Inflatable hot tub?

Late to the party but my sister recently moved and gifted us her round Coleman hot tub. She used it for 2 years. We set it up on our front covered porch (reinforced of course) and it has been awesome. Keeps stable temp at 102. Manual says not to use under 40 degrees outside temp but she did without issues. We will give it a shot this winter and see what happens. Years ago we had a gifted full sized hot tub and it was unreliable and expensive to run. Very happy with the Coleman after 2 months.
We run ours all winter long and we've had ice storms and so forth of course it's undercover but as long as it's running and circulating there's almost no chance of it freezing at 102 plus. Also we keep like in the picture a little coverage of the pump stays warm as well. I think what they're trying to say is they don't want you to let it freeze and stand still. Ours has to be unlocked every day or else if it goes past a day and a half it will turn off and that's what you got to watch for..