Condensing Furnace - Freezing Condensate on 3 Degree Day
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- Опубликовано: 19 фев 2015
- Frozen stalagmite icicle on a 3 degree day from the condensate from a natural gas condensing furnace. Check out how high the stalagmite gets near the vent!
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old post i know, but this tip saved us! never thought to check the exterior condensate drain pipe for ice. thank you!
We're so glad you found this to be helpful, Cassie! Thank you!
the intake on my 90+ furnace was freezing up, watching (while running) from outside the house, exhaust pipe was blowing down , intake was picking up moist air, and creating ice to form on intake, so I sawed off last second pipe elbow allowing the moist air to blow straight out away from my house, and away from intake pipe and that stopped the freezing problem
Just checked mine and there was a cone about 8" tall, also an icicle hanging from the TOP inside of the exhaust pipe. It is 20 below here right now.
Is that a category 1 furnace? Or is there another category that it is?
Came here cause I have a 3 foot high ice tower under my exhaust vent and was wondering if that was normal. I guess it is so no worries. Just never seen it before. Weird.
I get water in my basement that comes in bottom of foundation ... it would be right if I drew a straight line down from pipe to ground. Old house has cinder block as foundation . Not enough for a sump pump but annoying.
Where is the air intake pipe?
The ice will never get to that level. The exhaust gas is several degrees above freezing and will continue to melt anything below it.
I beg to disagree. I have this exact problem happen twice since I got a new heater.
The air coming from the exhaust is about 90F-100F. The ice may get close but will never get touch the PVC unless your furnace is off for several hours and condensation continues to form and drip. But if that's the case the water will freeze inside the pipe until the next furnace cycle. We never see ice back up issues its clogged intakes from the snow that's the main issue this time of year. It's been -15F here for the last 2 weeks and ice isn't a problem at all. (Ont Canada)
I had to kick mine clear yesterday morning. The exhaust may be 100F when it comes out, but it loses this as it gets farther away from the furnace. I guess by the time it exits my house it's cool enough to condense and freeze in a pile. This can and has happened.
Just for fun put a temp meter on the exhaust pipe. I bet its still 80F plus by the end of the pipe unless your pipe is 50 feet from the furnace. I think you will be surprised how hot that exit exhaust is.
What you have is a different issue. Yours is on the intake side. That is an issue. I'm surprised the furnace ran. The new high efficiency furnaces are so sensitive that even a small amount of snow in the intake pipe shuts them down. Its our number call this time of year. You shouldn't have condensation on the intake side.