To answer the actual question, I think the problem is in the calculation of watts. Regardless of who's total resistance is most correct, they're all in the 9.something range. 9.something line amps operating in a 240V circuit will yield somewhere around 26 amps, and that will result in roughly 6,400 watts (ballpark answers).

Radar

There are 10 types of people. Those who know binary, and those who don't.