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Viessmann condensation issues
Hello all and thanks for your help in advance. I have a Viessmann Vitogas 100 (with Vitotronic 200 controller) at my house in CT. It was installed by the builder 5 years ago.
On certain (colder?) mornings, there is a strong downdraft in the gas flue. The flue vents through a clay-lined vertical chimney. The chimney is approx 35 feet tall and is on an outside wall of the house. It extends above the roofline. The effect of the downdraft is that the flue gases are pushed out from the draft hood, resulting in high humidity, heat and the presence of flue gas odor in the mechanical room. There is also condensation on the outside of the flue piping leading to the the chimney. Presumably this is a result of the high humiditiy level. When this condition is occuring, the flue pipe is cold to the touch.
This issue seems to occur most in the early morning after I have had the heating circuit turned off for a period of time (during the night, to save energy). It seems that the choice is either burn energy all night long or suffer with this flue gas/humidity.
A chimney sweep suggested that the chimney is too clod and the problem could be resolved using a new insulated steel liner dopped down the chimney and connect to the boiler. I also thought that another solution might be a power vent of some sort?
I appreciate any advice you might have on how to deal with the situation. Also, any recommendations on Viessmann qualified contractors in CT.