Greetings,

Can somebody fill me in on which model/what size/capacity circulator pump I should use for my configuration?

I have +/- 600sf of 6″ concrete slab floor in a shop with about 750′ of 1/2″ pex tubing installed in 3 circuits of 245′ each.  Floor is insulated with foam below and on the perimeter, 2×6 walls, R21, modern windows and doors.

I want a pump to run the three circuits as one zone, from one supply manifold to one return.

It’s an open system with the potable water, has to be a bronze or stainless pump.

I’m using a Noritz tankless h20 heater that’s good for recirculation.

Thank you for any input.