1.   RWE Energie AG, Essen; Dortmund; Frimmersdorf

2.   Siemens AG; PG; Vienna / Erlangen

3.   Eon AG; Gelsenkirchen

4.   Doosan Lentjes GmbH, Ratingen;

5.   John Zink, Krefeld;

6.   Standardkessel-Gesellschaft GmbH & Co KG, Duisburg

7.   BASF, Ludwigshafen

8.    Linde AG, Höllriegelskreuth (near Munich)

9.    TÜV Süddeutschland, Munich; Stuttgart; Dresden

10. Babcock Borsig Steinmüller GmbH, Oberhausen

11. Wulff und UMAG, Husum

12. Borsig Boiler Systems, Berlin

13. Martin GmbH; Munich

14. Caloric GmbH; Gräfelfing

15. Wallstein GmbH; Recklinghausen

16. VKK Standardkessel; Köthen

17. Eisenwerke Baumgarte GmbH; Bielefeld

18. Babcock Omnical; Dietzhölztal;

19. Würz GmbH; Willich-Münchheide

20. GEA Ecoflex GmbH; Duisburg

21. HKS Engineering GmbH; Kaarst;

22. ThyssenKrupp Uhde GmbH; Dortmund

23. IFE Systems GmbH; Leipzig

24. Oschatz GmbH; Essen

25. Outotec GmbH; Oberursel

26. SMS Demag AG; Düsseldorf

27. Tenova GmbH; Düsseldorf

28. Mitsubishi Hitachi Power Europe GmbH; Duisburg

29. Kablitz GmbH; Lauda

30. Balcke-Dürr GmbH (SPX), Ratingen

31. Weiss GmbH; Dillenburg

32. Air Liquide Lurgi GmbH; Frankfurt

33. ENVIROTHERM GmbH; Essen

34. Rosink GmbH; Nordhorn

35. Schneiderkessel; Berlin

36. Viessmann AG ; Allendorf; Berlin

37. Mannesmann Engineering & Construction; Düsseldorf

38. Hülsenbusch, Kempen

39. Andritz Maerz GmbH; Düsseldorf

40. Hitachi Zosen Inova Deutschland

41. Alstom Power AG, Baden, Switzerland

42. Shell; Amsterdam; Netherlands

43. EDF, Paris; France

44. Rafako, Ratibor, Poland

45. Duro Dacovic; Slavonski Brod, Croatia

46. CNIM; La Seyne Sur Mer; France

47. Andritz Energy and Environment, Graz & Wien, Austria

48. Vyncke, Harelbeke, Belgium

49. Babcock & Wilcox Volund; Denmark

50. Keppel Sehgers, Willebroeck, Belgium

51. Lointek Ingeniería y Técnica, Urduliz; Spain

52. Hocon Ketelbouw B.V., Venlo, Netherlands

53. Josef Bertsch Ges. m. b. H. Bludenz; Austria

54. Austrian Energy & Environment CZ s.r.o.; Brno; Czech Republic

55. Gestamp Biomass Solution S.L; Cadiz; Spain

56. Boiler Works (DP Cleantech) AS ; Tønder; Denmark

57. Danstoker AS; Herning; Denmark

58. Rantotek; Varkaus; Finland

59. Hafner GmbH; Bozen, Italia

60. Polytechnik GmbH; Weissenbach; Austria

61. SCHMID AG-Holzfeuerungen; Eschlikon; Switzerland

62. NEM Services (Standard Fasel) B.V. ; Utrecht ; Netherland

63. STF; Magenta; Italia

64. Weiss A/S; Hadsund; Denmark

65. ICPET GENERATOARE ABUR; Bucharest; Rumania

66. Neotherm; Varese; Italia

67. Renewa; Lathi; Finland

68. Foster Wheeler, Madrid, Spain

69. SES a. s. ; Tlmače; Slovak Republic

70. Viessman; Didenheim; France

71. CDK, Levice; Slovak Republic

72. CMI Willebroek; Belgium

73. Aalborg Boiler Engineering; Aalborg; Denmark

74. SPX; Perugia; Italia

75. Ambitermo; Cantonhede; Portugal

76. Vinci; Paris; France

77. Lenzing AG; Lenzing; Austria

78. Stork; Hengelo; Netherlands

79. Deltaway; Strasbourg; France

80. Host; Enschede; Netherlands

81. Fichtner Consulting Engineers Ltd; Stockport; UK

82. Astebo (Zauner); Wallern; Austria

83. Yara Environmental Technologies GmbH; Vienna; Austria

84. EVN Abfallverwertung; Zwentendorf; Austria

85. ZRE ELKO; Racibórz, Poland

86. Kohlbach GmbH, Wolfsberg, Austria

87. CNIM Babcock Services; Paris; France

88. Mondi; Vienna; Austria

89. Boustead International Heaters, Burgess Hill, UK

90.ENERGYia, Levice, Slovakia

91. Nooter Eriksen; St. Louis MO

92. Babcock & Wilcox, Barberton, OH

93. Intertek Sunnyvale, CA

94. Suncoke; Knoxville TN 

95. CMI; Erie; PA

96. Florida Power & Light; West Palm Beach; FL

97. Siemens Westinghouse, FL

98. Vogt Inc. Louisville; KY

99. Tetra Engineering; Weatogue; CT

100. Innova Global, Plymouth, MN

101. CleaverBrooks, Lincoln, NE

102. Thermax India, Pune

103. Bharat Heavy Electricals Ltd (BHEL) Thiruchirapalli 

104. Thermal Systems, Hyderabad

105. Thyssen Krupp India (TKI), Pune

106. ISGEC John Thompson, Noida (Delhi)

107.Furnace Fabrica, Mumbai

108. Hitz; Hitachi Zosen Innova; Hyderabad

109. JFE India, Pune, India

110.Zeeco India, Mumbai, India

111. CBC, Jundiai, Brazil

112. DKME; Seoul; Korea

113. Doosan; Busan; Korea

114. Petronas; Kertih , Malaysia

115. DanPower; Piracicaba; Brazil

116. Sermatec; Sertãozinho; Brazil

117. Firsteam Engenharia de Caldeiras; Ribeirão Preto; Brazil

118. S&T; Seoul; Korea

119. S C Engineering; Seoul; Korea

120. Sookook Cooperation; Korea 

121. SEC Sedea Enertech; Seoul; Korea

122. Caldema, Sertãozinho, Brazil

123. Dedini, Piracibaba, Brazil

124. IST, Cambridge, Canada

125. Austrian Energy & Environment Nanjing Boiler, Nanjing, China

126. Descon; Lahore; Pakistan

127. DP Clean Tech; Beijing; China

128. Getabec International Co. Ltd; Bangkok; Thailand

129. PT DINAMIKA ENERGITAMA NUSANTARA; Sidoarjo; Indonesia

130. Thermal Engergy Systems; Cape Town; South Africa

131. Hangzhou Boiler; Hangzhou; China

132. Wuxi Boiler; Wuxi; China

133. Siterm; Istanbul; Turkey

134. KNM Borsig Boiler; Kuala Lumpur; Malaysia

135. Agon Pacific Co; Bangkok; Thailand

136. Hansol; Busan; Korea

137.Bangkok Industrial Boiler BIB, Bangkok, Thailand

138. University of Applied Sciences Hamburg

139. Hamburg – Harburg

140. Vienna; Austria

141. CANMET; Ottawa; Canada