I have two Ashford 30.1’s. One is on a 15’ chimney, and the other on close to 30’ of chimney. Both work fine. In theory, the tall one should allow me to dial lower at warm outside temps, but since I avoid running the short stack on warmer days (it’s in a part of the house with lower heating load, so I don’t need it), I don’t have any issues with it.
I’d say that if you can get more than 18 feet of pipe, I’d not worry much about the exact height.
Thank you.
From stovetop to the cap it will be around 22'
I should be golden then!!