I’ve looked into one as well and the common use I’ve seen is putting the recirculating pump on a timer and set that for common use times like morning and evening showers and off at all other times. Depending on the pump, you can have multiple valves since each can run independently. Common complaints I’ve read about the cold line usage is it takes some time to get the cold water cold.
CyphirX t1_jdjcpro wrote
Reply to Recirculating pump for tankless water heater by GeekX2
I’ve looked into one as well and the common use I’ve seen is putting the recirculating pump on a timer and set that for common use times like morning and evening showers and off at all other times. Depending on the pump, you can have multiple valves since each can run independently. Common complaints I’ve read about the cold line usage is it takes some time to get the cold water cold.