I don't have much to add. I think you need a volt gauge to go along with the amp gauge. Makes calculating the watts more accurate than just going by what the wall plug is rated at.
As for the elements I would expect they would need to be insulated somehow to keep them from turning the matal housing into a shock box. Remember the element heats because of the electricity runiing through it. That elecricity may arc to the surrounding metal and kill someone of they touch it and ground it out??? I may be totaly wrong, but it would sure suck if I was right and you found out the hard way!
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