problems with hot water recirculation
We just moved into our newly constructed house. The house was pre-plumbed for a hot water recirculation system. I installed a Grundfos 10-16 pump along with an indirect fired hot water heater. Problem is, the pump doesn't seem to do much at all, if anything. It takes several minutes at the second floor bathroom
I have a hose bib installed between the pump and the hot water tank. When I open it and let it run until all the water is hot, all the faucets in the house have hot water. So I assume the plumbing was done correctly.
I'm beginning to wonder if the pump is too small or there is some other installation problem. The pump is installed vertically, about a foot above the cold intake of the hot water tank, which is located at the bottom of the tank. The house is two stories, 1800 sq ft on the first, 1000 on the second, and the hot water tank is in the basement.
If anyone has any experience with these systems, I would sure appreciate any tips or things to avoid.