This plumbing design requires the hot water side of each fixture (faucet, shower or other appliance) be placed in a continuous loop by connecting a hot water return line from the last fixture to the water heater.
Grundfos Hot Water Cast Iron Ciruculator 25 GPM # UPS26-99FC (C) Grundfos In-line Hot Water Circulating Centrifugal Pump Cast iron, in-line, single speed, closed system hot water circulator. Quiet maintenance-free performance. Low energy consumption, . UL/CSA listed $270.00
Grundfos Hot Water Cast Iron Circulator 31 GPM # UP43-75F (C)Grundfos In-line Hot Water Circulating Centrifugal Pump Cast iron, in-line, single speed, closed system hot water circulator. Quiet maintenance-free performance. Low energy consumption, . UL/CSA listed. $298.00
Grundfos Hot Water Bronze Circulator 7 GPM, UP15-18B5 (C)Grundfos In-line Hot Water Circulating Centrifugal Pump. Bronze flanged housing, in-line, single speed, open system hot water circulator. Quiet maintenance-free performance. Low energy consumption, . UL/CSA listed. Flanges, timer and aquastat must be ordered separately $187.00