Whenever we use hot water, most of the heat in it is lost as it goes down the drain. Drain-water heat recovery systems can be used to recapture a significant portion of that heat through the use of a ____.

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The Answer of Whenever we use hot water, most of the heat in it is lost as it goes down the drain. Drain-water heat recovery systems can be used to recapture a significant portion of that heat through the use of a ____.

Whenever We Use Hot Water, Most of the Heat in It