W1 = 230V * 13A = 2990
W2 = 120V * 15A = 1800
slight bit more power in the 220-240v at 10-13ish amp system than 120 @ 15
EDIT: oops, just realized that these are likely electric kettles. I was thinking of the stovetop variety.
the kettle i just bought on the weekend draws 2300W
W1 = 230V * 13A = 2990
W2 = 120V * 15A = 1800
slight bit more power in the 220-240v at 10-13ish amp system than 120 @ 15