Kiwa uses two documents to obtain the GASTEC QA product certificate. The GASTEC QA general requirements, which lay down the procedure for obtaining the certificate, maintaining the certificate and the requirements for the certification body (Kiwa). In addition, Kiwa uses the GASTEC QA approval requirement, which sets out the requirements for the product. Both documents together form the GASTEC QA certification scheme.
You will find the GASTEC QA general requirements here. You will find the GASTEC QA approval requirements via QA approval requirements.