I am considering adding a hot-water recirculation system to a residential re-piping job I am planning for my home. Due to the design of the home (two stories with full basement and full attic), the re-piping will serve the second floor from an attic manifold (near the water heater)and the first floor from a basement manifold (17' distant from the water heater). The water heater is located on the second floor.
I need to know what pump (specs, brand/model, if possible) should be selected for a 3/4" recirculation loop, where the lowest point of the loop will be approximately 17' below the water heater return. Also, where should such a pump be placed, at the top of the loop or bottom, or does it not matter? Any other considerations?
P.S. Code does not permit second water heater in basement, due to waterfront flood zone, so that solution is out.
Thanks in advance.