Here in Colorado, we have a number of “hot springs” (Manitou, Pegosa, etc) that are 100 deg F or hotter. Here is a map from the Colorado Geothermal Survey that shows several of these active areas.
Well, there we are. Let’s drill ‘em! Out with tourism, and in with geothermal!
;-)
I know there’s at least one geothermal plant in Utah that works under similar temperatures.
I used a restroom at some place near Mt. Princeton.
The only time I’ve ever used a toilet which used hot, very hot, water to flush.
It was filled via stainless steel pipes (about 2” diameter) laid on the ground. Guess there was no problem with freezing in winter.