EN ISO 9001:2000
Grizelj d.d. is the first privately owned company in Bosnia and Herzegovina that is EN ISO 9001 certified, and owns this certificate from 1998. Certificate EN ISO 9001:2000 (System of quality control) was issued by TUEV CERT, a leading certification authority, and recertified in 2005.

EN ISO 14001
Grizelj d.d. is the first privately owned company in Bosnia and Herzegovina to have the EN ISO 14001 certificate for emissions control and environment protection issued by TUEF CERT. It was issued in 2000, and recertified in 2004.

CE sign
Grizelj d.d. is the first company in Bosnia and Herzegovina with the right to use the CE sign and together with our daughter companies ITG d.o.o. Sarajevo and ITG Waermetechnik GmbH Wien, we have 90 certified products today.
DVGW - Certification Body - registered by the Government of the Federal Republic of Germany and officially registered by the European Commission for conformity assessment of gas appliances.