Years ago I had exposure to what I know as  a BUZZ Stove via campmore.....same principle------battery operatered forge style stove-the guide used it in the gates of the artic on a 65 day trip-when they return at the end of the summer season I inquiered about the stove and her experiences as I was very curious about her take....on the stove and the trip......she informed me that the stove worked but it was slow and she like gas better-when I asked if she would use one again-she replied yes in a small group/solo------asked the same of one of the groupys I was informed that the thing sucked!......there was no glow in her eye or the groupys for that matter about the stove. Mind you all this was 15 years ago-we were both buzzing about he Buzz-----sorted out a lot of weight issues and fuel issues as they are suppose to burn nearly anything that one can put a flame to.....never tried one and the buzz was the closest that i ever got....Yeah yeah I know not much help! There are others available too......I will be watching this thread as it has rekindled the interest. Sorry I could not resist. Droppings anyone! anyone?

A bit misleading, I think.  THere is no way you can burn fuel twice.  At best, it might be burning incompletely somehow at the bottom, then burning the remainder at the top.

I read somewhere, a long time ago, that "wood" does not actually burn, but rather, the heat gassifies the wood - i.e. it goes from a solid to a gas, then the gas burns.  You can kind of see that when a stream of gas shoots out of a burning log.

even gasoline liquid does not burn, it is the vapor that burns

 I'm going to get some kind of wood burning stove before my next spring trip, whenever that is
 I'll bring my trusty Peak 1 multi-fuel for a quick start in the morning, and use the Wood-Burner for the evening meal, and starting the campfire. I figure the trade-off from bringing less Coleman fuel and the weight of the Wood-Burner, will be about even.
 Another thing I'm looking at, is that with my dry-fly tarp/tent set-up, that little Wood-Burner would allow me to use it as a miniature heating stove, if I rig some kind of spark arrestor for it.
 I'm hoping someone that has either the Zip Stove or Wood Gas stove will way in on the differences IF there is any?
 Worse case scenario, I'll order BOTH and send one back.
 PS, Mad Mat is dead on about the liquid gasoline comment!
When I was a young buck , I worked with my Dad, we installed gas tanks/pumps and hoists in Service stations. Some was new work, most were additions, so we were around gasoline and vapors. My Dad showed me the real danger with a little "FARMER" experiment. He filled a metal bucket with gasoline, and proceeded to light a match, blow it out and threw it in the bucket
Too my amazement, the match went out! He then emptied the bucket into a bulk tank, and repeated the experiment. The bang and flash from the fumes scared the hell out of me, and made me realize what was the real danger was when working around or with gasoline

Mister_Bubble,

I get the idea behind the wood gas stove, I'm just curious as too whether the Wood-gas stove I referenced is DIFFERENT than the Sierra Zip stove, or are they BOTH using the same principle?
They both have the blower, and the Wood Gas stove has an illustration of how it works. The Sierra Stove doesn't, but the explanation "sounds" the same?
 IF the Wood gas stove could cut down on the pot sooting, that would be a big plus as far as I'm concerned.
 Maybe the only difference is the NAME :question

I looked at the zz website - with the double walls with ports up near the rim, it looks like the zip is probably a secondary-combustion capable stove.

I don't know how much air flow you really need to get the good secondary combustion going - I'm guessing it isn't all that much, because you can do it without a forced draft.