I have other info from a very reputable breeder - Doug at Deer Fern Farms.
The normal body temperature for a uro is around 105 degrees. Soaking them in anything cooler than 95 will drastically lower their body temperature. That's not a good thing especially if the uro has a weakend ammune system and should be kept warm. The water should be on the hotter end of warm, but not hot enough to steam. It should feel like really warm bath water.
I always bathe my uros in 100 degree water - per Doug Dix. They love it. Once, by mistake, I had the water too cool (I also have beardies and they like the water a little cooler) and my uro almost jumped out. It was like he was saying "It's too cold!"
Hope this helps. I trust all the info I get from Doug Dix. He has been working with herps for many years and really understands their needs. If you would like to verify this info, visit Doug's site at www.deerfernfarms.com and look at his care sheet. 
Veronica
Beautiful Dragons