I have put about 3 or so cords of mixed oak, maple, birch, cherry, pine and poplar through a new tarm solo plus 40 this year. It pretty much always seems to have good gasification and runs hot. Between 375-475 in the smoke box, but when the draft fan is on and its buring there still seems to be a good amount of smoke coming out of the chimney. I have an exterior chimney and from the boiler to the top of the flu is roughly 35 feet or so. I was just curious if I should be concerned with any creosote build up in the chimney, the smoke worries me a little bit so I was wondering if anyone has checked the flue with a gassifier like mine. Any comments would be great so I can go back to sleeping worry free at night again. My roof is so high and steep that I will need to find someone with a 36-40 foot extension ladder to go up and look down the chimney. I was told with this gassifier that I should never have to worry about creosote, but also was told there wouldnt be much smoke either.