Welcome to the forum! So far in 12 years, I've done nothing. I've only had one outage that lasted 4 days during times it was below freezing and I left the tub alone to find it still at 90F when the power came back on. I've since bought a generator that if I had to could run the tub by itself for a few hours. If I ran the tub 2 hours, that would raise the temp around 18 degrees and would last for a few extra days.
