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Q. I have an electric urn which I use all year for heating hot water. Do I have to kasher it before I use it for Pesach?
A. Rav Schwartz ZT"L ruled that if it is the type of urn which is not brought to the table, is never used for anything but heating hot water, and is not washed with chametz items, it may be used for Pesach without kashering. If it is small enough to be brought to the table, is used to heat other beverages, you ever warm challah or other food on top of it for Shabbos, or you clean it with vinegar (to remove calcium buildup) or with the chametz dishes, then it should not be used for Pesach without kashering.