That is a 13 Ampere RCD Spur.  Is it suitable for a 15 Ampere water heater?  Thanks in advance.

If you don't turn-up the heater to maximum, it should be alright.  13A can handle 2.9 kW.

Thanks Ozak for the info. On this 13A RCD fused spur matter, you may not turn to to max when bathing but what about others. You cant tell if they will turn to max or 3/4 way to max when bathing. Will the fused blow if turn to max or just kaboom?

Hello..

Can i do like this setup?

1. Buy water heater without rain shower head.
2. Buy rain shower head with arm.
3. Conceal the pipe(PVC)

Thanks.

Even with 0.75hp booster pump not enough? If cannot, then i have no choice lor.
How about PVC piping? My contractor said PVC can use for water heater. I doubt about that.