From Middle Low German stove 'heated room' — the word shifted from meaning the room to the apparatus that heats it.
An apparatus for heating or cooking, using fuel or electricity.
From Middle English stove 'heated room, bathhouse,' probably from Middle Low German or Middle Dutch stove 'heated room.' Originally meant a steam bath or heated room, not a cooking appliance. The shift to meaning the heating apparatus itself happened by the 16th century. Key roots