Heat exchange device and heat source machine

A heat exchange device, capable of recovering a sensible heat and a latent heat of a combustion gas supplied from a burner, the heat exchange device comprising:

• a primary heat exchanger for recovering the sensible heat of the combustion gas;
• a secondary heat exchanger disposed on a side opposite to the burner with respect to the primary heat exchanger for recovering the latent heat of the combustion gas;
• and
• a connecting pipe connecting the primary heat exchanger and the secondary heat exchanger,
• wherein the primary heat exchanger comprises a primary heat exchange part, a shell plate surrounding a periphery of the primary heat exchange part, and a body pipe part for cooling the shell plate,
• the body pipe part is disposed closer to the burner than the primary heat exchange part and is connected to the connecting pipe, and
• the primary heat exchange part comprises a first heat transfer tube part that is connected to the body pipe part, and a second heat transfer tube part that is connected to the first heat transfer tube part and is disposed on a side opposite to the body pipe part with respect to the first heat transfer tube part,
• wherein the body pipe part extends horizontally along a periphery of the shell plate and is disposed along inner surfaces including a pair of side surfaces and a back surface of the shell plate,
• wherein the first heat transfer tube part is disposed above the second heat transfer tube part in an up-down direction,
• wherein the first heat transfer tube part is located between the body pipe part and the second heat transfer tube part in the up-down direction, and the second heat transfer tube part is located between the first heat transfer tube part and the secondary heat exchanger in the up-down direction.