Plumbing, heat and air-conditioning installation: highest published revenue
349 Belgian companies in the sector (NACE 4322) publish their revenue in recent accounts; here are the top 20. Imtech Belgium OU en Francais Imtech Belgique OU en Neerlandais Imtech Belgie leads with €192.3m (financial year 2025).
Top 20
Ranked by revenue published in the latest filed accounts (accounts less than 3 years old).
| # | Company | Total assets | Revenue | Equity | FTE | Year |
|---|---|---|---|---|---|---|
| 1 | Imtech Belgium OU en Francais Imtech Belgique OU en Neerlandais Imtech Belgie 1070 Anderlecht | €99.2m | €192.3m | €37.5m | 568.2 | 2025 |
| 2 | Bumaco Koeltechniek 3110 Rotselaar | €31.8m | €95.4m | €18.5m | 269.3 | 2025 |
| 3 | VMA Sud 6040 Charleroi | €54.9m | €90.3m | €11.1m | 330.4 | 2025 |
| 4 | SIX 8870 Izegem | €31.8m | €65.0m | €13.5m | 198.4 | 2025 |
| 5 | Altebra 9500 Geraardsbergen | €165.2m | €60.6m | €34.2m | 101.3 | 2025 |
| 6 | Boons Theo 2370 Arendonk | €26.5m | €54.9m | €8.06m | 92.6 | 2025 |
| 7 | Aquasecurity 9320 Aalst | €22.8m | €43.0m | €13.6m | 133.8 | 2025 |
| 8 | MR-Group 8550 Zwevegem | €21.1m | €42.2m | €8.39m | 40.8 | 2025 |
| 9 | Clima & Partners 2110 Wijnegem | €16.6m | €32.0m | €3.55m | 101.5 | 2025 |
| 10 | Jansen Cleanrooms & Labs 3670 Oudsbergen | €14.1m | €30.5m | €3.67m | 59.4 | 2024 |
| 11 | Quartier 8520 Kuurne | €12.7m | €29.7m | €2.72m | 18.0 | 2025 |
| 12 | Beltherm 8210 Zedelgem | €13.1m | €29.6m | €5.74m | 116.7 | 2025 |
| 13 | TROX Belgium 1070 Anderlecht | €9.37m | €27.9m | €1.39m | 44.5 | 2024 |
| 14 | Van Severen 9910 Aalter | €7.91m | €27.8m | €4.40m | 52.9 | 2025 |
| 15 | ISB Building Technics 1210 Saint-Josse-ten-Noode | €13.2m | €25.3m | €2.73m | 87.8 | 2025 |
| 16 | Gezel 9255 Buggenhout | €10.3m | €23.9m | €5.59m | 76.3 | 2025 |
| 17 | Delta Thermic 4040 Herstal | €13.4m | €23.8m | €2.88m | 94.7 | 2025 |
| 18 | Lambert, DRY Cleaning and Laundry Equipment 8700 Tielt | €15.4m | €22.9m | €7.63m | 53.8 | 2025 |
| 19 | Systemair 3200 Aarschot | €8.70m | €22.8m | €4.52m | 28.2 | 2025 |
| 20 | Weishaupt 1070 Anderlecht | €13.3m | €22.3m | €7.63m | 76.0 | 2025 |
These are the revenue figures published in the annual accounts. Small companies (micro and abridged accounts) do not have to publish theirs: they do not appear in this ranking.
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Frequently asked questions
Which company in Plumbing, heat and air-conditioning installation has the highest revenue?
Imtech Belgium OU en Francais Imtech Belgique OU en Neerlandais Imtech Belgie, with €192.3m in revenue (financial year 2025).
How many Plumbing, heat and air-conditioning installation companies publish their revenue?
349 out of 8,151, in accounts less than 3 years old. Small companies (micro and abridged accounts) are not required to publish it.
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Open the full file →Active companies (legal entities) that have filed at least one set of annual accounts, based on the Crossroads Bank for Enterprises and the National Bank of Belgium. The sector is the main activity in the register; the municipality is that of the registered office. Data updated on 14 Nov 2026.