AS NZS 3500.4:2021 Plumbing and drainage Part 4: Heated water services.
This document sets out the requirements for the design, installation and commissioning of heated water services using drinking water or rainwater or a combination thereof. It includes aspects of the installation from, and including, the valve(s) on the cold water inlet to any cold water storage tank or water heater and the downstream fixtures and fittings. It applies to new installations as well as alterations, additions and repairs to existing installations.
This document applies to the installation of the following types of water heaters:
Storage water heaters with a rated delivery or capacity of up to 700 L per heater.
Heat exchange water heaters.
NOTE 1 Electric heat exchange water heaters are defined in AS 1361. Other fuel sources are covered in the applicable Standards, e.g. AS/NZS 2712, AS/NZS 5263.1.2.
Instantaneous, continuous flow water heaters.
NOTE 2 Appendix M provides guidelines for the operation and maintenance of heated water services.
Illustrations used in this Standard are diagrammatic only and have been chosen without prejudice.
1.2 Application
1.2.1 Australia
This document shall be read in conjunction with the relevant mandatory requirements for heated water services under the National Construction Code (N CC), primarily Volume Three, Plumbing Code of Australia (PCA).
Where alternative Australian or New Zealand Standards are referenced (e.g. AS 1345), the Australian Standard shall be used for Australia only.
1.2.2 New Zealand
This document shall be read in conjunction with the New Zealand Building Code. This document may be used to demonstrate compliance with the New Zealand Building Code, Clause G12 Water Supplies.
Where alternative New Zealand Standards are referenced (e.g. NZS 5807), the New Zealand Standard shall be used for New Zealand only.
1.3 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document.
NOTE Documents referenced for informative purposes are listed in the Bibliography.
AS 1432, Copper tubes for plumbing, gasfitting and drainage applications
AS 3498, Authorization requirements Jor plumbing products—Water heaters and hot-water storage tanks.AS NZS 3500.4 pdf download.