All,
I recently purchased a 20 Gallon Hot Water Heater (120V) 2000 Total
Watts...... The National Wiring Code stated that it needs a 25 Amp/10 Gauge
Wire.......

Doing the Math (WATTS = VOLTS * AMPS)

2400 WATTS = 120 VOLTS * 20 AMP (12 Guage Wire)

To my understanding 2400 WATTS is more then the Water Heater can pull

Could someone elaborate on why National Wiring Code would not allow me to
use a 12 Guage Wire / 20 Amp Breaker?

Thanks