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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

To assist the industry preparing for changes coming in on 1 May 2023, reduce the risk of non-compliant installation of waterproofing systems, and provide an understanding of the key changes for waterproofing for NCC 2022.

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.