If you have a high efficiency condensing furnace installed at home then you should know that it is a little more complex compared to the traditional ones. The working is exceptional, but the problems surfacing from the high efficiency unit is also very different and needs to be handled professionally. These are known as condensing furnaces because of the second heat exchanger that extracts additional heat from the air passing through the first heat exchanger. This heat extraction process cause water vapor to condense out of the air which is drained through a tube placed in a floor drain. It is easy to identify this high-efficiency furnace through this drainage tube.
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