Combustion apparatus

A combustion apparatus comprising:

• a burner made up of:
• a burner body which is supplied inside thereof with air-fuel mixture, and a combustion plate which covers an open surface of the burner body and which has an air-fuel mixture ejection part;
• a combustion box which has, on a perimeter of one end, a combustion box flange part, adapted to be connected to a body flange part enclosing an open surface of the burner body, and which contains therein a heat exchanger, the combustion apparatus further comprising;
• a combustion plate flange part disposed on a perimeter of the combustion plate in a manner to project outward beyond an inner rim of the body flange part and beyond an inner rim of the combustion box flange part, and also in a manner that an outer rim of the combustion plate flange part is positioned inside an outer rim of the body flange part and inside an outer rim of the combustion box flange part;
• a packing having a portion interposed between the combustion plate flange part and the body flange part, and a portion interposed between the combustion box flange part and the body flange part outside the outer rim of the combustion plate flange part, such that the combustion box flange part is connected, with the packing being sandwiched therein, to the body flange part;
• wherein the outer rim of the combustion box flange part is provided with an outside projection which is bent for erection toward the body flange part so as to face an outer rim of the packing, and
• wherein the combustion plate is provided with an inside projection which is bent for erection toward the body flange part so as to face an inner rim of the packing such that, in a state in which the combustion box flange part is connected to the body flange part, the outside projection and the inside projection are in contact with the body flange part.