Plumbers' Technical Note – Flow and return lines from solar water heaters

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

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This technical note has been issued to advise the plumbing industry of the mandatory requirements and best practice when installing flow and return lines from solar water heaters/panels on the roof to auxiliary water heaters or storage tanks at ground level.

Building Commission
Technical standards
Last updated 24 Oct 2016

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