i hv just finished DIY installed my water heater and rain shower replacing my faulty water heater in one of my another toilet.
Faulty water heater (from my experience regret buying this brand):

hi bro,

i have used alpha before..last for 10 years already kaput..(i do not know how the quality of alpha water heater now) but now change to new panasonic as i mention in my previous post..panasonic is good.

I have also used 2 joven i70 dc inverter for 6 years already and still working good..in term of silence..Joven i-series is the best..

for Hitachi dc inverter i bought at AEON offer RM499 cheaper than joven so i give it a try..in term of pressure is same as joven and panasonic but in term of silence..Joven i-series is the winner.