Geothermal
12 of 15 from Photo quiz: Gear for green buildings
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The answer to the previous question is B, a micro-combined heat-and-power system, which is considered a very efficient technology. This product is called the FreeWatt from ECR International. It's a machine that burns natural gas in a Honda internal combustion engine to make electricity. The heat given off from that power production is used to heat a home. First introduced in 2007 in Massachusetts, the company is now expanding nationally.
Next question: True or false: A ground-source heat pump--sometimes referred to as a geothermal system--heats and cools a home by tapping the earth's heat.
A. True
B. False
Answer and new question on next page.
March 16, 2009 4:00 AM PDT
Photo by: Martin LaMonica/CNET
