Urn (Kashering) Status: If an electric hot water urn remains on the counter during the year, it must be kashered in order to use it on Pesach. This is because during the year someone might have warmed up a challah on it or poured water directly from the urn into an oatmeal or instant noodle soup. Even if no one remembers doing this, one must be concerned that it may have happened at some point. *** Rav Schwartz ruled that if it is the type of urn which is not brought to the table, is not washed with chametz items, and the family is 100% sure that they (and their children and guests) never used it for anything but heating hot water, and there was no inadvertent hot chametz contact (e.g., being accidentally splashed with chametz), it may be used for Pesach without kashering. Most homes are not disciplined enough to reach this level of confidence, and should therefore kasher the urn. To kasher: The lid should be kashered with hagalah. The urn itself should not be used for 24 hours prior to kashering. Then it should be filled almost to the top with water and turned on. When the water reaches the highest temperature, while still plugged in, boiling water should be added to the urn until it overflows.