We all know that modern high-efficiency (90%+ or “condensing”) furnaces save energy and money. They can provide comfort with little noise. But how do they work and what do they look like inside? The Condensing Furnace Advantage A condensing furnace provides extra efficiency, as compared to an 85% furnace, by condensing the steam in the products of combustion into water. We can calculate precisely how much energy is saved from going up the chimney as steam (Illustration H096). Illustration H096. Btu - Condensing Furnace. Older condensi ...
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