I just installed a tarm solo plus 40 and have had it running since the first of december. I'm just curious as to what diameters of logs people seem to have the best luck with. Not sure if it pays to have a smaller diameter and be able to pack in the firebox more fully; or if then it would burn to quickly. Vise versa if you use bigger logs, you have more air space; but would it last longer... thanks for any responses!!