Benefits of Demand-Controlled Pumping
September 11, 2006
An electronically demand-controlled pumping system sends cold water back to the water heater until hot water arrives at the sink, shower, or other fixture where it is needed.
Much water and energy is wasted in residential buildings, due to poorly designed, poorly installed—and therefore poorly functioning—hot water delivery systems. Homes built in the United States today are typically larger than ever before and include a number of hot water fixtures not seen a generation ago, such as second and third bathrooms and spa-style showers. And water heaters are typically far away from many of the hot water fixtures. All this adds up to long waits for hot water at fixtures and water and energy down the drain to no purpose (see “Hot Water Runs Cold,” HE Mar/Apr ’05, p. 28).
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