Some Shabbos pump-pots advertise, does not require טבילה. It's based on the premise that some of the parts, a איד has a שותפות and the workers are paid some of their wages by the איד.
Can the Shabbos-Hot plate be used? Some poiskim are not comfortable.
Can the La-Briut self heat meals be heated on shabbos/Yom-tov?