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A heating boiler having a vertical, completely premixing burner tube arranged in a space shut off at the top includes concentrically relative to the burner tube a helical water tube surrounded by an upwardly extending flue gas discharge jacket. The burner tube comprises a lower circumferentially clo

A heating boiler having a vertical, completely premixing burner tube arranged in a space shut off at the top includes concentrically relative to the burner tube a helical water tube surrounded by an upwardly extending flue gas discharge jacket. The burner tube comprises a lower circumferentially closed tubular mixing portion and an upper portion having burner ports formed by a plurality of stacked alternately flat and radially corrugated annular discs held together by a flat top plate connected through a bolt or the like to a cross piece or the like wedged in an internally tapered upper end of the circumferentially closed tubular mixing portion.

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A heating boiler having a vertical axis and including, arranged concentrically with said axis, a completely premixing gas burner tube having a lower circumferentially closed premixing portion, with an upper end and a lower end, and an upper portion provided with a plurality of burner ports extending

A heating boiler having a vertical axis and including, arranged concentrically with said axis, a completely premixing gas burner tube having a lower circumferentially closed premixing portion, with an upper end and a lower end, and an upper portion provided with a plurality of burner ports extending through the tube wall with inlets on the inside circumferential surface of the tube and outlets on the outside circumferential surface of the tube, the outside circumferential surface serving as a flame supporting surface; means for delivering a mixture of gaseous fuel and sufficient combustion air to burn the fuel completely to the lower portion of the burner tube; a helical water tube surrounding the burner tube; an enclosure surrounding the water tube and having a closed upper end; a flue gas discharge jacket surrounding and radially spaced from the enclosure; an annular bottom closure member mounted underneath the helical water tube and sealingly connected to both the flue gas discharge jacket and the lower portion of the burner tube; and means for guiding combusted fuel and air from the burner ports to the space between the enclosure and the flue gas discharge jacket, wherein the improvement comprises: the lower circumferentially closed premixing portion having a length and a diameter such that complete premixing of fuel and combustion air is assured; the upper portion of the burner tube being an assembly of stacked alternately flat and radially corrugated annular discs forming said plurality of burner ports such that the inlet areas of said ports are smaller than the outlet areas, the discs having substantially equal inner and outer diameters, and the upper portion of the burner tube further including means for holding the stacked discs together and for attaching the stacked discs to the lower portion of the burner tube; the annular bottom closure member comprising a condensate trough having a drain outlet; a fuel nozzle mounted below said annular bottom closure member; the connection between the annular bottom closure member and the lower portion of the burner tube comprising an upwardly extending passage coaxial with the vertical axis and tapering inwardly toward the lower end of the lower portion of the burner tube; and the interior surface of the burner tube tapers inwardly toward the upper end of the lower portion, and wherein the means for holding the stacked disc together comprises a flat plate placed on top of the stack of discs, a cross piece disposed in the tapered region of the lower portion of the burner tube, the cross piece having angles ends which matingly fit against the tapered interior surface of the burner tube, and a tension bolt connecting the flat plate to the cross piece.