I have observed a potentially serious problem, at least in the Sears water
distiller which I have.

The problem: When the unit is plugged in the entire inner stainless steel
container carries full line voltage. I measured the voltage from the water
inside the shell to ground (stainless kitchen sink) and it was 123 volts ac.

In normal use this may not be a problem, as the plastic outer case of the
distiller insulates the inner container. However, if the unit is left
plugged in while refilling it there could be serious risk.

I don't know if this is a general problem, or just a problem with my unit. I
intend to ask Sears that question.

Meantime, be aware of a potential safety risk!

All the best,
Dean