I notice a lot of people uses 1.5 and 2.5 surfix on geysers I know the answer to this, based on the amps and distance I can do this.. Also the cost of the cable is less My question is just if bonding and earthing requires at least 2.5 earth conductor is the geyser then leggily earthed and bonded or do I miss something somewhere?
I prefer, at least, a 4mm conductor for geysers and aircons. Depending on the stove's requirements I use 4mm or 6mm

Greetings and enjoy your weekend