| 摘要 |
The present invention provides a liquid heating apparatus which can obtain a sufficient heat efficiency by making large a heating surface area by a combustion gas flowing through an exhaust pipe located in a liquid bath.In a liquid heating apparatus which includes: a liquid bath; a combustion chamber which is provided with a burner, and is formed at one side on a lower portion of the liquid bath; and an exhaust pipe which is located in a substantially horizontal state at an intermediate portion of the liquid bath, and extends from one side of the liquid bath toward the other side thereof, and which heats a liquid in the liquid bath bypassing a combustion gas generated in the combustion chamber into the exhaust pipe, a fin is integrally located on an inner surface of the exhaust pipe along a longitudinal direction thereof. The fin has a heating surface area which is set in accordance with a temperature gradient in a longitudinal direction of the exhaust pipe, and is located on only upper portion side on an inner surface of the exhaust pipe.
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