JPS5553655A - Boiler - Google Patents

Abstract

PURPOSE: To provide a boiler capable of heating bath water efficiently, by employing an arrangement in which a flue for discharging combustion gas of burner to the outside is provided on the outside of a chamber formed around the burner wall so that combustion gas is discharged to the outside, flowing down a flue formed between said chamber and another chamber formed on the outside of said flue.

CONSTITUTION: Water in bathtub 2 is introduced into chamber 17 in external box 1 via connecting pipe 18 and then flows through connecting pipe 8 into another chamber 11 formed around the outer periphery of burner chamber, in the manner filling the chamber 11 to its full capacity. On the other hand, when gas or the like is combusted in burner 5, combustion gas rises upward while heating a third inner wall 10 constituting the burner wall and comes into contact with top cover 6, thereby heating water filled in chamber 11 formed on the outside of said third inner wall 10 and water in chamber 17 formed upwardly of the top cover 6. Then, combustion gas flows downward through a flue formed between a first inner wall 3 and a second inner wall 9, so that water in chambers 11, 17 is heated. After heating water, combustion gas is discharged to gas duct 14 via flue 13.

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