Automatic Booster Pump while anyone is using the shower(s)

[aaiyar]

@danabw

We don't run the water while the pump is getting the warm water to the other end of the house. My understanding of the Warts system uses a bypass (which we've installed in the sink on that same line) so that the water can flow through the system while it's getting the hot water to the other end of the house. Have I misunderstood something?

Correct. That's because it is a recirculating pump with a bypass that ultimately leads back to the water heater

My comment was directed at running a pressure-increasing pump with no flow that the OP had.