Panasonic
with push start model
without LCD nonsense

Make sure WH circuit at DB box has 10mA RCD fitted.

I would never trust joven

Look inside the DB box
See the bigger blocks with test button?
[attachmentid=11488472]
For every water heater:
You need to have one big block with test button that:
a) cuts off ONLY the water heater when Test is pressed (NOT the whole house) AND
b) is rated at 10mA (0.01A).
[attachmentid=11488473]

[attachmentid=11488474]

And why do you need this protection?
a) It's the law - https://www.st.gov.my/en/contents/publicati...r%20Systems.pdf
b) Funerals are expensive
[attachmentid=11488475]