AS/NZS 3500.4:2025
Plumbing and drainage, Part 4: Heated water services
Standards New Zealand
Pick a clause from the contents on the left to see community comments and worked examples, or jump into a section below.
Sections
- 1Scope and general
- 2Materials and products
- 3Cross-connection and backflow prevention and thermostatic mixing valves
- 4Installation of cold and heated water piping and controls
- 5Installation of water heaters — General requirements
- 6Installation of solar water heaters
- 7Uncontrolled heat sources
- 8Energy efficiency
- 9Testing and commissioning
- 10Sizing and installation of circulatory heated water reticulation
- A(informative) Water analysis
- B(informative) Demonstrating products and materials are fit for purpose
- C(normative) Internal pipe diameters
- D(informative) Preferred pipe sizes for non-circulatory typical single-storey household installations
- E(informative) Recommendations for the installation of unrated solar heated water supply systems
- F(informative) Recommendations for the installation of close-coupled and integral solar heated water supply systems on roofs
- G(informative) Solar heated water supply systems — Suggested component sizes (custom-built systems)
- H(informative) Estimation of shading of collectors
- I(informative) Effect of inclination and orientation on system performance
- J(informative) Map of regional basic design wind speeds
- K(normative) Australian climate regions
- L(normative) New Zealand climate regions
- M(informative) Operation and maintenance
- N(normative) Provision for expansion and contraction
- O(informative) Estimation of probable simultaneous demand for residential buildings from the total of loading units
- P(normative) Sizing of expansion vessels in mains pressure systems
- Q(informative) Sizing of branches from circulatory heated water systems