Consider a heat pump water heater. Sized right and in FL you will not likely need to use it in hybrid or full electric resistance heating mode. Most new heat pump water heaters allow one to operate in "heat pump only" mode which will shutout backup resistance elements. But building codes/inspectors will still likely assume the device at it's highest potential power draw.
We replaced our 50G natural gas water heater about 1.5 years ago with a 65G heat pump water heater. In "heat pump only" mode ours only uses 325-425W. In that mode when you run out of hot water, that's it, no resistance heating, just cold water.
We're a family of 4 and each take two showers a day, we do the usual laundry and run a dishwasher. No problems there. We recently had 2 in-laws here in the middle of (our mild) winter and cranked the heat setting up a few degrees and still no cold showers.
'19 Model 3 SR+ (own), '16 Leaf SV (leased), '12 Plug-in Prius (sold 3/19), 11.43kW Solar PV (16MWh/yr real production), 20.5 SEER/13.0 HSPF ducted air-source heat pump, 3.70 UEF heat pump water heater, Induction Cooktop, Variable Speed Pool Pump