What is the actual temperature of Yad Soledes?
Answer
As with everything, there are many different opinions. This is probably in large part because the Talmud (Shabbat 40A) doesn't give a temperature, but rather says that Yad Soledet Bo is "hot enough to scald a baby's stomach".
Here are some of the temperatures given:
From here, based on Shabbos KeHalachah by Rabbi Y. Farkash:
Most Poskim agree that Yad Soledes Bo is between 40 and 45 degrees Celsius (104-113 Fahrenheit), or approximately 110 degrees Fahrenheit. (Shabbos KeHalachah, p. 24.)
There are (at least) 15 opinions from various Poskim brought here, each one with sources (which I didn't look up). I'll quote the ones that have numbers:
Chelkas Yakov (YD 44:3): If water gets between 50 and 70 degrees (Celsius), this is Yad Soledes Bo -- (between 122 and 158 Fahrenheit).
Igros Moshe
(OC 4:74): It is proper to be stringent to be concerned lest 43 degrees is Yad Soledes Bo. There is a Safek until 71 degrees. That is surely Yad Soledes Bo, even to be lenient. -- (43C == 109F and 71C == 160F)
(YD 2:52): Yad Soledes Bo is about 79 degrees, to be stringent. (79C == 174F)
(YD 3:31): Surely, 74 degrees is Yad Soledes Bo. (74C == 165F)
Minchas Yitzchak (7:61): Sixty degrees is surely Yad Soledes Bo. (60C == 140F)
Minchas Shlomo: I say that there is no concern less than 45 degrees. (45C == 113F)
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