Draft Document - Central heating boilers - Main specification for indirectly heated unvented (closed) metallic pressurized buffer tanks - Requirements, testing and marking; German and English version prEN 17692:2021
文件草案.集中供暖锅炉.间接加热的未排气(封闭)金属加压缓冲罐的主要规范.要求 试验和标记;德文和英文版本prEN 17692:2021