| 摘要 |
PURPOSE:To make an instantaneous agitating and mixing of water and hot water, promote a stable temperature sensing and at the same time a generation of dew water is prevented by a method wherein when water is fed to an upper water collection header, the fed water is circulated in the header and a hot water temperature sensor is arranged at a side opposite to the circulating direction of water. CONSTITUTION:A water feeding pipe 6 is arranged at an upper header 3 having a relative low temperature at a burner fixing part. Water feeding from the water feeding pipe 6 is circulated and fed as indicated by an arrow C by a circulation pipe 9 in respect to the circumferential direction of the upper header 3. The fed water is mixed with hot water instantaneously and then a stable hot water temperature can be detected by a temperature sensor 10 arranged at the opposite side of the opening of the circulation pipe 9. Amount of the water direction toward each of the vertical pipes 4 become uniform, so that a natural convection flow is generated in the vertical pipe 4 and thus no dew water is generated. |
