Company lists · Data refreshed September 2026

Top 25 Geothermal system designers based in Germany

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

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 377 companies tracked

RevenueBase identified 377 geothermal system designers headquartered in Germany as of September 2026 and tracks 1,168 professional contacts across them, including 305 with verified work emails. Berlin is the largest hub.

This list covers geothermal system designers 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 19, 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 19, 2026 86% judged on-target in blind review

377Companies

1,168Contacts tracked

305Verified emails

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The 25 largest geothermal system designers based in Germany

Ranked by team size

Top 25 of 377 geothermal system designers based in Germany, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to geothermal system designers: 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	Baugrund SÜD Gesellschaft FÜR Geothermie MBH	Partial evidence	Bad Wurzach, GermanyHQ checked Sep 19, 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 19, 2026
2	Waterkotte Gmbh	Indirect evidence	Herne, GermanyHQ checked Sep 19, 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 19, 2026
3	PAW Gmbh & Co. KG	Indirect evidence	Hameln, GermanyHQ checked Sep 19, 2026	51-200	28 contacts →
	Indirect evidence “Seit über 55 Jahren arbeiten wir an intelligenten und maßgeschneiderten Lösungen für unsere Kunden, die optimal die Kundenbedürfnisse erfüllen.” Source: RevenueBase Database · checked Sep 19, 2026
4	Daldrup & Söhne AG	Indirect evidence	Ascheberg, GermanyHQ checked Sep 19, 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 19, 2026
5	Calor Energy	Indirect evidence	Hamburg, GermanyHQ checked Sep 19, 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 19, 2026
6	Geothermie Neubrandenburg Gmbh	Partial evidence	Neubrandenburg, GermanyHQ checked Sep 19, 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 19, 2026
7	Erdwerk Gmbh	Partial evidence	Munich, GermanyHQ checked Sep 19, 2026	11-50	21 contacts →
	Partial evidence “ERDWERK GmbH is an independent planning office offering consulting services in the fields of geothermal energy, geology, hydrogeology, energetics and drilling technology.” Source: RevenueBase Database · checked Sep 19, 2026
8	Goodmen Energy Gmbh	Indirect evidence	Gräfelfing, GermanyHQ checked Sep 19, 2026	11-50	20 contacts →
	Indirect evidence “Die goodmen energy GmbH hat sich auf die Planung und Realisation von Wärme- und Kälte-Versorgung aus regenerativen Quellen spezialisiert.” Source: RevenueBase Database · checked Sep 19, 2026
9	Geoenergie Konzept Gmbh	Partial evidence	Freiberg, GermanyHQ checked Sep 19, 2026	11-50	19 contacts →
	Partial evidence “eine Gesellschaft der ENGIE-Gruppe, ist ein führendes Unternehmen für Wärme- und Kältelösungen im Bereich der Oberflächennahen Geothermie.” Source: RevenueBase Database · checked Sep 19, 2026
10	Yanmar Energy System Europe Gmbh	Indirect evidence	45768 Marl, GermanyHQ checked Sep 19, 2026	n/a	18 contacts →
	Indirect evidence “Wir sind Ihr zuverlässiger Komplettanbieter für Kälte, Lüftungs, Kühl- und Heizlösungen in Gewerbe und Industrie.” Source: RevenueBase Database · checked Sep 19, 2026
11	Natelberg Gebäudetechnik Gmbh	Indirect evidence	Rhauderfehn, GermanyHQ checked Sep 19, 2026	11-50	15 contacts →
	Indirect evidence “Natelberg Gebäudetechnik GmbH is a computer networking company based out of 9 Schwarzmoorstraße, Rhauderfehn, Germany.” Source: RevenueBase Database · checked Sep 19, 2026
12	Wibau Haustechnik Gmbh	Indirect evidence	Schwerin, GermanyHQ checked Sep 19, 2026	11-50	14 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
13	TGA Bodensee Gmbh	Indirect evidence	Salem, GermanyHQ checked Sep 19, 2026	51-200	13 contacts →
	Indirect evidence “tga bodensee GmbH ist ein Unternehmen, das die Beratung und Umsetzung von zukunftsweisender Haus- und Energietechnik sowohl für Privat- als auch Gewerbekunden anbietet.” Source: RevenueBase Database · checked Sep 19, 2026
14	Erdwärme Grünwald Gmbh	Indirect evidence	Grünwald, GermanyHQ checked Sep 19, 2026	11-50	9 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
15	H. Maurer Gmbh & Co. KG	Indirect evidence	Schramberg, GermanyHQ checked Sep 19, 2026	51-200	9 contacts →
	Indirect evidence “Heizung - Klima - Sanitär” Source: RevenueBase Database · checked Sep 19, 2026
16	Neowells	Indirect evidence	Berlin, GermanyHQ checked Sep 19, 2026	1-10	9 contacts →
