| Odörfer Haustechnik GmbH | Austria |
| MVA Garant Group | Belarus |
| Eccoplan | Croatia |
| MTV Water Services Ltd | Cyprus |
| Climatec Group A.S. | Czech Republic |
| Klimadan A/S | Denmark |
| Movek Grupp Oü | Estonia |
| Thermia Partners AB | Finland |
| IWS GmbH Centralbüro Deutschland | Germany |
| Multitherm GmbH Bentwisch | Germany |
| Multitherm GmbH Burglengenfeld | Germany |
| Zafiris Fountoukis | Greece |
| Soltec LLC | Hungary |
| Friorka enf. | Iceland |
| Verklangnir ehf. | Iceland |
| Heatlink Ireland | Ireland |
| Geoliving srl | Italy |
| SIA Harmonija Un energija | Latvia |
| NAUJOS IDËJOS | Lithuania |
| Thermia | Norway |
| Begom sp. z o.o. | Poland |
| ENAT - Energias Naturais, Lda | Portugal |
| Secpral Pro Instalatii | Romania |
| Technological concern EST Kaliningrad | Russia |
| Thermotech Russia | Russia |
| Atlas Trading d.o.o. | Slovenia |
| Girod Geotermia | Spain |
| Thermia Värme AB | Sweden |
| Norsel | Switzerland |
| Akcor A.S. | Turkey |
| Noviterm Ltd | Ukraine |