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I have not used one, but I did look around for one a while back. The only ones I found that handled higher voltages were clamp on monitors designed to be installed in the circuit box. The one I looked at was called TED pro home electricity monitor, I just searched for it and you can find it on amazon now.
I was hoping for a lower cost option, since the regular Kill A Watt is only $17. I suppose I could use two of them, one on each leg of the 240V. They shouldn't be using more than 15 amps.