I have a Rheem heat pump water heater model number #PROUH50 T2 RU350 DCB with a Grundfos hot water recirculating pump model number #UPS15-55SFC/LC. The pump has been replaced 2 times already and it still doesn’t move any water. Attached is a connection diagram of the system. The flowmeter and thermocouples are used for energy monitoring on the whole house. The cold water supply has a check valve not shown in the diagram to prevent the recirculating return water from going back into the cold...
Hot water heater recirculating pump
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