multi point water heater safety
Im looking at getting electric multipoint water heaters for each bathroom. I had originally intended sloar but this maybe for another day. The main thing for me is safety and there are a couple of things i would like some clarity on.
I was thinking of buying a fagor(Siemens) multipoint, the main reason being it has NO elcb, instead an rcbo will be used which is i believe rcd protection. The main reason for this is that elcb is not as effective and relies on a fuse, but it less likely to pick up more nuissense trips. Id rather be nuissenced than dead, and then fix the problem, but can anyone point out anf faults with my understanding?
secondly i have copper pipes for hot water this is only served from the water heater as the incoming is blue plastic, do i have to earth bond this pipe it is exposed to taps as they also have copper tails?
i have read various papers saying that it is both good and bad to earth back to consumer unit my thinking is its not a good idea as this negates the point of local earthing for protection of shocks.
The metal that will be in the bathroom will be an exposed chrome shower which is connected to copper pipes, chrome taps all of which are copper but plastic coming into heater and lights. there will be no sockets or switches inside.
Thanks for your help and guidance.