Grundfos Circulation Pump - 110v - $300 (guaranty chevrolet santa ana)
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type: UP 15-18 SU part # 59896127 P3 class F 10 micro farads
typically to keep hot water available on demand
no more waiting for the water to get warm
designed for indoor use only
used for 2 days to pump / empty dead h/w heater in basement...