in the process of redoing master bath at sons home. Master bath is furthest point from water heater.
What should we do now to add recirculating pump?
Are the Grundfos systems any good?
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.
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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