Glass Stovetops

40. Electric stovetops made of glass cannot be kashered because they need libun. Turning on the burners to the highest setting does not help for the rest of the surface. Libun cannot be done with fire, as that would ruin the unit. [Some say that the Mechaber, who holds that glass does not absorb (שו"ע סי' תנא סכ"ו ), would agree that glass used over fire, such as these stovetops, does absorb (שו"ת טוב טעם ודעת מהדו"ג ח"ב סי' כה, שו"ת מהר"ם שי"ק יו"ד סי' קמא ).]