A better bet for most homes is POS (point of service) electric models, but then you have to have wiring and circuit breakers run to handle that load as well.
@FoFa: Thanks for clarifying what you meant by POS, because, as I was reading it, I had something else in mind contemplating an electric water heater. Good old gas tank water heaters are cheap and generally last a long time. We are lucky in that we have two upstairs; one sources the utility room, kitchen, and one upstairs bath while the other sources the master bath and other upstairs bath. We always have hot water quickly and plenty of it.My BIL replaced his with a tankless for the whole house, but it cost so much I don't see why anyone would do it.
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