The Zehnder group's European radiator production plants specialize in manufacturing specific models and are organized as a production association. This keeps production costs down (economies of scale). The production of the US and China facilities is mainly sold in the respective countries (exception: Tianjin Zehnder Thermal Co. Ltd.). The production facility in the Netherlands manufactures systems and components for the controlled ventilation and ventilation business area. Overview of production plants by country: |
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| Country | Company | Location |
| England | Greenwood Air Management Ltd | Lenham |
| France | Zehnder Group Châlons-en-Champagne S.A.S. | Châlons-en-Champagne |
| Zehnder Group Vaux Andigny S.A.S. | Vaux Andigny | |
| Germany | Paul Wärmerückgewinnung GmbH | Mülsen |
| Zehnder GmbH | Lahr und Riegel | |
| Netherlands | J. E. Stork Ventilatoren BV | Zwolle |
| P.R. of China | Beijing Zehnder Radiators Co. Ltd. | Beijing |
| Tianjin Zehnder Thermal Co. Ltd. | Tianjin | |
| Poland | Zehnder Group Boleslawiec Sp. z o. o. | Boleslawiec |
| Sweden | Freshman AB | Täby |
| Switzerland | Zehnder Electronic AG | Gränichen |
| Zehnder Group Produktion Gränichen AG | Gränichen | |
| Turkey | Sanpan | Manisa |
| USA | Hydro-Air Components Inc. | Hamburg NY |
| Runtal North America, Inc. | Ward Hill, MA | |