Heat exchange device and heat source machine

A heat exchange device which is capable of recovering sensible heat and latent heat of a combustion gas, comprising:

• a primary heat exchanger which recovers the sensible heat of the combustion gas;
• and
• a secondary heat exchanger which is disposed to overlap the primary heat exchanger in a vertical direction in a state in which the heat exchange device is installed and which recovers the latent heat of the combustion gas,
• wherein the secondary heat exchanger comprises a plurality of first pipes, and a plurality of second pipes each alternately adjacent to each of the plurality of first pipes in a direction intersecting the vertical direction,
• each of the plurality of first pipes and the plurality of second pipes has a plurality of linear portions and a plurality of curved portions connecting the plurality of linear portions with each other and extends in a zigzag manner in the vertical direction by the plurality of linear portions being connected to the plurality of curved portions in series, and
• each of the plurality of linear portions of each of the plurality of second pipes is disposed to be displaced from each of the plurality of linear portions of each of the plurality of first pipes in the vertical direction.