Question:
Sous vide needs טבילה
Answer:
The sous vide immerser does not need tevilah, because it does not come in contact with food, and it is meant to merely be a heating element.
Sources:
R’ Y. Belski zt”l, and numerous contemporary poskim, including R’ S. Felder, R’ Forchheimer, R’ Y. Cahen shlit”a.
