Combustion apparatus

A combustion apparatus comprising:

• a mixing unit configured by fuel and combustion air;
• a first catalyst unit configured by catalyst bodies, heat receiving fins, and a first housing formed by double walls having a heat medium passage therebetween;
• a second catalyst unit configured by a second catalyst body and an electric heater for heating;
• and
• a heat recovery unit configured by a second heat receiving section and a second housing formed by double walls having a heat medium passage therebetween,
• characterized in that said mixing unit, said first catalyst unit, said second catalyst unit, and said heat recovery unit are joined in the named order, and the heat medium passage formed in the first housing of said first catalyst unit and the heat medium passage formed in the second housing of said heat recovery unit communicate with each other.

A combustion apparatus comprising:

• a fuel supply section;
• an air blowing section for supplying combustion air;
• a mixing section for mixing said fuel with said combustion air to obtain an air/fuel mixture;
• a plurality of first catalyst bodies which are arranged substantially in parallel with each other to divide the downstream location in the flow direction of said mixture into a plurality of flow paths;
• and
• a first heat receiving section configured by a plurality of heat receiving fins arranged in flow paths divided by said first catalyst bodies and a cooling path penetrating said heat receiving fins,
• wherein an upstream end of one of said heat receiving fins is located on the inside of a further upstream end of one of said first catalyst bodies at least on an upstream side of said cooling path which opposes said one of said heat receiving fins.