PURPOSE: A condensing type gas boiler system is provided to reduce the exhausting resistance by forming an exhausting channel of combustion gas in the "U" shape by disposing a burner downward, thereby reducing required capacity of a blower and, accordingly, reducing the whole power consumption together with the vibration and noise. CONSTITUTION: In a condensing type gas boiler system, a burner(3') and a main heat exchanger(2') are mounted in a combustion chamber(1) and a second heat exchanger(4) is mounted in an exhausting channel(5), so that condensation water of the second heat exchanger is discharged below the exhausting channel, wherein the burner is downwardly disposed at an upper part of the combustion chamber and the main heat exchanger is disposed at a lower part of the combustion chamber, such that the exhausting channel of the burner is formed in the "U" shape.
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