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Watts = Amps x Volts for a resistive load like a water heater.
None.
That would be one huge wire!. I've never seen a tankless water heater being powered by a single wire. They are usually 3 separate 40 or 50 amp circuits that use three separate 2 pole breakers. Check your wiring diagram that comes with the unit.
The GE water heater SE50M12AA01 is a 5500 watts or 5.5 Kilowatts water tank. The amperage on such a tank is I = W/E. Amps = Watts/Volts. Since most hot water tanks in North America use a voltage of 240, the amps will be 22.9 amps. It must be fed with a #10 conductor from a 30 amp breaker.
7.5 -10
A typical domestic water heater uses 3 kW. On a European 230 v system it would use 13 amps.
Watts is the amount of power the heater has and amps would be the draw- if it is a 120 volt heater than the amps would be 12.5 amps and it is instantaneous
30
the simplest solution is by connecting two 120v 3amps heater in series , the same can be used directly on 240v. However the current drawn will still be 3 amps & Not 1.5 amps. The heater output power will be double that of a single heater running on 120v. ( or equvalent to two heaters operating on 120v. supply ) A more expensive method is to use a stepdown transformer which can be powered on 240v & connect the heater on the transformer 120v side. this method will consume approx. 1.5 amps from the 240v supply.
To answer this question the wattage of the block heater must be stated. Amps = Watts/Volts.
The heater should have a wattage rating (very few list amps). Calculate the amps using the wattage and voltage. Amps = Watts/Volts(480).
depends on voltage.... 120volt = 8.33 amps , 240volt = 4.17 amps