The water heater designated as WH-1 connects to a domestic cold water supply line sized at 2 inches and a domestic hot water return line designated as DHWR sized at 1 inch. The piping arrangement includes a 1-1/2 inch branch line equipped with a circulator pump, check valves, and isolation valves. Additional branch connections are sized at 3/4 inch and 2 inches to distribute water throughout the system.
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