Abstract: Provided is a combustion apparatus capable of preventing a heat loss from a combustion cabinet without deteriorating a combustion performance thereof. According to the present invention, a part of an inner side surface of a combustion cabinet (1), which encloses a combustion chamber where a mixture gas erupted from a combustion plate (22) is combusted, is covered with a cover (7) made of an insulation material; and the cover (7) is provided with a concave portion (7a) at an outer side surface thereof having contact with the inner side surface of the combustion cabinet (1), and an insulation air layer (7b) is defined by the concave portion (7a).

Abstract: In a combustion apparatus in which an air supply chamber 4 in a lower part partitioned by a partition plate 3 from an arrangement section of a burner unit and a primary air chamber in a front part that stands from a front end of the air supply chamber are provided in a combustion housing 1 incorporating the burner unit 2, the air from a combustion fan 6 connected to an air supply port 4a opened on a bottom surface of the air supply chamber flows to the primary air chamber through the air supply chamber, and primary air is supplied from the primary air chamber to respective burners of the burner unit, it is an object of the present invention to make it possible to uniformalize a pressure distribution in the primary air chamber and supply the primary air to all the burners equally.

Abstract: In an all primary combustion burner, a partition plate that demarcates a mixing chamber between the partition plate and a bottom wall section of a burner main body and a distributing plate that sections a space between the partition plate and the combustion plate into a first distributing chamber and a second distributing chamber are provided in the burner main body to cause a fuel gas and a primary air to flow into the mixing chamber. A pressure loss is minimized to make it possible to satisfactorily mix the fuel gas and the primary air. An outlet is formed on a downstream side of the partition plate. A guide plate section that extends to the downstream side while inclining in a normal direction, which approaches the bottom wall section of the burner main body, from an edge on the upstream side of the outlet, is provided in the partition plate.