Hey Jamie - Wattage is calculated by amperage drawn multiplied by voltage Eg a 660 Watt motor designed to run on 220 Volts draws 3 amps while the same 660 Watt motor designed to run on 110Volts draws 6 amps. Its just a matter of using the appropriate motor for the voltage supplied. Usually the models all have the same Wattage motor, just designed for the Voltage they are required to use.