| 摘要 |
PROBLEM TO BE SOLVED: To provide a latent heat recovery type evaporative oil water heater which prevents freezing of retained water inside heat receiving tubes without providing a dedicated heater for preventing freezing which heats the heat receiving tubes of a primary heat exchanger and a secondary heat exchanger.SOLUTION: In a latent heat recovery type evaporative oil water heater 1 which includes a burner configured with an evaporating unit 7 which has heaters 4 and 6 for heating and which evaporates a fuel, and a combustion unit 10 which combusts the fuel evaporated at the evaporating unit 7, a primary heat exchanger 23 which recovers sensible heat from a combustion gas generated by combustion of the burner to heat water flowing through a primary heat receiving tube 22, a secondary heat exchanger 25 which recovers latent heat from the combustion gas which has passed through the primary heat exchanger 23 to heat water flowing through a secondary heat receiving tube 24, and a temperature detecting unit 36 which detects a freezing prevention temperature, in which the primary heat exchanger 23 is arranged above the burner, and the secondary heat exchanger 25 are arranged above the primary heat exchanger 23, and when the freezing prevention temperature is detected upon stop of operation of the latent heat recovery type evaporative oil water heater 1, the heaters 4 and 6 for heating are powered on. |
