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I'll take advantage of Mark's diagram to show how my system is arranged.
My WH is in the basement and the sinks shown are in the 2nd floor master bathroom. It used to take a long time to get warm...

Thanks Mark!
The plumber said that this particular WH didn't have heat traps, but I had to see for myself. While it was awaiting hook-up, I ran a long plastic rod down each of the water connections...

I'm replacing my 27-year-old water heater (finally) and want to maintain the function of my gravity-fed recirculation system.
The heater is in the basement, and the crossover loop is in a 2nd floor...