Heat exchanger for condensing gas boiler

A heat exchanger comprising:

• heat exchange units 1100, 1200, and 1300 configured to exchange heat between combustion gas generated at a burner 70 burning a mixture and first and second heating media, and in which a heating medium flow channel and a combustion gas flow channel are alternately formed to be adjacent to each other in each of spaces between a plurality of plates 110, 120, 210, 220, 310, and 320, wherein the first and second heating media flow through the heating medium flow channel, and the combustion gas flows through the combustion gas flow channel;
• and
• a combustion gas discharge unit 700 configured to discharge the combustion gas that passed the heat exchange units 1100, 1200, and 1300,
• wherein the heating medium flow channel includes a first heating medium latent heat flow channel through which the first heating media flows, a first heating medium sensible heat flow channel which is communicated with the first heating medium latent heat flow channel and a second heating medium flow channel through which the second heating media flows,
• wherein the heat exchange units 1100, 1200, and 1300 are configured with a first heat exchange unit 1100 including the first heating medium sensible heat flow channel that is formed between a pair of plates facing each other of the plurality of plates 110, 120, 210, 220, 310, and 320 so as to absorb sensible heat of the combustion gas to heat the first heating medium, a second heat exchange unit 1200 including the first heating medium latent heat flow channel that is formed between the pair of plates so as to absorb latent heat of the combustion gas to heat the first heating medium, and a third heat exchange unit 1300 including the second heating medium flow channel that is formed between the pair of plates so as to absorb the latent heat of the combustion gas to heat the second heating medium, and
• wherein the first to third heat exchange units 1100, 1200, and 1300 are integrally formed by the pair of plates.