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AS/NZS 3500.4:2025 specifies 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 the valves 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

Provides guidance to inspecting persons (e.g. building certifiers and competent persons) and builders about how to meet their inspection responsibilities under the Building Act 1975 (BA) and the Building Regulation 2021 (BR).

This Guide is intended to supplement to the "Criteria for the Passive House, EnerPHit and PHI Low Energy Building Standards" ("Criteria") published by the Passive House Institute and posted online; it explains the Criteria's requirements given here in a brief and precise manner.