Mutually convertible boiler between normal type and condensing type

A boiler convertible between a normal type and a condensing type, the boiler comprising:

• a combustion chamber for generating high-temperature combustion heat by burning fuel therein;
• a heat exchange section including a main heat exchanger for absorbing sensible heat from the high-temperature combustion heat and a latent heat exchanger for absorbing remaining heat and latent heat from an exhaust gas outputted from the main heat exchanger, the heat exchange section applying heat to heating water;
• and
• an outer housing formed at an inner portion thereof with a water reservoir for circulating the heating water, wherein coupling holes are formed in the outer housing, a circulation chamber is formed at a lower portion of the outer housing, the combustion chamber is vertically installed in one of the coupling holes, a burner is provided at an upper portion of the combustion chamber so as to generate heat in a downward direction thereof, a lower portion of the combustion chamber is communicated with the circulation chamber, the main heat exchanger is vertically installed in the outer housing adjacent to the combustion chamber, the main heat exchanger is accommodated in one of the coupling holes and a lower portion of the main heat exchanger is communicated with the circulation chamber, the latent heat exchanger is vertically installed in the outer housing adjacent to the main heat exchanger and is accommodated in one of the coupling holes, a lower portion of the latent heat exchanger is shielded from the circulation chamber by means of a partition wall formed in the circulation chamber, a funnel is communicated with the latent heat exchanger through a funnel support so as to discharge an exhaust gas of the latent heat exchanger to an exterior, and a noise absorbing chamber is coupled to an upper portion of the outer housing so as to seal the upper portion of the outer housing while guiding the exhaust gas from the main heat exchanger to the latent heat exchanger, and the partition wall is defined by an outer peripheral portion of the funnel support inserted into the circulation chamber from a lateral portion of the outer housing.