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kilotesla t1_j0m2cbk wrote

I'm not sure exactly what your question is, but once you have reached boiling, leaving it sitting there boiling does not change the temperature of the water, which is already at 100° C. So all the energy that you are using while you are leaving it sitting there boiling is being wasted, except to the extent that it's useful in heating the house and, if you need added humidity, humidifying it.

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