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3rd edition, amendment 9


Effective on 14 February 2014 until 30 May 2017

All of the Acceptable Solutions and Verification Methods relating to G12 are contained in one document.

  • G12/VM1 provides a Verification Method for the design of water supply systems.
  • G12/AS1 applies to below and above ground piped water supply systems. It details cross connection hazards, backflow prevention, air gap separation, water tanks, flow rates and equipotential/earth bonding.  It includes hot water supply systems, climates subject to freezing and seismic restraint.
  • G12/AS2 applies to solar water heaters installed in or on buildings. 
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This information is published by the Ministry of Business, Innovation and Employment’s Chief Executive. It is a general guide only and, if used, does not relieve any person of the obligation to consider any matter to which the information relates according to the circumstances of the particular case. Expert advice may be required in specific circumstances. Where this information relates to assisting people: