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Units have an afue of 90 percent or higher these

Units have an afue of 90 percent or higher these are increasingly becoming available only as condensing boilers they trap much of that heat waste and use it to preheat the water, which ensures that the system runs on less energy a condensing model often loses only about 2 to 3 percent of its heat when all is said and done however, the trapped heat doesn’t count towards the afue. Before calling a plumber, try to unclog your drains and toilets yourself.

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