I should add that the higher wattage using 220V had confused me at first.
My only previous experience with dual voltage devices was all with motorized woodworking machines. Operating a motor with single phase 220 instead of 110 cuts the amperage by half, and power consumption stays basically the same. Higher voltage, lower current means a thinner (less expensive) gauge wire can be used without excessive voltage drop on long runs.
The difference is that changing the motor voltage requires rewiring the two sets of field coils, so it is really a different load. The coils are wired in parallel for 110V and in series for 220V. If a coil has resistance (impedance) R, two coils in parallel have a total resistance of R/2, but wired in series the resistance is 2R (four times as much). Voltage doubles, but power usage stays the same.
Our printers have the same resistance for both voltages, so power consumption goes up by the square of the voltage.