I am sure glad i put a GFCI for my tank circuit, a few weeks ago my son fell off a chair and crashed head first through the tank, while i was at work also an electrician. My wife rushed him to the hospital but didnt think to check if the tank was shut off, all the pumps and heaters running without water could have caused a fire, but the GFCI tripped possibly saving my son from a shock and possibly my house from a fire. Most tank manufacturers recommend you use a GFCI.
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