When the temperature reaches 100 degrees Celsius, the power supply will be cut off automatically.
That is, the red light on the plug connected to the thermos goes out.
If you leave him alone for one night
When the temperature reaches 100 degrees, he will stop heating.
When the temperature drops to about 60 degrees
There is reheating
If your electric hot water bottle is not a fake product.
The consequence of plugging it for one night is power consumption and the service life of hot water bottle is reduced.
I hope my answer can help you.
O(∩_∩)O