Flue damper

Paul_28

I have the Buderus G124X/25 boiler installed and connected to a stainless steel chimney liner which is insulated. In the morning the flue pipe is cold to the touch and when the boiler fires there is spillage form the boiler hood. It takes a few boiler cycles for the flue to become warm enough for a good draft I thought I would remove the flue damper and replace it with strait pipe to keep the chimney warmer. Do you think it will help?

Steamhead

Are you sure

something isn't partially blocking the liner? Bird or wasp nests can do that......

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Paul_28

The liner

is clear. its a new install. When the flue pipe warms up the daft is good for the rest of the day. It only happens in the morning when the boiler is of for most of the night. The outside tempuature here is about 50*.

Dale

Connector rise?

Is the pipe up from the vent damper as straight and long as possible before it goes into the chimney? A longer connector rise really makes a difference. Is the vent connector B vent double wall or single wall, double wall heats much quicker. Is there a listed cap on the chimney liner? It is not unusual for a flue to spill for a short time but since it's only 50 out it shouldn't spill for long.

Paul_28

Problem solved

Problem solved. There was a small amount of cold air from somewhere in the old chimney blowing on the connector pipe in the chimney thimble. I corrected this by putting ceramic insulation around the connector pipe. The chimney thimble is 7” and the connector pipe 5”. No more spillage and the flue pipe are warm. Thanks

Dale

Good job

This is a good reason to be sure the annular space between the top of the liner and top of the chimney is well sealed, and as you found the bottom also.