Company lists · Data refreshed September 2026

Top 25 Geothermal system installers based in Belgium

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

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 191 companies tracked

RevenueBase identified 191 geothermal system installers headquartered in Belgium as of September 2026 and tracks 1,042 professional contacts across them, including 420 with verified work emails. Arendonk is the largest hub.

This list covers geothermal system installers headquartered in Belgium, 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

191Companies

1,042Contacts tracked

420Verified emails

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The 25 largest geothermal system installers based in Belgium

Ranked by team size

Top 25 of 191 geothermal system installers based in Belgium, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to geothermal system installers: 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	Belcotec	Indirect evidence	Geel, BelgiumHQ checked Sep 19, 2026	51-200	54 contacts →
	Indirect evidence “Van een uitgebreide analyse, naar de plaatsing en nazorg van uw gebouwtechnieken: bij Belcotec kunt u terecht voor het ontwerp en de volledige uitvoering van al uw HVAC- en…” Source: RevenueBase Database · checked Sep 19, 2026
2	Energyking	Indirect evidence	Herent, BelgiumHQ checked Sep 19, 2026	51-200	53 contacts →
	Indirect evidence “EnergyKing werd in 2013 opgericht door twee ingenieurs: Lucas & Wiet.” Source: RevenueBase Database · checked Sep 19, 2026
3	Sanitechniek	Indirect evidence	Sint-katelijne-waver, BelgiumHQ checked Sep 19, 2026	11-50	37 contacts →
	Indirect evidence “Sanitechniek is dé specialist in professionele HVAC-en sanitaire installaties.” Source: RevenueBase Database · checked Sep 19, 2026
4	Goessens	Partial evidence	Hannut, BelgiumHQ checked Sep 19, 2026	51-200	31 contacts →
	Partial evidence “Goessens est une société spécialisée dans l'installation de systèmes de chauffage, de ventilation et de climatisation.” Source: RevenueBase Database · checked Sep 19, 2026
5	AIR Ambiance SA	Indirect evidence	Battice, BelgiumHQ checked Sep 19, 2026	11-50	28 contacts →
	Indirect evidence “ÉCOLOGIE - ÉCONOMIE - QUALITÉ Air Ambiance a pour mission: de répondre aux besoins de chauffage, de climatisation, de réfrigération et de ventilation en proposant un service…” Source: RevenueBase Database · checked Sep 19, 2026
6	Radson Benelux	Indirect evidence	Zonhoven, BelgiumHQ checked Sep 19, 2026	201-500	27 contacts →
	Indirect evidence “Welcome to the beautiful world of Radson indoor comfort!” Source: RevenueBase Database · checked Sep 19, 2026
7	Group VHC	Indirect evidence	Overijse, BelgiumHQ checked Sep 19, 2026	51-200	24 contacts →
	Indirect evidence “Group VHC zorgt al meer dan 25 jaar voor slimme oplossingen in verwarming, koeling, ventilatie en zonne energie.” Source: RevenueBase Database · checked Sep 19, 2026
8	NOVEN	Indirect evidence	Gent, BelgiumHQ checked Sep 19, 2026	11-50	24 contacts →
	Indirect evidence “Climate change is an urgent reality, and buildings, which are responsible for nearly 40% of the EU's GHG emissions, play a pivotal role.” Source: RevenueBase Database · checked Sep 19, 2026
9	Ecopuur	Indirect evidence	9850, BelgiumHQ checked Sep 19, 2026	11-50	23 contacts →
	Indirect evidence “Ecopuur bekijkt het verbruikspatroon van je huidige of nieuwe woning.” Source: RevenueBase Database · checked Sep 19, 2026
10	Polarsun	Indirect evidence	Barchon, BelgiumHQ checked Sep 19, 2026	11-50	20 contacts →
	Indirect evidence “Chez Polarsun, nous concevons, installons et assurons le suivi de solutions énergétiques durables pour les particuliers, les entreprises et les collectivités.” Source: RevenueBase Database · checked Sep 19, 2026
11	Energieconcepten	Indirect evidence	Arendonk, BelgiumHQ checked Sep 19, 2026	11-50	19 contacts →
	Indirect evidence “Energieconcepten biedt duurzame energieoplossingen voor het verwarmen, ventileren, verlichten, sturen… van gebouwen.” Source: RevenueBase Database · checked Sep 19, 2026
12	Verisol	Partial evidence	Lummen, BelgiumHQ checked Sep 19, 2026	11-50	19 contacts →
	Partial evidence “Verisol is an expert in the installation of cleantech products including photovoltaic solar installations, solar thermal systems, heat pumps, airconditioning systems, isolation en…” Source: RevenueBase Database · checked Sep 19, 2026
13	Stiebel Eltron Belgium	Indirect evidence	Groot-bijgaarden, BelgiumHQ checked Sep 19, 2026	11-50	18 contacts →
	Indirect evidence “Stiebel Eltron is een internationale groep en behoort tot de wereldmarkt- en technologieleiders op het gebied van bouwdiensten en hernieuwbare energie.” Source: RevenueBase Database · checked Sep 19, 2026
14	Metubel	Indirect evidence	Strépy-bracquegnies, BelgiumHQ checked Sep 19, 2026	51-200	17 contacts →
	Indirect evidence “Metubel est une société spécialisée dans la pose et le raccordement des différentes énergies pour les particuliers et les entreprises.” Source: RevenueBase Database · checked Sep 19, 2026
15	Alfasun	Indirect evidence	Ninove, BelgiumHQ checked Sep 19, 2026	11-50	17 contacts →
