For what type of water heater? Solar or normal instant water heater?

No difference. Some DC motor quiet but some noisier than AC

Pro:
Can supply to several bathroom
With high water pressure (high water flow rate), the water is still warm enough.
Faulty heater element hard to replace (on ceiling). Water wet ceiling during replacement because not all water in storage can be dried up (my own experience )

Con:
More electricity if it is kept on, otherwise, the heat loss is just waste of energy during off state.
You tend to fully blast the water at high flow compares to instant water heater, thus water waste.
Normally use copper piping for hot water. How to channel to several bathrooms without major hacking?

I have both storage and instant. Storage in master bedroom because the house came with copper piping in the wall already. The heater element will corrode over time and cause power trip in the heater line. Many shops or service people told me that usually people will replace will new tank. Well, I'll stick to replacing the heater. Bought it for RM90 (if not mistaken). Was unable to replace it because location too tight to put my spanner. Just called a person that familiar and he devised his own tool to make his work easy

I only switch on when I want to use just like instant water heater. It does not take much time, probably less than 30s to start feeling the warm water. Keeping the heater on assuming like hot water pot increases electricity bill probably RM20~30. The heat retention is just not good I think.

I would say any known brand is okay. Well, there is only 2 brands that has many models I think. It is Joven and Alpha. If youj google you can find and compare those. If you do not want to put on ceiling, you can go for vertical one and put high in bathroom wall (if you have big bathroom and don't mind looking at it ).

I saw around RM730 ... eg.

https://www.banhuat.com/alp50l-h
https://shopee.com.my/Joven-50L-Vertical-St...96121.216851179

JUst make sure the size can go through the ceiling opening you have, otherwise have to remove ceiling

The shop selling these or any plumbing stuff shop can always provide you with installer. I do not have contact already. Long time. Sorry.

You see the reply in y4ng"?

Ecoheater came once cos the board was burnt. According to them, they said I switched on without water in it.

No water also cannot detect and switch off itself. Where is the safety? Damn stupid reply. I think that was not the reason for failure.

BTW, I use Joven JH35.

It was installed on ceiling. I think the price was around RM450 around 10 years ago. I think you can get around RM500+

After 10 year + the power tripped. It was because the heater element has corroded and caused short circuit. They said people just replace with new one. The tank was still good. Why need to replace? I bought the replacement heater and get it replaced. If not mistaken RM120. It was several years ago. Now it is running fine.

The tank was installed on ceiling by the way.