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Units have an afue of 90 percent or higher

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. Boiler technology has changed tremendously since you likely bought yours ten or.

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