Company lists · Data refreshed September 2026
Top 25 Solar thermal energy companies based in Austria
RevenueBase identified 92 solar thermal energy companies headquartered in Austria as of September 2026 and tracks 412 professional contacts across them, including 138 with verified work emails. Wien is the largest hub.
This list covers solar thermal energy companies headquartered in Austria, 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 18, 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.
The 25 largest solar thermal energy companies based in Austria
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 39 contacts → | ||||
Strong evidence “We’re building Austria’s fastest-growing clean energy company, combining technology, process excellence, and hands-on execution to make renewable heating and solar power radically…” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 2 | 27 contacts → | ||||
Strong evidence “SOLID brings together extraordinary knowledge, experience in market application and R&D in areas of planning and operation of large-scale solar thermal energy systems and solar…” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 3 | 25 contacts → | ||||
Indirect evidence “A complete heating concept solution is presented in a Heliotherm heat pump system.” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 4 | 24 contacts → | ||||
Partial evidence “beyond carbon energy konzipiert, plant, realisiert, finanziert und betreibt weitestgehend emissionsfreie Wärme- und Kälteversorgung für Bestands- und Neubauimmobilien.” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 5 | 24 contacts → | ||||
Strong evidence “As a leading specialist in solar energy since 1993, based in St.” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 6 | 15 contacts → | ||||
Partial evidence “ECOTHERM - The leading brand for individual hot water, steam and solar systems for hotels, hospitals and industrial applications.” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 7 | 11 contacts → | ||||
Indirect evidence “PWE System GmbH is a company based out of Franz-zola-straße 5, Wels, Oberösterreich, Austria.” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 8 | 9 contacts → | ||||
Strong evidence “Sunlumo is new - a green technology company with a focus on solar energy.” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 9 | 8 contacts → | ||||
Indirect evidence “Seit der Gründung im Jahr 1992 hat sich technisch viel verändert - unser Leitbild ist jedoch dasselbe geblieben.” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 10 | 6 contacts → | ||||
Indirect evidence “Ökosolar ist ein führender Anbieter im Bereich Photovoltaik mit einer klaren Mission: die breite Nutzung von erneuerbarer Sonnenenergie mithilfe von qualitativ hochwertigen…” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 11 | 5 contacts → | ||||
Strong evidence “Holz die Sonne ins Haus versteht sich als Netzwerk für Erneuerbare Energieformen, thermische Solaranlagen, Photovoltaik, Scheitholz, Hackschnitzel, Pellets, Wärmepumpen…” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 12 | 5 contacts → | ||||
Indirect evidence “Wir bieten schlüsselfertige Photovoltaik-Anlagen und Wärmepumpen für Gewerbebetriebe, Logistikdienstleister, Mehrparteienhäuser und Einfamilienhäuser.” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 13 | 4 contacts → | ||||
Partial evidence “ertex solar is a flexible team of specialists with 70 years of experience in glass construction.” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 14 | 3 contacts → | ||||
Partial evidence “M-TEC setzt sich seit 5 Jahrzehnten für die effiziente Nutzung erneuerbarer Energie ein.” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 15 | 3 contacts → | ||||
Partial evidence “Haider Energies ist Ihr kompetenter Ansprechpartner im Bereich Photovoltaik Anlagen.” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 16 | 2 contacts → | ||||
Indirect evidence “Karner Haustechnik steht für moderne Gebäudetechnik mit Hausverstand.” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 17 | 2 contacts → | ||||
Partial evidence “Willkommen bei EA Holding GmbH - Ihrem Experten für Kälte, Wärme und erneuerbare Energien!” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 18 | 2 contacts → | ||||
Indirect evidence “Die Karl Flanyek GmbH ist ein traditions- und qualitätsbewusster Haustechnik-Dienstleister mit Firmensitz im Herzen von Stainz.” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 19 | 2 contacts → | ||||
Partial evidence “Pro Solar ist spezialisiert auf die Installation von Photovoltaikanlagen für Privat- und Geschäftskunden.” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 20 | 2 contacts → | ||||
Partial evidence “Das Installationsunternehmen Auer in Fulpmes mit mehr als 70 Jahren Erfahrung im Bereich Heizung, Sanitär, Lüftung & Solar bietet Konzeption, Planung und Montage von Haustechnik…” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 21 | 2 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 22 | 1 contacts → | ||||
Indirect evidence “Wir sind ein in Tirol ansässiges, junges und motiviertes Unternehmen, welches sich auf neue Technologien der Alternativenergie wie Erdwärme, Luftwärmepumpen, kontrollierte…” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 23 | 1 contacts → | ||||
Indirect evidence “Die Experten für eine sparsame, ökologische und zuverlässige Heizung.” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 24 | 1 contacts → | ||||
Partial evidence “Projekte im Bereich erneuerbare Energie mit den Schwerpunkten: Geothermiesysteme, PV, Heiz- und Kühlsysteme, Großwärmepumpen.” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 25 | 1 contacts → | ||||
Indirect evidence “Unsere Expertise im Bereich Photovoltaik ermöglicht es uns, optimale Anlagen zu entwickeln, die exakte auf Ihre Bedürfnisse zugeschnitten sind.” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
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: solar thermal energy companies. 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 solar thermal energy companies.
- Partial evidence
- Its own public description names part of solar thermal energy companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name solar thermal energy companies. 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 92 solar thermal energy companies based in Austria
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Solar thermal energy companies based in Austria at a glance
As of Sep 18, 2026Companies by employee count
Email recency for this list is measured worldwide rather than for Austria, so it is reported there. Company counts and contact totals on this page are exact for Austria, over 92 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 solar thermal energy companies, 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 Austria whose own description of what they do matches “solar thermal energy companies”. 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 solar thermal energy companies), 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 solar thermal energy companies, and records with no verified work email. Companies headquartered outside Austria 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, 138 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 18, 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 solar thermal energy companies, 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 solar thermal energy companies are there based in Austria?
RevenueBase identified 92 solar thermal energy companies headquartered in Austria 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?
Heizma, headquartered in Vienna, tops this list with the largest team on record.
Which city has the most solar thermal energy companies?
Wien leads with 4 headquartered companies, followed by Amstetten (3) and Dornbirn (3).
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 138 verified decision-maker contacts tracked across these 92 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 18, 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.
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