| 摘要 |
The water heater 14 is configured for operation from a vehicle battery and includes a water tank 22, an electrical heating element and a switch means 26 operable to switch power to the heating element on and off. A low battery circuit is operable to detect when the voltage of the battery is below a first predetermined threshold value. It also prevents the supply of power to the heating element when the voltage is below the threshold. The low battery circuit may provide a visual 38 and/or audible signal when the voltage is below the predetermined threshold. A second predetermined threshold value for the voltage may also be provided in which the circuit permits the supply of power to the heating element following prevention thereof only once the second threshold is reached. |
