I (when MUCH younger) did a simple test.  Put two
electrodes into a
 container of distilled water.  Measure the current flow..... 
  Under the best of cirsumstances I was able to get
about 3 minutes of
 negligable current flow.  Then it would rise rapidly until if popped
 a breaker, blew a fuse, generated smoke (burning wires), or exploded
 ( Do NOT drop a pinch of salt into the water while running this
 experiment.......) 
Interesting.  I have a humidifier that, as far as I can tell, works by
running mains current through tap water to heat it up to boiling.  I've
opened it up and looked, and, electrically, that's all there is to it:
just two long metal electrodes connected to the mains, dipped into the
water.  Works well for its design purpose.
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