Hi Orv,
All units should have a dedicated water heater breaker, I think people are complaining that there is no inside switch for shutting off the 120 volt power.
Another way, (and easier) of shutting off the hot water heater on 120 volts is to cut into the on-off switch outside, and installing a switch in that line. The wires will be accessible inside the unit on the backside of that flange.
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