1. Alfa Laval AB
2. Babcock & Wilcox Enterprises Inc
3. Bharat Heavy Electricals Limited
4. Bosch Industriekessel GmbH
5. Byworth Boilers
6. Cleaver-Brooks Inc.
7. Devotion Machineries Co. Limited
8. Doosan Heavy Industries & Construction
9. Fulton Ltd
10. General Electric Company
11. Hurst Boiler & Welding Company Inc.
12. Mitsubishi Power
Ltd.
13. Parker Boiler Co.
14. Siemens AG
15. Sumitomo Heavy Industries
Ltd.
16. Thermodyne Engineering System
17. Viessmann Group