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TORRINGTON--13 September 2008--091308TJ13 - The heater is about 95 percent efficient at burning natural gas because it retains the exhaust from the initial combustion until as much heat as possible is generated from the exhaust, which is then vented as steam, seen at a tour of a house on Tognalli Drive in Torrington that was built with environmentally friendly materials and aimed at lowering the resident's environmental footprint, on Saturday, September 13, 2008. (T.J. Kirkpatrick/Republican-American)