Heat pumps achieve energy efficiency by

Posted on December 20, 2011

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Heat pumps achieve energy efficiency by moving heat around as opposed to liberating it—the heat for the next batch of water to be heated is reclaimed from the warm, humid air being exhausted. Heat energy comes both from cooling the air being exhausted from about 72° F to 42° F (sensible heat reclamation) and from the condensation of the water vapor back into a liquid (latent heat reclamation). Heat pump water heaters use 30 to 50 percent of the electricity consumed by conventional electric water heaters

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