laskern: I looked up Rabbi Ribiat’s sefer after posting this morning and found what you wrote in Rabbi Ribiat’s sefer (Vol 2 Page 558). He writes: “Although heating liquid to 110 degrees Fahrenheit (43.3 degrees Celsius) is Bishul this does not mean the bishul process was completed in the liquid. Heating the liquid further may still constitute the Melocho of Bishul. To be permitted to heat (or reheat) a liquid, it must have reached a minimum temperature of 160 degrees F / 71.1 degrees C while in a kli rishon.” I know that a poseik in my neighborhood does allow one to heat water on the blech late on erev shabbos as long as it reaches 160 by shkia.
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