- TURBODEN S.p.A., Italy
- BES – BOLLMANN GmbH, Germany
- ESOTECH d.o.o., Slovenia
- DAWCUL Ltd, Great Britain
- SPE TECH AG, Switzerland
- ENGIE AXIMA, Belgium
- S.C.A.N. d.o.o., Croatia
- IFA TECHNOLOGY GmbH, Germany
- SIEMENS AG, Austria
- EVATHERM AG, Switzerland
- EQTEC IBERIA, Spain
- HPS Sourcing&Trading GmbH, Austria
- KARA ENERGY B.V., Netherlands
- SMED ENGINEERING AS, Norway
- REEL ALESA AG, Switzerland
- INA – Industrija nafte d.d., Croatia
- PLIVA d.d., Croatia
- HEP – Toplinarstvo d.o.o., Croatia
- HEP – Proizvodnja, Croatia
- HEP – Proizvodnja d.o.o., Croatia
- KONČAR – Metalne konstrukcije d.d., Croatia
- VODOTEHNIKA d.d., Croatia
- STSI d.o.o., Croatia
- PETROKEMIJA d.d., Croatia
- PETROKOV d.o.o., Croatia
- DK – Dampf-Kondensatsysteme, Germany
- GDA SVERIGE AB, Sweden
- TECHNOBELL Ltd, Great Britain
- ZIEGLER d.o.o., Croatia
- PIRO LMS d.o.o., Bosnia and Herzegovina
- LUK d.o.o, Bosnia and Herzegovina
- TERMOTEHNIKA d.d., Bosnia and Herzegovina
- INTERCLIMA d.o.o., Bosnia and Herzegovina
- VIPOLL d.o.o., Slovenia
- TOPOL ARMATURE d.o.o., Slovenia
- PROTIM d.o.o., Macedonia
- MICON SR AB, Sweden
- MOL, Hungary
- PANNONIA ETHANOL Zrt., Hungary