Countertops that are made of solid stone, like granite or marble are able to be Kashered for Pesach. Other synthetic or composite materials (including granite composite) can not be Kashered and should be covered.1
Granite or marble countertops can only be koshered using Eruy Roschin, which means pouring boiling water from a pot that has been heated on a fire2. Actual water3 is needed to kasher, not steam4. The concept of using a steam machine is that it will boil water and spray that water through a hose creating a neat and efficient method to accomplish Eruy Roschin. However, if the steamer only produces steam and not actual boiling water, it can not be used to kasher, even if the steam is hotter than 212 f5. STAR-K has tested many models of steamers available commercially and have found that almost all of them will only produce hot steam and not boiling water6.
Another concept that many […]