Connecting a separate 110v source without physically disconnecting the 220 circuit is an accident just waiting to happen. You may not be the person who flips the circuit breakers back on.
As for boiling water, if 1KW is consumed long enough it can increase tank temp to boiling point, but it will become way too dangerous long before that point. As hot water over 125 degrees F represents a scalding hazard.
You're the one making a statement about not wiring in a thermostat.
ASSumption... that you're starting out HW filled with 70 degree water.
Which is an improbable event to reoccur more than once.. Most people won't tolerate 70 degree shower for very long. Hot water in the heater isn't going to magically cool down to ambient overnight.
For how many days???
2 days... 4 days.... a week... two weeks... ???
After Wilma's eye wall hit us hard (twice).. Our area was without grid power for 13.5 days ! Next block over was without grid power for 17 days !!!
Each morning I ran genny for 4 to 5 hours, make Breakfast & lunch.. power frig's, charge bat's..
And another 4 to 6 hours in evening, power frig's, make dinner, hot water(for morning showers), charge bat's, watch some TV.
For the most part, it took 110v mod running w/genny just a couple of hours to bring a 30 gal WH back to it's thermostat set point and disconnect.
ASSumption.. that you have a small fuel tank and you don't refill it. ASSumption.. that you are always aware of the temperture of water in HW heater.
Bypassing critical safety features is a good way to hurt someone..
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