Circulating Pump
mobile7 (Platinum member) > albums > H.V.A.C.--> D.H.W.
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In larger buildings where the taps that supply hot water to the end users are some distance from the water heater it could take considerable time to get the hot water to the tap. In this case a return line from the tap that is farthest away from the heater is provided to keep hot water circulating in a loop back to the heater. This means that when the tap is opened there is hot water instantly so you don't waste a lot of cold water down the drain just waiting for the water to get hot.
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