Shower pre-heat idea

Tom Brown · 03-10-14, 02:43 PM

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!

03-10-14, 02:43 PM	#1
Tom Brown Lurking Renovator Join Date: Mar 2014 Location: Regina, SK Posts: 1 Thanks: 8 Thanked 0 Times in 0 Posts	Shower pre-heat idea 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 115F. We don't generally mix in much cold water, anyway. What do you think? Please be gentle. lol! Last edited by Tom Brown; 03-10-14 at 02:50 PM..*