 20, 2026
5	Pewo Energietechnik Gmbh	Indirect evidence	Elsterheide, GermanyHQ checked Sep 20, 2026	201-500	100 contacts →
	Indirect evidence “Mit innovativer Technik zur Übergabe und Verteilung von Wärme auf der entscheidenden „letzten Meile“ vereinfacht und beschleunigt PEWO die Integration regenerativer Energiequellen.” Source: RevenueBase Database · checked Sep 20, 2026
6	Ait-Deutschland Gmbh	Indirect evidence	Kasendorf, GermanyHQ checked Sep 20, 2026	1,001-5,000	86 contacts →
	Indirect evidence “Heat pumps are part of our DNA 🧬 Our vision is an ideal tomorrow - independent of fossil energy sources You too can become part of ait Since 1998, we have been helping to protect…” Source: RevenueBase Database · checked Sep 20, 2026
7	VAMO	Indirect evidence	Cologne, GermanyHQ checked Sep 20, 2026	51-200	84 contacts →
	Indirect evidence “Wir bei Vamo haben es uns zur Mission gemacht grünes, günstiges Heizen mit Wärmepumpen unkompliziert und für jedermann möglich sowie bezahlbar zu machen.” Source: RevenueBase Database · checked Sep 20, 2026
8	Oni-Wärmetrafo Gmbh	Indirect evidence	Lindlar, GermanyHQ checked Sep 20, 2026	201-500	72 contacts →
	Indirect evidence “Seit über vier Jahrzehnten setzen Kunden auf innovative Energiespartechnik aus dem Hause ONI.” Source: RevenueBase Database · checked Sep 20, 2026
9	Danpower-Gruppe	Indirect evidence	Potsdam, GermanyHQ checked Sep 20, 2026	201-500	67 contacts →
	Indirect evidence “Die Danpower-Gruppe ist ein mittelständisch strukturiertes Wärmeversorgungs- und Contractingunternehmen.” Source: RevenueBase Database · checked Sep 20, 2026
10	Baugrund SÜD Gesellschaft FÜR Geothermie MBH	Partial evidence	Bad Wurzach, GermanyHQ checked Sep 20, 2026	51-200	50 contacts →
	Partial evidence “BauGrund Süd Gesellschaft für Geothermie mbH is an utilities company based out of MAYBACHSTRASSE 5, Bad Wurzach, Germany.” Source: RevenueBase Database · checked Sep 20, 2026
11	Güntner	Indirect evidence	Furstenfeldbruck, GermanyHQ checked Sep 20, 2026	1,001-5,000	45 contacts →
	Indirect evidence “SOLVE TOMORROW'S CHALLENGES TODAY At Güntner, we combine maximum precision in everyday life with a vision for the future in order to provide our partners with the best possible…” Source: RevenueBase Database · checked Sep 20, 2026
12	Envola	Indirect evidence	Ulm, GermanyHQ checked Sep 20, 2026	11-50	37 contacts →
	Indirect evidence “The Envola System is an innovative, holistic and most sustainable approach to enable smart and efficient HVAC solutions for buildings.” Source: RevenueBase Database · checked Sep 20, 2026
13	Wegatech	Indirect evidence	Köln, GermanyHQ checked Sep 20, 2026	51-200	37 contacts →
	Indirect evidence “heimWatt hat Ende Januar 2025 u.a.” Source: RevenueBase Database · checked Sep 20, 2026
14	Remeha	Indirect evidence	Saerbeck, GermanyHQ checked Sep 20, 2026	51-200	34 contacts →
	Indirect evidence “Mit smarten Qualitätsprodukten, persönlichem Service und exakt passenden Lösungen bringen wir genau das richtige Maß an Wärme zu unseren Kunden.” Source: RevenueBase Database · checked Sep 20, 2026
15	Waterkotte Gmbh	Indirect evidence	Herne, GermanyHQ checked Sep 20, 2026	51-200	32 contacts →
	Indirect evidence “Die WATERKOTTE GmbH ist mit über 50 Jahren Erfahrung als Hersteller nachhaltiger Energiesysteme auf Basis der Wärmepumpe ein Pionier der Branche.” Source: RevenueBase Database · checked Sep 20, 2026
16	Enerpipe Gmbh	Indirect evidence	Hilpoltstein, GermanyHQ checked Sep 20, 2026	51-200	30 contacts →
	Indirect evidence “ENERPIPE GmbH steht für innovative, energiesparende Wärmesysteme, die für die Energiewende viele Vorteile bieten.” Source: RevenueBase Database · checked Sep 20, 2026
17	Daldrup & Söhne AG	Indirect evidence	Ascheberg, GermanyHQ checked Sep 20, 2026	51-200	28 contacts →
	Indirect evidence “Die Daldrup & Söhne AG ist Spezialist für Bohrtechnik und die Erschließung geologischer Ressourcen in Deutschland mit Sitz in Ascheberg, Nordrhein-Westfalen.” Source: RevenueBase Database · checked Sep 20, 2026
18	GWE Group	Partial evidence	Peine, GermanyHQ checked Sep 20, 2026	201-500	24 contacts →
	Partial evidence “Die GERMAN WATER and ENERGY GROUP (GWE) ist Hersteller richtungsweisender Produkte und Entwickler integrierter Anwendungen für den Brunnenbau und die Geothermie.” Source: RevenueBase Database · checked Sep 20, 2026
