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Halacha - Puttig the urn on a Shabbos clock
Submitted by anonymous  Answered by Rav Peretz Moncharsh

When the water cools off it becomes classified as a raw item that can be cooked, when the clock turns the urn back on it is cooking on Shabbos. However, since you have not done any action on Shabbos, it would seem to be no different than setting your lights on a Shabbos clock. While there are opinions that would permit this practice, such as R' Shlomo Zalman Aurbach zatzal, even according to the lenient opinions there are potential pitfalls. For example, while the water is reheating, if one would remove a cup of water from the urn the reduction of volume would cause the remaining water to boil faster and would be assur mi'Deoraisa because of hastening cooking. The Minchas Yitzchok, however, rejects the entire basis of the heter and forbids using a Shabbos clock to cook completely. Furthermore, R' Moshe Feinstein zatzal was opposed in general to the usage of Shabbos clocks, and certainly here where there is only a minor benefit it would be recommended not to rely on the lenient opinions.

posted:2008-06-22 01:57:30

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