Open air stove

An open air stove which comprises a fuel supply line, one end of which can be connected to a fuel source and the other end of which includes a vaporisation loop, and which further comprises, at said other end of the fuel supply line, a burner nozzle, which has a nozzle hole defining a nozzle hole diameter φm and which extends into a cylindrical part of an inner cups said inner cup being mounted concentrically in a cylindrical part of an outer cup such that the cylindrical part of said inner cup extends at least partially into the cylindrical part of said outer cup, wherein the cylindrical part of the inner cup defines an inner diameter φi and the cylindrical part of the outer cup defines an inner diameter φy and wherein the stove is adapted for selective use either with gaseous fuel or with liquid fuel by virtue of the relationship among the nozzle hole diameter φm, the inner diameter φi of the cylindrical part of said inner cup, and the inner diameter φy of the cylindrical part of said outer cup being such that φm lies in the range of 0.28-0.37 mm, φi has the value 24 +/−5 mm, and φy has the value 60 +5/−10 mm.