That is what I always thought Hog. Last year I bought eight packs of ECO Bricks at TSC to play with them. I could burn six at a time, a 21 pound package, and not have any over-fire worries. Two N/S on each side of a three inch tunnel and two sideways on top of it. More than that at a time would need to be packed tighter. Filling up the 30-NC with them would require re-mortgaging the house to pay for the things.
I had anxiety with the BioBricks but found that if you pack them tightly with no air spaces between (as shown in instruction) a stove full of them will not take off. They burn at a controlled rate. I was anxious at doing this with the Castine, but I followed directions and there was no drama throughout the burndown.
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