I had to add a tall chimney to my boiler for the smoke to clear our house (or my wife was going to kill me and put me in the boiler, or make a BBQ); boiler about 100 ft away but in the woods.
I saw a picture that someone on this forum added 4x 4ft double wall pieces. Well, in 2013 I did the same. Added 4x 4ft double wall stacks, with guy wire anchors into the concrete pad.
I just wanted to update all of you, because some pople were concerned that the boiler may over heat from the extra draft.
So, I change my seal every year, and I had zero problems. I mean my boiler works perfect. I put a clean out T at the bottom of the chimney, but I don't even need to sweep it more than 1x a year if even. I burn 60% coal, 40% wood, may be that helps.
Anyway, thanks for everyone's help and input.
No smoke, happy wife...
Actually, the extra draft is nice when I open the door. All the smoke just disappears.