Exhaust adapter and combustion apparatus having the same

A combustion apparatus comprising:

• a burner;
• and
• an exhaust adapter which is attached to a member having an exhaust port for combustion gas generated by the burner and which is used for connecting a base part of an exhaust pipe with the base part rising vertically,
• wherein the exhaust adapter comprises a pipe connection part for connecting the base part of the exhaust pipe with the base part rising vertically;
• wherein the pipe connection part has an inner tubular wall and an outer tubular wall which rise vertically and are arranged in a concentric manner, a through hole communicating with the exhaust port is formed inside of the inner tubular wall, and an annular concave part with an upper part open and a lower part closed is formed between the inner tubular wall and the outer tubular wall;
• wherein one of at least two types of exhaust pipes with different pipe diameters is capable of being selectively connected as the exhaust pipe when either the through hole or the annular concave part is used;
• and
• wherein at least a part of the inner tubular wall is formed lower than the outer tubular wall, drain generated from the combustion gas flows over the inner tubular wall and flows into the through hole and the exhaust port when drain flows into the annular concave part and the level of liquid increases, whereby drain is prevented from flowing over the outer tubular wall and from flowing outside.