even if heater element leaks electricity, the water can't conduct electricity as it breaks up into drops as it comes out of the showerhead and won't create a circuit

and if all external parts are plastic/non-conductive then should be ok

Haha... like that also can.    I got no comment already.

Your curiosity is haunting you. 

The water is the electrical transfer medium. The electrucute doesn't neccassary coming from the shower that you use. It can come from anybody that using the water.

All storage heater piping will be earth. Make sure house earth cable are working. I earth all my ss piping.

Even solar can be dangerous if electric leak. Imagine a live wires touches the steel / copper pipe. These can happen when rats bit the cables and it touches the pipes.

Storage tank have earth wires.

The key is to have your house earth wire working. Without Earth is without protection.

There is a dangerous your elcb won't trip if you earth your piping. Piping is consider a conductor to earth. Cause piping is run to ground too.

If the current travel to pipe instead to elcb, your elcb won't detect current fault.

May i know how to check earth wire working?

Press ELCB button. If it trips, it's working.

How about storage tank?

Haha... like that also can.    I got no comment already.

I seen all instant water heater has change to gray rubber piping instead of aluminium.

Storage tank have earth wires.

The key is to have your house earth wire working. Without Earth is without protection.

Panasonic is more reliable. Why choose joven? Branded?

dont use hot water heater lar.. we are in malaysia lar so cold meh our weather? bath cold water gooding.. can increase body metabolism .. burn fat... budak budak nowadays so pampered, in my grandpapa time bath early morning from teligi siok woh.. or so they tell me..

No need to pampered, no astro, no internet, no smart phone, no need electicity.. Last time without all these also can survived...

All there are Standard of living..don't have won't die ma... So go without it lo

dont use hot water heater lar.. we are in malaysia lar so cold meh our weather? bath cold water gooding.. can increase body metabolism .. burn fat... budak budak nowadays so pampered, in my grandpapa time bath early morning from teligi siok woh.. or so they tell me..

cold bath bad for liver. mampus cepat

You guys are far from topic. Go back to your post.

Anyway, I understand abit why the couple get electrucute and the elcb don't trip. Don't think got earth wire problem with their heater.