Importance

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Abstract

In a heat exchanger, a respective meander passage 3₁, 3₂ in each of two stages connecting heat absorbing tubes 31 divided into the two stages and arranged in a flow direction of a combustion gas in an inside of a casing 1 from one side to the other side in a Y-axis direction is constituted, and a heat absorbing tube 31 of #11 at an upstream end of the meander passage 3₁ in a first stage at an upstream side of the flow direction of the combustion gas and a heat absorbing tube 31 of #21 at a downstream end of the meander passage 3₂ in the second stage at a downstream side of the combustion gas are made to be positioned at the one side in the Y-axis direction, a ventilation resistant portion 221, 222₁, 222₂ for suppressing the combustion gas from being directed to the heat absorbing tube 31 of #21 at the downstream end of the meander passage 3₂ in the second stage is provided.

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First Claim