| 摘要 |
An aquarium water heater includes a hollow heat-conducting internal tube with an electric resistance heater element and electrical connections disposed adjacent an outer surface of the hollow heat-conducting internal tube, a temperature thermal cut-out switch electrically connected to the heater element for overheat protection, and a heat-conducting, electrically insulating polymeric filler spaced between the internal tube and an external tube that circumscribes the internal tube and the heater element. The aquarium water heater also includes a water temperature sensor that senses the temperature of water into which the heater is at least partially immersible, electrically coupled to a controller to activate and deactivate the heater element and to an indicator that indicates a condition that corresponds to the water temperature being in between a first predetermined minimum temperature and a first predetermined maximum temperature and a different indicating pattern corresponding to the water temperature dropping below a second predetermined minimum temperature or exceeding a second predetermined maximum temperature.
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