After installing the recirculating hot water line I tested the plumbing. Always a relief when your plumbing doesn't leak. : ) Shower valve is in place with sturdy blocking behind so it doesn't move. After this photo I insulated the recirc pipes inside the walls to keep that hot water hot as it goes back to the heater. I have high hopes for this system to keep the hot water flowing to the shower with less propane than if we just heated the water and sent it along.