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The only problem I had with them and teenagers is that once they find out that the hot water is endless they tend to use it. A 10 minute shower can turn into a one hour sauna.
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X2!!
Not just teenagers, wives, too! ;^p
This reminded me of another caveat; if the power goes off you'll be instantly out of hot water. Here in TN it goes off a lot from storms - when one should not be in the tub/shower anyway (insert Darwinism joke here). That said, we have never been affected by power loss>>no hot H2O.
In Fla, especially in a two-user household, you
may be able to get away with the 120v/60A system (meaning no additional wiring beyond what the original HWH used). Does your supply feel colder in the winter? Do you even HAVE winter? If not, I advise you to measure the incoming water temp, and your GF's shower temp (seriously). The spec sheets will tell you what temp rise is possible at a given flow rate. Add the supply temp to the temp rise; if it's > GF'sST ( GF's shower temp), you are safe!
I originally wanted a gas-powered unit, too. They are at least 2X the cost of electric but last several times longer. The install in my house would've been more complex. (anyone going with gas, get one that ignites without AC power. There are several with battery-powered ignition, and some even generate the power using a tiny water powered turbine)!