Different poskim have different values for yad soledes bo (YSB). I have seen values from as low as 110 degrees F to as high as 160 degrees. Current practice is to use both values l’chumrah. As a side note, I wonder how some poskim came up with their published values for YSB. Clearly, in the times of the Gemora, there was no way to objectively determine objective values for temperatures lower than boiling water. I have always understood that YSB was a temperature which was not simply uncomfortably hot but a temperature at which one’s hand would reflexively recoil. To my mind, the commonly accepted lower limit of 110 does not come close to meeting the the description.
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