The Coleman Echelon furnace series is available in four models. The mid-efficiency series is available in constant speed (8.M) and variable speed (8.C) models operating at 80 percent AFUE. In the high-efficiency, Energy Star-rated series, the constant speed (9.M) is available at 97 percent AFUE and the variable speed (9.C) model at up to 98 percent AFUE.
These furnaces use induced combustion, a hot surface ignition and aluminized tubular heat exchangers. As modulating furnaces, they fire at 1 percent increments for maximized indoor comfort. The variable speed models come with an optional ECM fan motor that circulates air for long periods of time to improve air filtration and maintain consistent temperatures throughout the home.
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