Hi. First post.
I'm renovating a bathroom and have had a thought of using 3/8" pex for the cold line to the shower. Why can't I run a loop of that same 3/8" pex through the floor of the shower, on it's way to the cold water valve, to recover some of the wastewater heat? It will be thinset and tile, anyway.
I know the efficiency will be small but the cost will be almost zero and I don't want the floor of the shower to be uncomfortable.
The hot will be 1/2" pex and I run an anti-scold valve to limit water temps to about 115*F. We don't generally mix in much cold water, anyway.
What do you think? Please be gentle. lol!
