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Larry Winiaski  10 principles  of combustion, which aims at maximising heat transfer efficiency,  2 Winiaski basic rocket stove design: burning chamber + insulated chimney + heat transfer stovetop rocket stove  or modified as Vortex rocket  , 2 , is now available on market, claimed to use 40% less fuel ,  70% less smoke a nd cooks faster, lasts for 3 or more years. TE 27% Paul Wheaton  Richsoil   Peter van den Berg, aka peterberg's  Batch Box Rocket  , deduced that such rocket stoves are actually based on  venturi effect , ( secondary combustion optional for complete combustion)  Excel Dean Still's commercial  rocket stove  , 浙江惠文美  SSM 32-X , 2 2000BTU/h, or 0.035MJ/Min/L, TE 51.5% Envirofit  rocket, 8500btu/h Rocket Forum   Aprovecho clean burning 2021 Edition   Research on gap of pot skirt for high TE SSM's Jet Flame : References:  rocket stove primer  3 types of natural draft stov...

It's getting trendy, but how good is it? Caloric values of different fuels:  Engineeringtoolbox   Coal is ~ 2 times more efficient than dry wood, propane is 3~ times per weight For smoke, wood has the most, if used simple open air So for such kind of stove above, it's good for warming, rather than for cooking, or boiling water? Many portable or camp "rocket stove" on market are merely stripped down version of household rocket mass heater:  with a J tube(burning chamber + heat riser),  - air intake duct may be skipped - most without secondary combustion - weak or no venturi effect Recommended portable/camping wood stove: Improved stove from bioenergylists , eg, TLUD gasifier , ~4000BTU/h aprovecho on TLUD , low PM2.5 stove   Peko Pe , aka original TLUD, OSTI research on PM2.5 with Concentrator disc , aka champion TLUD Solo stove and similar ones . DIY a la solo stove/ gasifier   MimiMoto  (2016) , forced draft TLUD, aka FD TLUD, wood pellets optimsed...