To provide a hot water supplier for outdoors capable of preventing dew condensation in an exhaust tube.

The exhaust tube 3 has a double structure comprising a cylindrically formed outer tube 6 and an inner tube 7 being a cylinder with a smaller diameter than the outer tube 6, fit in the outer tube 6. Protruding bars 8 protruding outward from an outer face are integrally provided around a front part and a rear part of the inner tube 7. The inner tube 7 is fit in the outer tube 6 with tips of the protruding bars 8, 8 abutting on an inner face of the outer tube 6. In between the front side protruding bar 8 and the rear side protruding bar 8, an air layer 9 is formed between the outer tube 6 and the inner tube 7, and the air layer 9 is provided with a function as a heat insulating material.

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