Why no on/off button on those electric river boilers?

I'm talking going on for those countertop appliances from Asia. They're such a waste of electricity when not human being used because there's no on/off button on them.

Answers:    Like a tea urn you mean?
they own to maintain a giant temperature round-the-clock or in attendance is a real risk that they could become a breeding ground for Legionnaire's disease.
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