The Lowboy Top Connect 38-Gallon Electric Water Heater, such as the A.O. Smith ENLB-40 model, typically uses two 4,500-watt heating elements operating at 240 volts. To calculate the required amperage: [ \text{Amps} = \frac{\text{Watts}}{\text{Volts}} = \frac{4500}{240} = 18.75 \text{ amps per element} ] Since both elements don’t run simultaneously, the unit usually requires a 30-amp double-pole breaker with 10-gauge wire, which is standard for residential electric water heaters of this size.