QUOTE(barca96 @ Jan 30 2020, 03:45 PM)
I'm only choosing between this 2 brands for my storage water heater;
Joven due to the brand
Hydro1 due to its claims on safety and savings
Price breakdown
Joven JH25 RM550
Joven JH35 RM660
Installation RM150
Total RM700/810
Hydro1 Eco RM800
Installation RM300-400
Total RM1100-1200
However the price points are too far off.
Not sure if it is worth it to top up at least RM400 for Hydro1.
Are their claims of both the safety and savings really hold any water?
From their website, it seems that Hydro1 is only "saving" because it is using a smaller 1.5KW heater. If using a small capacity heater, it will need to run a longer time to heat up the water. In the end the power consumption will be the same.
For example, if using 3kW, you'll run 1 hr. But if using 1.5kW, you'll need to run 2 hr. The end result is still the same, 3kWh.
There's also some water heater that says it is using DC heating element to heat up the water and also energy saving. But it doesn't save more compared to conventional electric heater. AC or DC, the power consumption will be the same regardless of the voltage as the heating energy required to heat water is fixed.
For information, to heat up 30 litres water by 25degC, will need about 0.87 kWh of heat. As long as it is heating element type, it will need to use 0.87 kWh power input.