Valves and safety devices must be in accordance with clause G12 of the New Zealand Building Code.
Tempering valves must comply with NZS 4617 or AS 1357.2. All components, once installed, must be
accessible for inspection, maintenance and removal. Safe trays must be installed under the water
heater where water could penetrate another household unit within the same building. Drain pipes must
have a conveniently located isolation valve and terminate with a cap or plug, or, if terminating outside
the building, with a cap only.
Important note:
Temperature and Pressure Relief (TPR) valves are designed to relieve excess pressure to ensure non-
vented water heaters do not explode. TPR valves are designed to keep the maximum water
temperature below 99°C. Drain lines from the TPR valve must be copper and discharge to an
appropriate place that does not cause damage to the building. If draining into a tundish, the tundish
must be constructed of a material capable of withstanding 99°C water.
4.4 Anchorage and seismic restraint
Sigma Sheetmetal Products Limited. Subject to technical modifications Page 8
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