Hatmana (insulation) on Shabbat
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Question
A. Is it permitted on Shabbat to fill water from the urn into a thermos in order to preserve the heat?
B. Is it permitted to place dry food inside a pot on top of the urn on Shabbat, when the purpose of placing it in the pot is so that it will heat up more quickly? And what is the law when one puts it into a roasting bag or wraps it in aluminum foil and places it on top of the urn with the intention of preserving the heat?
B. Is it permitted to place dry food inside a pot on top of the urn on Shabbat, when the purpose of placing it in the pot is so that it will heat up more quickly? And what is the law when one puts it into a roasting bag or wraps it in aluminum foil and places it on top of the urn with the intention of preserving the heat?
Answer
Shalom u’vracha
A. It is permitted. This is considered one vessel and is not hatmana (the prohibition of insulating).
B. Inside a pot placed on the urn it is permitted; this is not hatmana but merely a vessel in which the food is placed.
Wrapping in paper or aluminum foil, when his intention is that it should retain the heat, is prohibited. But if his intention is that it should not crumble or not become dirty, it is permitted.
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