Is it permitted to cover a vessel of hot tea or similar drink with a cloth (mafteches/towel) on Shabbat to keep it warm?
Synopsis
The Aruch HaShulchan warns that covering a tea or similar hot vessel with a cloth on Shabbat constitutes prohibited hatmanah b'davar she'eino mosif hevel. The Mishnah Berurah similarly warns against this.
More in Insulating with Heat-Generating Materials
Is it permitted on Erev Shabbat (while still daytime) to place a vessel containing cold food on top of a warm pot?
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If the warm lower pot is still sitting on an open fire, does placing a cold vessel on top of it on Erev Shabbat remain permitted?
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Is it permitted on Shabbat itself to place a cold vessel on top of a warm pot (not on fire) to warm it, particularly when the pot is covered with cloth?
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Is it permitted to submerge a vessel with cold liquid inside a vessel of hot water on Shabbat to warm it (a practice common in winter)?
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What is the reason the warm pot is not considered a 'heat-adding insulator' (davar hamosif hevel), and does this reasoning have any limits?
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