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No, you should not leave a heat pad on for hermit crabs all the time. While hermit crabs do need a heat source to regulate their body temperature, it is important to provide a temperature gradient within the enclosure so that the crabs can choose the temperature that they are most comfortable with. Leaving the heat pad on all the time can lead to the enclosure becoming too hot and can stress the crabs.
It is generally recommended to provide a heat source during the day, such as a heat lamp or heat pad placed on one side of the enclosure, and turn it off at night to allow the temperature to drop and provide the crabs with a cooler area to retreat to.