European foreword This document (EN 1434-6:2015/prA1:2017) has been prepared by Technical Committee CEN/TC 176 ??Thermal energy meters??@ the secretariat of which is held by SIS. This document is currently submitted to the CEN Enquiry. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association@ and supports essential requirements of EU Directive. For relationship with EU Directive@ see informative Annex ZA@ which is an integral part of this document.