We decided to add a dedicated return line for our recirc. All of the "use cold water line as a return" systems seem like a hack to me. If you have access to a crawl, basement, or attic I think a dedicated return is the only way to fly: a 50' or 100' spool of 1/2" Pex is pretty darn cheap and worth every penny if you're not fishing from the 2nd floor through walls to a basement. We got the Laing with a thermostat and a timer for energy efficiency, but our plumber did recommend Grundfos.
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Laing, Grunfos and Taco are the leaders. Like cars, plumbers have their preference. I install a lot of Grundfos and Tacos on commercial jobs where engineers spec the products. Laing's are good too, I see a lot of them in homes and they seem extra quiet.
If you run your loop in copper, make sure you reem the pipe, and don't forget the check valves.
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