scope:

This New Zealand Standard 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 a head). It is restricted to systems with open vents. This Standard also applies 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 in this Standard.

This Standard is divided into the following Parts:

Part 1 - General

Part 2 - Installation of water heaters

Part 3 - Installation of hot water reticulation systems

Part 4 - Installation of dual systems with natural circulation

Part 5 - Installation of dual systems with pumped circulation