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I believe mine goes to 101. I also keep mine at 104 this time of year, just went out to get in and it is freezing rain. I don't mind snow, actually like tubbing in it, but have to pass on this stuff.
I believe that my HS Envoy resets to whatever you had the temperature set to (102 for us) and 24 hr. filtration, of course. One less thing to worry about in a power failure!
I'm pretty sure that my Optima goes back to the last set temperature. The spa is powered off several times per year for water changes and stuff, but I never have to re=adjust the temperature.