Heating with Boiling Water on Shabbat
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Question
Hello Rabbi, is it permissible on Shabbat to heat a vessel containing dry food by placing it in a pot with boiling water that was heated before Shabbat (from a boiler)?
Answer
Hello Rabbi
It is forbidden to immerse food on Shabbat in a vessel full of hot water, due to the prohibition of insulation. 4
The prohibition of insulation usually applies to hot food, but in something that adds heat, it is forbidden to insulate even a cold item.
Source
Mishnah Berurah, Siman 258, S"K 2
The later authorities write that it is forbidden to take a vessel with a cold drink and immerse it on Shabbat in a vessel full of hot water to heat it inside, even if it will not reach the temperature at which hands recoil, as this is a true method of insulation since it is completely immersed inside.