> many lose site of the fact that much energy is being stored in the vaporizer cup due to the small size of the heater

If one had a larger hunk of metal (a larger "thermal mass") this would help to stabilize and slow the process of heating, and prevent an "overshoot" of temperature.
But, more mass would mean slower cycles between hives, as it would also cool down slower.  There was a vaporizer marketed with a precision thermostat, but no one wanted to pay the extra cost.

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