If all pipes are pvc then the geyser needs to be bonded as per 6.16.2 - Then that is where the grey area of Twin & earth not having a full 2,5sqmm earth will come in.
6.13.2.2 Hot and cold water systems
Where the hot water system includes electric components and the water pipes
are of conducting material, hot and cold water systems shall be bonded
together and also be bonded to the earth continuity conductor system
6.16.2 Water heaters
NOTE Water heaters include geysers, instantaneous water heaters including units for
boiling water, heat pumps, solar systems, induction water heaters and the like (see also
6.16.1). electrode water heaters, steam generators and boilers are not included (refer
to 6.16.7)
6.16.2.1 All water heaters shall be bonded in accordance with 6.13 and a.c.
supply circuits shall be protected by earth leakage protection with IΔn not
exceeding 30 mA.
NOTE To mitigate nuisance earth leakage tripping, an additional earth leakage may
be provided.
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