I do have a UTH on one side of the tub (yes, its the 28 qt plastic container) but I was having issues keeping the ambient temp. up, so I got a CHE for it and it worked great. Have had it up for over a week without issues. I was keeping an eye out to make sure it wouldn't be a problem and I haven't seen one so far. Its currently about 1/2" away from the actual tub.