本欧洲标准描述了一种计算家用热水系统（DHW）尺寸所需功率和存储量的方法。适用范围从直接热水器（无存储量和相对较大的有效加热功率）到具有相对较小的加热功率和大存储量的较大存储系统。 本欧洲标准适用于以下储水系统: - 具有最小混合区的储存系统（如分层充电储罐或带有外部热交换器的储罐）:这些系统在本标准中被提名为“充电存储系统”; - 具有明显混合区的储罐热水器和温水储罐（如具有内部热交换器的DHW储罐），在本标准中被称为“混合储存系统”; 并为不同的用途。 范围还包括确定家用热水能源需求的标准化方法。这个欧洲标准涵盖了建筑物的家庭热水需求。 计算DHW系统的能源需求适用于住宅和非住宅建筑物，建筑物或建筑物区域。 图1显示了该标准在EPB标准集中的相对位置

This European Standard describes a method to calculate the power and the storage volume required for the dimensioning of domestic hot water systems (DHW). The applicability ranges from direct water heaters (no storage volume and a comparatively large effective heating power) to larger storage systems with a comparatively small heating power and large storage volumes. This European Standard is applicable to the following water storage systems: - storage systems characterized by a minimal mixing zone, (such as stratified charging storage tanks or storage tanks with external heat exchangers): these systems are nominated in this standard as "charging storage systems"; - storage tank water heaters and warm water storage tanks with a pronounced mixing zone (such as DHW storage tanks with internal heat exchangers), nominated in this standard as "mixed storage systems"; and for different uses. The Scope also includes standardization methods for determining the energy need for domestic hot water. This European Standard covers the domestic hot water needs in buildings. The calculation of the energy needs for DHW-Systems applies to residential and non-residential buildings, a building or a zone of a building. Figure 1 shows the relative position of this standard within the set of EPB standards in the context of the modular structure as set out in EN ISO 52000-1. NOTE 1 In CEN ISO/TR 52000-2 the same table can be found, with, for each module, the numbers of the relevant EPB standards and accompanying technical reports that are published or in preparation. NOTE 2 The modules represent EPB standards, although one EPB standard may cover more than one module and one module may be covered by more than one EPB standard, for instance a simplified and a detailed method respectively. See also Clause 2 and Tables A.1 and B.1. Table 1 shows the relative position of this standard within the EPB package of standards. (.)