Been using Panasonic, Joven and Alpha water heaters.
For Panasonic, the push start button can't last 3 years.
So I changed to Joven, used it for 7 years without any problem.
Retired the problem free Joven after 7 years due to my personal safety standard and changed to Alpha 18e (no pump) because of the new safety feature with smart auto self-test on the internal curcuit to check if there is any leakage on all electric components & parts and line fault indicator. But one very important parameter that I overlooked on the Alpha is the minimum water pressure of 20kPa. If more than 2 water taps running at the same time, heater cut off too easily due to not enough water pressure. My previous Joven heater only requires 10kPa min pressure and it hardly gave me sudden cold water during shower.
However, just slightly over 2 years of usage, one of my Alpha 18e self detected an internal fault and rendered the heater totally useless. So I replaced it with a new Joven SA10E. This model has EELS safety feature such as built in 10mA automatic electrical leakage detector and surge protector. Of course, I make sure that this new Joven SA10E can also take minimum 10kPa of water pressure.

Bro,

The Joven SA10E has a built in 10mA automatic electrical leakage detector. What is the different between this 10mA detector and the external 10mA RCCB as per recommendation by Suruhanjaya Tenaga below:

I posted the above review in July 2016 and now my 2nd Alpha Smart 18E die today. I guess smart water heater with smart chip doesn't last.