19	Tecalor Gmbh	Indirect evidence	Holzminden, GermanyHQ checked Sep 20, 2026	51-200	24 contacts →
	Indirect evidence “tecalor ist Systemanbieter für Haustechnik.” Source: RevenueBase Database · checked Sep 20, 2026
20	IEP Innovative Energie FÜR Pullach Gmbh	Partial evidence	Pullach Im Isartal, GermanyHQ checked Sep 20, 2026	11-50	23 contacts →
	Partial evidence “IEP Innovative Energie für Pullach GmbH is a geothermal and district heating operator based in Pullach im Isartal, Germany.” Source: RevenueBase Database · checked Sep 20, 2026
21	Calor Energy	Indirect evidence	Hamburg, GermanyHQ checked Sep 20, 2026	11-50	22 contacts →
	Indirect evidence “CALOR ENERGY is a Germany-wide partner for integrated and economically viable energy solutions across residential real estate, commercial properties, and private investment…” Source: RevenueBase Database · checked Sep 20, 2026
22	Deutsche Erdwärme	Indirect evidence	Karlsruhe, GermanyHQ checked Sep 20, 2026	11-50	21 contacts →
	Indirect evidence “Deutsche ErdWärme entwickelt, baut, finanziert und betreibt Erdwärmeanlagen zur Dekarbonisierung von Wärmenetzen.” Source: RevenueBase Database · checked Sep 20, 2026
23	Geothermie Neubrandenburg Gmbh	Partial evidence	Neubrandenburg, GermanyHQ checked Sep 20, 2026	11-50	21 contacts →
	Partial evidence “Geothermie Neubrandenburg GmbH (GTN) is an internationally active consultancy and planning office of engineers and geoscientsits.” Source: RevenueBase Database · checked Sep 20, 2026
24	Heat 11 Gmbh & Co. KG	Indirect evidence	Bielefeld, GermanyHQ checked Sep 20, 2026	51-200	21 contacts →
	Indirect evidence “Our commitment: Heat transfer in perfection!” Source: RevenueBase Database · checked Sep 20, 2026
25	SES Energiesysteme Gmbh WIR Bauen Wärme	Indirect evidence	Berlin, GermanyHQ checked Sep 20, 2026	51-200	20 contacts →
	Indirect evidence “Mittelständisches, solides Unternehmen für sichere und klimaschonende Energieversorgung - immer auf der Suche nach engagierten Kolleginnen und Kollegen!” 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: geothermal equipment suppliers. 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 suppliers.
Partial evidence: Its own public description names part of geothermal equipment suppliers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name geothermal equipment suppliers. 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 424 geothermal equipment suppliers based in Germany

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Geothermal equipment suppliers based in Germany at a glance

As of Sep 20, 2026

32.8%Verified-email coverage

18.2Average contacts per company

11-50Median size (employees)

3.8%Largest-city concentration · Berlin

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

189

11-50

136

51-200

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 Germany, so it is reported there. Company counts and contact totals on this page are exact for Germany, over 424 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 suppliers, 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 Germany whose own description of what they do matches “geothermal equipment suppliers”. 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 suppliers), 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 suppliers, and records with no verified work email. Companies headquartered outside Germany 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, 2,534 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 geothermal equipment suppliers, 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 suppliers are there based in Germany?

RevenueBase identified 424 geothermal equipment suppliers headquartered in Germany 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?

Vaillant Group, headquartered in Remscheid, tops this list with the largest team on record.

Which city has the most geothermal equipment suppliers?

Berlin leads with 16 headquartered companies, followed by Hamburg (7) and Dortmund (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 2,534 verified decision-maker contacts tracked across these 424 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.