re: Gas/Electric or tankless water heater

quote:

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why have a gas tank on one circuit?

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I know the question is not addressed to me but this my rationale and experience, with a standard no frills gas tank water heater you still have the availability of hot water during prolonged power outages on demand - no electricity involved/required. This was my case in Ida, Gustav, the Feb ice storm power outage and every other hurricane related extended power outage I experienced as child and adult growing up and living in south LA. This is why when I replace my 2 natural gas tank water heaters in a couple months I’m keeping 1 natural gas tank water heater on a separate circuit.

With a gas tankless you still require a 120 V power source for it to operate and produce hot water, or battery backup to power the electronics.

Of course if you have whole house generator (I don’t) or if you power the 120 Volt circuit for the gas tankless with a portable generator then i suppose it becomes a moot point.