Heater Element

How do I determine the water heater element power rating and which voltage is more suitable?

I am designing a water heater project and need to know the calculations to determine what power rating element should i get. also, does a higher voltage (220V) work better or worse than a lower voltage (120V)?Please explain which would heat faster?

Voltage makes no difference. The power rating is what does the heating.

Water heaters tend to be 220v rather than 120v because the current is lower for the same power, hence smaller wires and switches etc. Also slightly less losses but not really significant in small heater circuits.

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