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This picture shows a furnace flue with condensation problems. Flue condensation problems are caused by hot gases cooling too quickly in the flue. As the hot gases cool moisture in the gases condense and start dripping back down the flue. Flue condensation problems can be solved by making sure the gases are hot enough to be vented into the atmosphere before the moisture condenses in the gases. It could be a problem that requires a slight adjustment at the burner. It is a good idea, when you observe a furnace flue condensation problem where the condensation is dripping back down the pipe, to call a professional for to analyze the combustion process and make the precise adjustments necessary to prevent this problem. Condensation dripping back down the flue causes flue to prematurely corrode and rust. Flue condensation problems, if left alone, can cause the flue to rot and vent hot gases in an area where it could be very dangerous to the occupants of the building. There is carbon monoxide present in these gases and carbon monoxide is very dangerous.
Flue condensation problems have been observed on all kinds of furnaces including gas and oil furnaces. If you have this problem or see it on your furnace heating system please consult a professional.