	Indirect evidence “neowells is a German, independent and innovative engineering company with the vision of actively supporting, professionalizing, industrializing and thus accelerating the heat and…” Source: RevenueBase Database · checked Sep 19, 2026
17	Giedorf	Partial evidence	Neuss, GermanyHQ checked Sep 19, 2026	51-200	8 contacts →
	Partial evidence “GIEDORF ist regionaler Meisterbetrieb und Fullservice-Anbieter für Wärmepumpen, Photovoltaiklösungen, Stromspeicher, Klimaanlagen und Energie-Management-Systeme – für Eigenheime…” Source: RevenueBase Database · checked Sep 19, 2026
18	Elektro Drämer Gmbh	Indirect evidence	Recklinghausen, GermanyHQ checked Sep 19, 2026	1-10	8 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
19	Grötsch Energietechnik Gmbh	Indirect evidence	Hersbruck, GermanyHQ checked Sep 19, 2026	51-200	7 contacts →
	Indirect evidence “Egal ob Heizungs, Kälte, Solar- oder Lüftungsanlagen – für diese und einige weitere Bereiche haben wir Spezialisten im Haus, die Sie umfassend in den einzelnen Projektphasen…” Source: RevenueBase Database · checked Sep 19, 2026
20	Tewag Technologie	Indirect evidence	Starzach-felldorf, GermanyHQ checked Sep 19, 2026	11-50	7 contacts →
	Indirect evidence “Unabhängige Sachverständige und Planer verbinden Erkenntnisse aus neuester Forschung, wissenschaftliche Methoden und geologische Erfahrung aus jahrzehntelanger Praxis.” Source: RevenueBase Database · checked Sep 19, 2026
21	Klimatechnik Wagner Gmbh	Indirect evidence	Neusäß, GermanyHQ checked Sep 19, 2026	51-200	7 contacts →
	Indirect evidence “Klimatechnik Wagner GmbH is a company based out of 8 Daimlerstraße, Neusäß, Germany.” Source: RevenueBase Database · checked Sep 19, 2026
22	B&k Energie UND Wärmelösungen Gmbh	Indirect evidence	Berlin, GermanyHQ checked Sep 19, 2026	11-50	7 contacts →
	Indirect evidence “B&K Energie bietet umfassende Expertise und innovative Technologien, um Gebäude effizient und nachhaltig zu gestalten.” Source: RevenueBase Database · checked Sep 19, 2026
23	Wbmax Gmbh	Indirect evidence	Frankfurt, GermanyHQ checked Sep 19, 2026	51-200	7 contacts →
	Indirect evidence “Wbmax GmbH delivers reliable and efficient heating, ventilation, plumbing, and electrical solutions to ensure comfortable, safe, and efficient spaces.” Source: RevenueBase Database · checked Sep 19, 2026
24	Geowell Erdwärme Gmbh & Co.Kg	Indirect evidence	Marl, GermanyHQ checked Sep 19, 2026	51-200	6 contacts →
	Indirect evidence “Geowell Erdwärme GmbH & Co.KG is a construction company based out of 5 Neckarstraße, Marl, Germany.” Source: RevenueBase Database · checked Sep 19, 2026
25	Stiebel Eltron Deutschland Vertriebs Gmbh	Indirect evidence	Eschborn, GermanyHQ checked Sep 19, 2026	1-10	6 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 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 system designers. 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 system designers.
Partial evidence: Its own public description names part of geothermal system designers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name geothermal system designers. 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 377 geothermal system designers based in Germany

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Geothermal system designers based in Germany at a glance

As of Sep 19, 2026

26.1%Verified-email coverage

3.1Average contacts per company

1-10Median size (employees)

4.5%Largest-city concentration · Berlin

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

200

11-50

51-200

201-500

5,001-10,000

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 377 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 system designers, 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 system designers”. 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 system designers), 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 system designers, 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, 305 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 19, 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 system designers, 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 system designers are there based in Germany?

RevenueBase identified 377 geothermal system designers 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?

Baugrund SÜD Gesellschaft FÜR Geothermie MBH, headquartered in Bad Wurzach, tops this list with the largest team on record.

Which city has the most geothermal system designers?

Berlin leads with 17 headquartered companies, followed by Hamburg (7) and Munich (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 305 verified decision-maker contacts tracked across these 377 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 19, 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.