My Tub has been at 102 since Christmas. I have not been using it that much and probably will not for at last 2 weeks. I turned the temp down this morning from 102 to 80 degrees. It is one of the coldest days of the year right now and i check the tub. in about 8 hours it lost very little heat. Went from 102 to 97. I thought that was pretty good.