Abstract: A gas boiler having a boiler unit constructed by interconnected boiler sections each having an internal waterway bounded by one or more heat transfer surfaces. Baffles on the boiler sections define serpentine flue passages, and the baffles include bypass openings formed by notches and/or slits to suppress standing waves and associated noise. A burner includes a conical burner element having burner ports arranged in clusters to enhance the flame distribution and stability. A distributor cone nested within the burner element provides a pressure drop for noise suppression. The blower shaft is equipped with a magnetic plastic washer which effects a seal against air infiltration while allowing the blower shaft to shift from side to side.

Abstract: A gas boiler having a boiler unit constructed by interconnected boiler sections each having an internal waterway bounded by one or more heat transfer surfaces. Baffles on the boiler sections define serpentine flue passages, and the baffles include bypass openings formed by notches and/or slits to suppress standing waves and associated noise. A burner includes a conical burner element having burner ports arranged in clusters to enhance the flame distribution and stability. A distributor cone nested within the burner element provides a pressure drop for noise suppression. The blower shaft is equipped with a magnetic plastic washer which effects a seal against air infiltration while allowing the blower shaft to shift from side to side.

Abstract: A side wall termination unit for a gas boiler which terminates side by side vent and air supply pipes extending through a building side wall. The pipes extend through inside and outside plates on the internal and external wall surfaces. A one piece termination cap is mounted on the outside plate and includes a sleeve which holds the vent pipe in alignment with a vent opening in the cap. The intake end of the air supply pipe is butted against stops to keep it exposed. Extending around the sleeve and stops is a wall formed by spaced apart fingers which present between them air intake openings for allowing outside air to enter the intake pipe. A peripheral flange on the termination cap is spaced outwardly from the building wall to provide an air intake slot.