本欧洲标准规定了一种家用热水系统的能源评估方法，包括一个特定的最小输出的外部加热锅炉，间接加热高达1 500 l的未通风（封闭）热水箱。虽然主要用于直接加热的坦克不在本欧洲标准范围内，但它允许提供用于辅助使用的电加热元件

This European Standard specifies a method for the energy assessment of a domestic hot water system comprising an external heating boiler of specified minimum output indirectly heating an unvented (closed) hot water tank of up to 1 500 l. Whilst tanks intended primarily for direct heating are not covered by this European Standard, it does allow the provision of electric heating elements for auxiliary use.