DIN 18380-2016 德国建筑包工合同程序 (VOB). 第C部分:建筑包工合同 (ATV) 的通用技术规范. 中央供热系统和热水供应系统装置
German construction contract procedures (VOB) - Part C: General technical specifications in construction contracts (ATV) - Installation of central heating systems and hot water supply systems