Good catch on the fire"pan". I have not studied the thermette site enough to see all the differences. The wire handle on the side looked less than perfect, but the Kelly or Storm bail and chain lifter are strange too.

I burned my splitting stump with the firepan (see photos) but at least the full base allows burning on mineral soil or rock without scarring. The storage feature is also a must in my view.

I like the larger fill hole of the Kelly design also, but this does pose a splash hazard that I learned with mine. I was down blowing through the firepan holes to really accelerate the burn (for photo purposes not really needed) and the spout was pointing in that direction....splashed boiling water on my cheek. Now I point the spout opposite the holes, but mostly blowing is not needed unless you use really green wood or have fed the chimney with too much fuel at once.

I keep the fill to 20 oz (600ml) on mine or the extra boiling water splashes out.

If I get over to Bellevue to look at the thermette I will try and give some feedback here. My guess is that I will get the large Storm from Lehman's or direct from the UK though.

The one pint is not bad for backpacking, more bulky than a cup and little alcohol or esbit stove though. But unlimited fuel is an attractive feature if all you need is hot water.