Sup burgers.
I found this old petrol stove, its bulky, heavy, bit of a hussle to start (like all petrol stoves, I guess) but it seems kinda powerfull, managed to boil big stove of water (2, 3 liters?) In 10 minutes (outside temperature - 14C) which is pretty impresive I think.

One experienced guy wrote it gives out 3kW of energy, and that it's a lot (agwin, not an expert).

For more pics/vids google
>kuchenka trzmiel 4