Sorry for delay -- I did test it out and the heater does appear to be working (water out of the hot tap was warmer than the cold tap, but not hot -- assume it has to sit in the water heater for a while to actually heat up that much). The strange thing was the light next to the water heater switch didn't light up, which I expected, but maybe that only lights up when there's a problem (it does say "reset" on it). Sorry for my ignorance, this is my first time using the heater.
Anyway, still wondering about that mystery wire.
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