1. Bosch Thermotechnik Gmbh
2. Johnson Controls International Plc
3. Glen Dimplex Deutschland GmbH
4. Solarbayer GmbH
5. Viessmann Climate Solutions SE
6. Daikin Manufacturing Germany GmbH
7. STIEBEL ELTRON GmbH & Co. KG
8. Toshiba Europe Limited
9. Mitsubishi Electric Corporation (ECODAN)
10. Carrier Corporation