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Transformation of the Week by:
Although heat-pump water heaters have been around for 25 years, they've caught interest in the past few years as energy prices have spiked and as a number of manufacturers have introduced integrated appliances (as opposed to the retrofit units that made up the market previously). Heat-pump water heaters create hot water from warm indoor air and are fueled by either electricity or natural gas. The heat pump warms water in a storage tank by compressing and expanding refrigerant in a closed loop. As by-products, the heat-pump water heater generates cool, dry air and condensate. While heat-pump water heaters can be expensive, the cost can be minimized through federal tax credits and reduced energy consumption.
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Requirements: 1 metal roof, 2500 gallons of rain, and the desire to save the planet
Instant water heaters save energy and offer endless hot water, but not without some problems. A small tank and a big pump can fix the flaws.by Michael Chandler
A solar water heater and radiant-floor heat maximize efficiencyby Michael Chandler
With new pump technology, hot-water recirculation is about to get more efficientby Dave Yates
Submersible vs. pedestalby Don Burgard
Watch the Passive House video series
Play the Inspector Game!
Transformation of the Week Gallery
Sioux Chief -
Stainless-steel, height-adjustable drain
Nontoxic powder solidifies water into a gel
Woodford Manufacturing Co. -
Woodford's exterior faucet is equipped with an integral pressure-releif valve and boasts a burst-proof tube
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