Heat exchanger for latent heat recovery

A heat exchanger for latent heat recovery, in the trunk part (40) of flowing the burning exhaust accepts: a plurality of snake crawling-shaped heat absorption pipes (41) with a plurality of straight pipe parts (41a) arranged by equal space on the flowing direction (X axis direction) of the burning exhaust and U-shaped bending parts (41b) for connecting the straight pipe parts on the X axis direction together, a plurality of heat absorption pipes are stacked up on the Z axis direction vertical to the X axis, and the heat absorption pipes adjoining on the Z axis direction are arranged displacement on the X axis direction to improve recovery efficiency of the latent heat. The displacement delta P on the X axis direction of the heat absorption pipes adjoining on the Z axis direction is set to out of 1/2 arranged space P value of the straight pipe parts (41a) of the heat absorption pipes (41) on the X axis direction, the broad portion and the narrow potion of the X axis direction space between the straight pipe parts (41a) of one part of heat absorption pipes (41) adjoining on the Z axis direction and the straight pipe parts (41a) of the other part of the heat absorption pipes (41) are arranged alternately on the X axis direction.