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Weil McLain WTGO-3 Flue Question

VinVin Posts: 4Member
I have a Weil McLain WTGO-3 in the basement. It is back vented into a standard clay chimney.

My issue...the chimney has been removed because it was falling apart.

I am thinking of installing the new chimney internal. The boiler flue comes out 7 inch. The manual calls for 6 inch round. Weil Mclain support said I can reduce down to 6 inch at the boiler

To install internally, I would need to run a 6 inch flue approx 4 ft vertical before turning up (there is a window on the floor above.) The stack will be about 17 ft in total. 

The stack will be trplie wall flue and framed in. you see any issue reducing this boiler flue to 6 inch?

PS...I also have the option to install the flue outside, where the old chimney was and frame in. I am considering installing indoors to improve the appearance of the house.


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