Andys maths looks pretty right to me. A large plasma could easily be that much power but a 32" which basically has to be an LCD is unlikely to be anywhere near that.

MY first thought was a Kill-A-Watt type meter too.

And are you sure about those percentages? 2% for lighting seems unreasonable.

Water heater?
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Christian
#40104192 120Gb (no longer in my E36 M3, won't fit the E46 M3)