Just for sharing, currently using Beebest SP2 instant water heater.
The water is hot and powerful and yet the pump is silent (DC Pump - much longer life pump).
It has no fancy and not a great looking water heater but it purposeful and even my very low water pressure also can turn ON the water heater. (because certain water heater brand, when pressure is too low, it not able to turn On the heater).
And the price is very reasonable below RM480 before installation cost.

P/S, before using Beebest, I'm using multiple AC Pump Instant Water Heater brands before before but it's very noisy when you use after a year or 2 years onwards...

Hi, may I know where do you the Beebest SP2 ? Since it cheaper than my Beebest SP2 that I installed last year.
Besides that, I plan to change my Euro Uno (AC Pump) with Beebest SP2 within this week. My Euro Uno (AC Pump) is very very loud (few houses nearby also can hear it) when I used it for almost 5 years. And it started to trip to turn off by itself sometimes when i using it. (Electronic defects - Not Electric Shock).

Oh i see. No wonder...
I bought only 1 water heater, therefore, the price is not as cheap as yours.
I get it installed today and it working well. The pump is really silent and the water can be very hot when turn to max.