Originally Posted by k corbin
New fitting for sure but one does wonder why the temperature increase at the toilet? Not that the temperature issue has be solved if a new fitting solves the issue of it popping off. It is just one of those odd curiosities of why?
Yes, that is what I was trying to suggest in my post, two or three above. The hot water will circulate by gravity, if there is an unrestricted loop in the piping, even if the elevation difference is just a few inches.