Even plug and play spa's can usually be hard wired as well, just means running electrical to it. Power wise being in so-cal you could probably get away with running it in an economy mode ( heats during filter cycle) instead of a std mode (heats when it calls for heat)
How long to heat up here in the PNW summer time a day and a half if that to 102* Down there with 60* water out of the tap, guessing a day or less?