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When it comes to biomass stoves, nonsolar water heaters, and eligible heating, ventilation, and air-conditioning units, the government will allow homeowners to include the cost of installation as well as the price of the products to reach the $1,500 tax credit in 2009 or 2010.

Energy Star's Karen Schneider says that manufacturers of certain types of gas water heaters don't have an eligible product on the market yet but will soon. "Congress wrote this law to drive the market toward greater energy efficiency. The purpose is to give people an incentive when they are going to buy something to buy the most efficient version of it," Schneider says.

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Last updated May 07 2009: 12:57 PM ET
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