Crockpot Controversies

When Irving Nachumson filed for a patent in 1936, could he have imagined that his invention would be the center of a major halachic controversy sixty years later? Did it cross his mind that flintstones from medieval France might be used to defend his invention?
Inspired by cholent, Irving Nachumson invented the slow cooker. Upon purchasing his company in 1970, the Rival company rebranded his device as the “Crockpot.”
While the crockpot certainly makes it easy to have hot cholent on Shabbos, it does have its halachic issues. This article will focus on the great controversy that erupted in 1995. Chazal decreed that on Erev Shabbos, one should not insulate hot food in a material that adds heat. They were concerned that if one were to submerge his food item in a heat-producing medium, the following week he may submerge his food in coals. One may certainly not insulate his food before Shabbos in hot coals, because he may come to stoke the coals on Shabbos. Therefore, Chazal forbade hatmana, insulating food in a heat-producing medium before Shabbos.