| 摘要 |
PURPOSE:To prevent noise and vibration as well as to prevent a failure in circulation, by disposing the discharge port of a forced circulation pipe at the connecting part of a forward pipe on the side of a bath boiler in the manner of a double-wall structure. CONSTITUTION:The discharge port 6a of a forced circulation pipe 6 is disposed at the connected part of a forward pipe 5 which is connected to a water chamber 8 in the manner of a double-wall structure. When a bath boiler 4 is heated, the water in the bath boiler 4 is heated and is fed into a bathtub 1 through are forward pipe 5. Hot water is fed back into the bath boiler 4 from the bathtub 1, passing through a return pipe 3. When a pump 7 is driven, part of hot water in the return pipe 3 is discharged from the discharge port 6a, passing through the forced circulation pipe 6. At that time a discharge flow does not cause a back flow by being collided against the staged part 5a because the discharge port 6a is not in a position close to the step 5a. The hot water in the bath boiler 4 can be easily induced because the discharge port 6a is provided at the position where the connecting part of a forward pipe 5 connected to the water chamber 8 is located. Accordingly the circulating effect of a spontaneous circulating passage which passes through the bath boiler 4 can be enhanced.
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