Flue Condensation

Wonk_2

Ok... More info... I don't believe that the condensation is running all the way back to the boiler, I seperated the flue at a joint back near the boiler and saw none of the significant corrosion that there is as it runs through the cold part of the house... Whether there is a low spot somewhere (it doesn't appear to be so) or the flue gases are hot enough to revaporize the water as it runs back, I don't know... I don't mind just letting it rust, but I have a couple worries about it... 1: While this is in a part of the house that is not currently lived in, it is being worked in and we go in there often... I don't want the flue to corrode enough to fill the place with CO... 2) I'm worried about corrosion attacking the power vent itself, those things are damn expensive...

Wonk_2

Flue Condensation

Im a homeowner with a system 2000 boiler and baseboard heat... The Sys 2000 is powervented through a pretty long run of flue, but it had never been a problem... Rencently we started a significant remodel which entailed ripping out walls, insulation, etc for about half our house... The flue is not exposed to the weather, but the part of the house it's in is, for a while, unheated... Since it got real cold there's been obvious flue condensation near the end of the run with corrosion around the sheet metal screws... My question is, how can I prevent this for a month or so until the house is insulated/heated again??

Charles G.

Condensation

Is this an 80% OR 90% unit? Usually, 80% units spec double wall B-vent to the chimney. Most 90% units use PVC or stainless. 90% units usually have lower flue gas temps which would permit some type of insulation as a TEMP solution. Not sure how to advise you with the information given. It's curious how often we are asked how many mistakes can we make so they cancel each other out and make something work.

Frenchie

system 2000

Charles, the system 2000 is an oil boiler. it can't be 90% or PVC vented. I'm not sure what to recommend in this case though. My initial thought is to just let it rust the pipe, and then replace it once the remodel is complete. I'm sure most would disagree with this, however. I don't know if this could do any harm to the stainless heat exchanger featured in this boiler.

Frenchie

Wonk

I'm surprised that nobody else has replied. If the condensate isn't going back to the boiler I definitely wouldn't worry about it. The pipe wouldn't just suddenly fail. if you check it often that should be O.K. As far as the power venter, that is a wise concern, but I don't know how robust they are made.

Steve_35

Insulate the flue pipe

I'd use unfaced fiberglass. Wrap the pipe the whole length that's in an unheated area.