Abstract: A pot-type burner comprises an open burner having a pot formed by a cylindrical wall defining a column with a bottom wall and an open top, a means for supplying liquid fuel to the vicinity of the bottom wall within the pot, and a first column barrier for restricting the flow of vapor derived from the liquid fuel. The first barrier is spaced axially from the bottom wall in order to form a first chamber with a restricted throat, a second column barrier is spaced axially within the pot, from the first barrier, the second barrier comprising a catalyzer plate extending in a plane normal to the axis of the pot, the catalyzer plate having a central opening, radially extending, spaced apart fins and an annular portion near the first wall of the pot but spaced therefrom to define an annular opening with the first wall.