| 摘要 |
A dual function water heater having two separate hot water outlets, one for potable water and the other for a building heating system. The vertical flue pipe, extending through the tank, comprises a radially expanded means for increasing water heater power productivity and efficiency of heat recovery from the flue gases. The radially expanded means comprises a chamber for the flow of the hot flue gases, and the chamber includes a means for directing the hot flue gases toward the inner surface of the radially expanded means. In a further improvement, the burner control unit possesses an additional means for adjusting burner power depending on water temperature in the water tank. In a still further improvement, the means for directing the flue gases constitutes a tank containing water in a heat exchange relationship with water in the tank.
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