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...