Plumbers' technical note – Water heater installations

Information status

All documents issued prior to 1 July 2017 were issued by the former Department of Commerce. Documents listed here are the latest versions available. For more information on this document, please contact

This publication is for: 

This technical note has been issued to inform the plumbing industry about the correct termination of drain lines from temperature/pressure-relief valves and expansion control valves associated with new installations as well as alterations, additions and repairs to existing installations of all types of water heaters.

Building Commission
Technical standards
Last updated 22 May 2014

Share this page:

Last modified: