One thing that you might consider. Consider the material the hottub is made from. If you experience very cold temperatures, you might find certain hot tubs might not hold up well when frozen. When used for their intended purpose, they would rarely, if ever be subject to freezing. So in a Utah winter you might find the material could become brittle and easily crack, especially after a couple of years.
Many might be just fine. I just don't know but thought it should be mentioned as a possibility. If you can identify the original manufacturer they might be able to provide some guidance.
Craig