altherma hydronic system by daikin
Photo: Courtesy of Daikin
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Tech: Making Hot Water Out of Thin Air

Altherma Hydronic System by Daikin

Why mess with a heat pump that generates only hot and cold air when one system can supply AC, hot water, and heat through a radiator or radiant floor? That's the level of innovation we're talking about. This system's efficiency rivals the best geothermal heat pumps—minus the pain of underground piping.

About $19,000 for a 54,000-Btu system, intstalled; daikin.com
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