Kashering at 190 degrees | Sheilot

Kashering at 190 degrees

Question

Shalom, is it possible to kasher a kitchen countertop for Pesach using a steam device with 10 bar pressure and a temperature of 190 degrees?

Answer

Shalom u’vracha.

Steam is considered “irui” (pouring) and not “hag'alah” (boiling immersion). 

For a countertop where the concern is that it became forbidden through irui of chametz, irui with steam is effective to kasher it. 

In any case, it is proper to cover the countertop (with aluminum foil, etc.). 

Irui is like hag'alah, for which 100 degrees is sufficient, and not like light libun, which requires 250 degrees. 

Answered 22 March 2026 How answers are reviewed
Answered by
Answers questions at Rav Amram Fried's Beit Horaah
Smicha "Yoreh-Yoreh" (2012), Rav Amram Fried's Beit Horaah
Orach Chaim, Yoreh Deah
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