本标准规定了能量输入不超过500 MJ/h的燃气热水器和集中供暖锅炉的具体要求和试验方法，包括用于在最高温度为99°C的条件下供应热水的类型，用于:（a）卫生、饮用和饮用目的；（b） 循环式空间供暖；以及（c）第（a）项和第（b）项的组合。

This Standard provides specific requirements and test methods for gas water heaters and central heating boilers, with an energy input not exceeding 500 MJ/h, and includes types intended for the supply of hot water at a maximum temperature of 99 °C for - (a) sanitary, potable and drinking purposes; (b) hydronic space heating; and (c) a combination of Item (a) and Item (b).