Freddy wrote:Yup, the joints are screwed and sealed with high temp silicone. It's odd, I thought his chimney would suck the eyeballs from passing frogs, but it sure seems he's going to need a draft inducer. Part of installation was to visually check the chimney, it's clean & clear.
The lack of draft suggests that the chimney has an opening somewhere that is allowing air to infiltrate.
1. In your original post you mentioned that the cleanout door had been blown open--is it now properly closed and sealed?
2. Is the chimney liner completely intact with no breaks or unsealed liner joints?
3. Is stove pipe to chimney connection fully sealed?
4. Are there any other openings in the chimney such as a second appliance?
Annother possiblility is that there is a lack of make up air available to the boiler. Is there an adequate outside air supply?