Gas condensing boiler chimney end (Chaffoteaux)
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The chimney end/exhaust of the current gas condensing boiler was destroyed so I built one ...
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The end piece of the chimney on my current gas condensing boiler broke (it became brittle), and I couldn’t find a replacement part sold separately - only the entire chimney with the attached end piece.
To solve this, I created this end piece, which I’m already using.
I printed it using PETG. While ABS might have been a better material choice, I want to test how long PETG will last. No supports were needed during printing, and the result came out fine.
Details for those interested:
This end piece is for a pipe-in-pipe chimney.
The outer pipe (air intake) has a diameter of 100mm, and the inner pipe (exhaust gases) has a diameter of 60mm.
To prevent condensation from entering the air intake pipe, I sealed the inner PETG pipe with silicone.
Currently, I’m using it with an almost 16-year-old Chaffoteaux boiler, but it could likely work with other boiler models as well.
I used orange PETG simply because that’s the material I had on hand. :)
Update 14/09/2026: The model is still in use, with no sign of damage because of sun or adverse weather, so is in place for 3 years, 7 months, 4 weeks, 1 day or 1329 days :)