Furnace exhaust pipe condensation. Many times furnaces have their AFUE rating printed on a yellow energy guide sticker on the unit. In such cases the vent should be insulated andor a self-regulated heat tape installed. If your furnace has white PVC exhaust pipes you have a condensing furnace. A conventional furnace should exhaust the hot gases of combustion through the roof vent above your home. If you notice any bubbles where water is leaking from your flue pipe its important to have a professional inspect the pipe and your home for carbon monoxide leaks. If the flue is made of PVC pipe you have a high-efficiency furnace also called a condensing furnace. If a furnace is installed in a vented crawl space or attic the condensate lines and trap can freeze if temperatures drop low enough.
How do I stop my furnace exhaust pipe from freezing. This condensing process along with the one that occurs within the high efficiency furnace itself creates moisture that can collect and freeze around and inside exhaust pipes since it cant travel far enough. Because so much heat is removed from the gases and used to heat your home hence the high-efficiency rating it cannot rely on natural draft to exhaust flue gases through a vent. These types of installations should have a self-regulated heat tape. Condensation in the flue or vent pipe is not dangerous in itself but can create a dangerous condition. This pipe directs combustible gases away from your home. When exhaust gases discharged from a high efficiency furnace exhaust vent meets the cold air the air condenses faster than conventional furnaces because it is cooler. As the exhaust product cools it produces condensation.
Plugged condensate drains. The flue pipe needs to be insulated to keep it hot either replace with double wall pipe type B flue may be enough or wrapped with a FIRE PROOF insulationYou could change the pitch raise the close end but that will just run the water back down to the furnace not likely to be good.
Simply put condensation is responsible for liquid in furnace vents. When a high efficiency furnace releases the exhaust gases condensation is created. The condensing furnace produces condensed exhaust gases that contain water and carbon dioxide which together form carbonic acid that results in a corrosive condensate. The condensate trap is absolutely mandatory for a high-efficiency gas furnace. If your furnace exhaust pipe is leaking condensation it could also be a sign that your pipe is leaking gas which is not a small issue. If your furnace has a metal exhaust pipe you have a conventional furnace. If the exhaust pipe leaks the water vapor in the exhaust gases can condense on the vent pipe and leak back into your home. The furnace uses an exhaust vent motor that pushes the exhaust gas through the vent pipe creating a positive static pressure in the vent.