就家用热水系统的热损失提出最低能效要求。它适用于所有家用热水系统，不考虑能源来源，包括住宅、工业和商业建筑中可能存在的系统，但不包括专门用于空间加热、冷却或工艺的系统。这些要求基于对绝缘成本和节能的实际和经济分析。

Sets out minimum energy efficiency requirements in terms of heat losses from domestic type hot water systems. It applies to all domestic type hot water systems irrespective of the energy source, and covers systems that may be found in residential, industrial and commercial buildings, but excludes systems used exclusively for space heating, cooling or for processes. The requirements are based on a practical and economic analysis of insulation costs and energy savings.