Log size???

https://www.hearth.com/econtent/index.php/forums/viewthread/30239/

Above is a thread recently discussing this very topic. (Full of comedy as well) In general small quartered pieces work really well. Nothing bigger than say 4-6" diameter. No need to leave an air space. Bigger logs won't burn as hot and may not gasify well. However, throwing a big one on top of the night load may allow you to still have a bed of coals in the morning. Enjoy the Tarm, these are amazing appliances. I am still addicted even after years of using mine! (actually more addicted than ever thanks to this forum!)

In general small quartered pieces [4-6] work really well.

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This is good advice for most of use who need to split our wood. I think the ideal, if there is one, is round wood +/- 2-5" in diameter. The reason for this is that split or quartered pieces, with their angular sides, can pack to the extent that they can hang up a bit and lend themselves to bridging. When using splits, I usually do not pack too tightly. Round wood is less likely to hang up.

Access to small round wood is not too good and it's a lot of work to put up cords of small stuff. But if you have willow, small poplar/aspen, buckthorn, pine thinnings, etc., you might want to put some up to get it well seasoned and give it a try.

kiel said:

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!!

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Makes a difference whether you're looking for efficiency on long burn time - two different goals. The thread mentioned above covers it pretty well.