noun
electric rice cooker; rice cooker and warmer
Refers to an electric appliance that cooks rice and keeps it warm. The term 炊飯器 is also common, but 炊飯ジャー emphasizes the warming function.
新しい炊飯ジャーでご飯を炊いたら、ふっくらしていて美味しかった。
When I cooked rice with the new rice cooker, it came out fluffy and delicious.
炊飯器 is a more general term for a rice cooker, while 炊飯ジャー specifically highlights the warming function (保温).
Compound of 炊飯 (suihan, 'rice cooking') and ジャー (jā, from English 'jar'), referring to the insulated container that keeps rice warm.