Quality marks Installers who are members of the Zoncoalitie Association are affiliated with solar power quality labels VCA / EBN and InstallQ (Merger of Sterkin and KvINL). Zonnkeur is also a quality mark that many members meet. In addition, most are members of sector organizations such as Holland Solar and Techniek Nederland. These quality marks with accompanying quality standards and minimum warranty periods on the solar systems supplied offer customers insight into the quality of the solar systems supplied and the underlying electrotechnical design in accordance with Dutch industry standards for electrotechnical systems such as NEN1010, so that they also meet the quality requirements of insurers and financiers. verified_user-50px VCA/EBN VCA / EBN is a Dutch industry standard for project managers and installers of installation companies with a focus on the safety, health and environmental activities of the installation work. This compliance is tested by the EBN research bureau by means of regulations and a periodic compliance check. verified_user-50px InstallQ InstallQ is a merger of KvINL ("Quality for Installations Netherlands") and Sterkin. This Dutch quality mark for installers monitors the quality of the technical (solar) installations supplied. As part of this quality mark, installers guarantee, among other things, that their installations and designs meet all the requirements of the Building Decree. verified_user-50px Zonnekeur Zonnekeur installers have demonstrably a lot of experience and have passed the national solar energy installer exam and have passed the practical test. The Zonnouding solar water heater meets all quality standards. Choosing the Solar Approval is therefore choosing certainty for a long, reliable and safe use of solar energy.