We are building a new house. The master bath is the furthest spot from the tankless water heater. The builder is specifying the WaterQuick Premiere circulation pump with the bridge valve. It looks like it has a water flow sensor. So to activate it, it looks like you give the faucet a quick turn on/off on the hot water side. Which activates the pump and will run until the bridge valve shuts down the flow (meaning the hot water is reaching the bathroom). My issue with the bridge valve is that now I'm pumping warmed water into the cold side, so if I want to get a drink from the sink while this is running, the water will be almost hot coming from the cold side, right?
I have asked the builder to do a dedicated return from the furthest point and then put the pump on it, with a smart outlet that I can then either time when the pump will run, and/or a button in the bathroom when we walk in.
Am I thinking too much into this? Which would you do in a new build?