Something about the sets on Homefront that still puzzles me is the metal fixture you see on top of each of the refrigerators. They're white and shaped like a bit like a humidifier (or a UFO) and sit on top of the refrigerators in the Metcalf kitchen, the Davis kitchen... even Judy's kitchen. (I can't recall right now having seen one at the Sloans'). I've always guessed these were hot water heaters, but I've never known for certain. And when I look about online, the ads I see for hot water heaters in the 1930s and '40s are always much larger units - as tall as refrigerators themselves! So what are these items? Any ideas???