ok i am now REALLY impressed with this stove.
i left it at 1.75 on the dial from 5:00 pm last night till 5:00 am held 350 * all night with 2" blues the whole time. when i looked in the hopper it had gone down 2" from the lip and after a shake to get a glow under the whole grate area 3". now if i calculated the area to find the weight i'm sure it wouldn't be much.
as an experiment in "how low can you go" at the time i tended the stove i turn the regulator back to 1.5 and left for work. since i have time to run around some i went back to look at it at 10:00. stove top temp. 275 *, blues still active though down to 1 " tall, house still stable at 71*.
rberg, i can get both the pics and measurements. this is a very simple and effective feature,i'd be surprised if they aren't all coming this way now.