Many of us rely on gas furnaces to help heat our homes during the winter. In general, gas furnaces are efficient appliances that provide an excellent heat source. Typically, your furnace releases hot gases that are vented harmlessly out of your home during the heating process. Normally, this is part of the process, and you shouldn’t experience an issue. However, homeowners have noticed water dripping back down the flue pipe in some cases.
Moisture in your furnace’s flue pipe means that the vapor coming from your furnace is cooling too quickly. This condensation is a problem that could create some larger issues. Let’s take a closer look at how to fix furnace flue condensation.
Furnace flue condensation is the process where hot gases cool too quickly before escaping the flue. The gases going up the chimney of the exhaust pipe contain water vapors. Under normal circumstances, the vapor is forced out of the end of the pipe and into the outdoor air before it condenses. However, when something is wrong, the vapor can cool before it leaves the pipe, and the water condenses inside and drips down the flue. Over time, this can lead to corrosion and damage to the entire flue. If your flue is damaged, hot gases could be diverted into your home and create health hazards, including carbon monoxide poisoning.
There are a few common reasons why your flue could have problems with condensation. The problem is that the gases escaping through the flue are cooling too quickly. A flue that is too large allows too much air to circulate. This can make it difficult for the warm gas and vapors coming from the furnace to exit without cooling too much. Additionally, newer furnaces hooked up to existing flues can result in condensation problems because they run more efficiently than older models. Newer models keep a good bit of the heat moving into the home, resulting in a colder flue. Other problems such as lower furnace temperatures can also create a condensation issue in the flue.
By itself, condensation in the flue or vent pipe is not that dangerous. However, condensation can create some dangerous situations. As discussed, over time, corrosion and rust caused by condensation can damage the flue and allow harmful gases to vent into your home instead of into the atmosphere. Aside from this, condensation can eventually lead to water damage around your flue that could damage the roof structure of your home or create other damages inside. Water damage can be expensive to repair and could lead to a complete failure of the furnace flue. Additionally, it could add to the strain on your heating system and lead to premature failure.
There are a few steps that you can take to mediate flue condensation and prevent damage to your home. The solution may be as simple as adjusting the temperature on your furnace. You’ll need to ensure that the furnace temperature is hot enough for the gases to flow freely through the flue and out into the air. If you aren’t sure how to adjust the furnace temperature, you may need to consult with an HVAC technician.
Aside from furnace temperatures, you might have to improve the flue design. If your flue is causing the issue, it could mean that you need to change the design or modify it so that it doesn’t allow the vapors to cool so quickly. The best way to handle this is to allow a qualified HVAC technician to look at the flue and offer solutions for improvements or modifications.
Condensation in your furnace’s flue or vent pipe is not a situation that you should ignore. Over time, it could lead to damage to your home and create a potential safety hazard for your family. If you notice water dripping from your vent pipe, consult with an HVAC professional to help diagnose the problem.