Applies to installation in domestic and light commercial establishments of thermal storage water heaters complying with NZS 4602 and NZS 4606 fitted with a pressure relief valve instead of an open vent. (For open vented systems see NZS 4603.) Referenced in BIA Approved Document G12.
Date published: 28/02/1990
Download the New Zealand standard NZS 4607:1989 [PDF, 1.4 MB]
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