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Yes the wire size is larger for that size breaker but will not effect the 30 amp breaker protection of that circuit.
To answer this question the wattage of the heater is needed.
The wattage of the water tank is needed to size the breaker and the wire to feed the tank.
15 amp
Look on the heater and see what amps it is pulling. That will determine the wire size and breaker size. It must be on a dedicated circuit. 15 amps = AWG # 14 wire with 15 amp breaker 20 amps = AWG # 12 wire with 20 amp breaker 30 amps = AWG # 10 wire with 30 amp breaker 40 amps = AWG # 8 wire with 40 amp breaker
Yes the wire size is larger for that size breaker but will not effect the 30 amp breaker protection of that circuit.
32amp 30ma rcbo
To answer this question the wattage of the heater is needed.
The wattage of the water tank is needed to size the breaker and the wire to feed the tank.
15 amp
Look on the heater and see what amps it is pulling. That will determine the wire size and breaker size. It must be on a dedicated circuit. 15 amps = AWG # 14 wire with 15 amp breaker 20 amps = AWG # 12 wire with 20 amp breaker 30 amps = AWG # 10 wire with 30 amp breaker 40 amps = AWG # 8 wire with 40 amp breaker
20 amp
The formula you are looking for is I = W/E.
10/3 wire with 30 amp double pole breaker from panel box to water heater.
20 amp breaker 12 gauge wire assuming its 120 volt
20 amp is perfect, 15 is fine
Usually 30 amp