Something else HJ

I am fascinated, no , I am OBSESSED with letting no atom of substance, or photon of energy, escape unused. What I mean is to have maximum efficiency possible. So, the caldera and few other designs ( like the Swiss Ranger stove) offer what I absolutely love in a stove which is a built-in windscreen to comletely surround the pot (almost hide it from view) and guide the heat to engulf the pot from all sides, not just the bottom. Even the escaping hot emissions, keep touching the pot to the last moment.

This is the same reason that I absolutely loved the rocket stove made of mud in some 3rd world countries ( seen in u-tubes) .

So, HJ, do you know more of such designs that minimizes escaping heat and focusing & condensing the heat around the pot ???