	Indirect evidence “nergie zonder zorgen Ga je bouwen?” Source: RevenueBase Database · checked Sep 19, 2026
16	Gebo Bvba	Partial evidence	Dessel, BelgiumHQ checked Sep 19, 2026	11-50	15 contacts →
	Partial evidence “GEBO is a drilling company specialised in geothermal drilling.” Source: RevenueBase Database · checked Sep 19, 2026
17	LA Temperature Ideale	Indirect evidence	Charleroi, BelgiumHQ checked Sep 19, 2026	11-50	14 contacts →
	Indirect evidence “LA TEMPERATURE IDEALE Spécialiste de l'installation, de la rénovation et du dépannage de chauffages, nous sommes à même de vous conseiller avant tout travaux que vous désiriez…” Source: RevenueBase Database · checked Sep 19, 2026
18	Ecosol	Indirect evidence	Peer, BelgiumHQ checked Sep 19, 2026	11-50	13 contacts →
	Indirect evidence “Ecosol+ is partner in je zoektocht naar de meest energie-onafhankelijke oplossingen voor HVAC.” Source: RevenueBase Database · checked Sep 19, 2026
19	Naessens Hvac	Indirect evidence	Deerlijk, BelgiumHQ checked Sep 19, 2026	11-50	13 contacts →
	Indirect evidence “Naessens HVAC is installateur van totale HVAC-S projecten, met specialisatie in installatie van warmtepompen en ventilatie.” Source: RevenueBase Database · checked Sep 19, 2026
20	Intellisol	Indirect evidence	Maaseik, BelgiumHQ checked Sep 19, 2026	11-50	12 contacts →
	Indirect evidence “Intellisol is een multitechnisch installatie bedrijf met eigen studiebureau uit Maaseik dat gespecialiseerd is in het ontwerpen en plaatsen van energiezuinige installaties, zonder…” Source: RevenueBase Database · checked Sep 19, 2026
21	Geotherma	Partial evidence	Hoegaarden, BelgiumHQ checked Sep 19, 2026	11-50	12 contacts →
	Partial evidence “GeoTherma gelooft dat alle thermische energienoden in gebouwen en woningen moeten geëlektrificeerd worden met behulp van warmtepompen.” Source: RevenueBase Database · checked Sep 19, 2026
22	Proenergy	Indirect evidence	Ruiselede, BelgiumHQ checked Sep 19, 2026	11-50	11 contacts →
	Indirect evidence “Proenergy is een bedrijf dat in 2010 werd opgericht door Steven Roels, gedreven door een grote passie voor groene energie-installaties zoals zonnepanelen, warmtepompen…” Source: RevenueBase Database · checked Sep 19, 2026
23	Cevek NV	Indirect evidence	Overpelt, BelgiumHQ checked Sep 19, 2026	11-50	9 contacts →
	Indirect evidence “Installatiepartner en Limburgs vakmanschap sinds 1972.” Source: RevenueBase Database · checked Sep 19, 2026
24	Dauvister	Partial evidence	Stavelot, BelgiumHQ checked Sep 19, 2026	51-200	9 contacts →
	Partial evidence “Dauvister (170+ employees, 30M€ turnover) studies, installs and maintains energy efficency systems for homeowners as well as for large companies.” Source: RevenueBase Database · checked Sep 19, 2026
25	Esp-Projects	Indirect evidence	Lombardsijde, BelgiumHQ checked Sep 19, 2026	11-50	8 contacts →
	Indirect evidence “ESP-Projects is a construction company based out of Lombardsijde, Middelkerke, Belgium.” 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 installers. 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 installers.
Partial evidence: Its own public description names part of geothermal system installers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name geothermal system installers. 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 191 geothermal system installers based in Belgium

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Geothermal system installers based in Belgium at a glance

As of Sep 19, 2026

40.3%Verified-email coverage

5.5Average contacts per company

1-10Median size (employees)

3.1%Largest-city concentration · Arendonk

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

122

11-50

51-200

201-500

Email recency for this list is measured worldwide rather than for Belgium, so it is reported there. Company counts and contact totals on this page are exact for Belgium, over 191 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 installers, 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 Belgium whose own description of what they do matches “geothermal system installers”. 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 installers), 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 installers, and records with no verified work email. Companies headquartered outside Belgium 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, 420 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 installers, 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 installers are there based in Belgium?

RevenueBase identified 191 geothermal system installers headquartered in Belgium 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?

Belcotec, headquartered in Geel, tops this list with the largest team on record.

Which city has the most geothermal system installers?

Arendonk leads with 6 headquartered companies, followed by Antwerpen (4) and Bilzen (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 420 verified decision-maker contacts tracked across these 191 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.