适用于符合NZS 4602的蓄热式电热水器垂直位置的安装，设计用于在不超过120 kPa（12.0 m水头）的压力下工作。它仅限于具有开放式通风口的系统。也适用于热水网络系统、双系统、湿背式热水器或类似的热水器的使用，这些热水器向汽缸供应热水，补充来自电气元件的热量。不包括太阳能辅助系统。

Applies to the installation in the vertical position of thermal storage electric water heaters complying with NZS 4602 and designed to work on pressures not exceeding 120 kPa (12.0 m head). It is restricted to systems with open vents. Applies also to hot water reticulation systems, to dual systems, and to the use of wetbacks or similar water heaters which supply hot water to the cylinder, supplementing the heat derived from the electric element. Solar assisted systems are not covered.