Answer: “A couple of years ago, I fixed up and modernized an old house for a young couple. There was a built-in wall heater that started out as gas but later the burner part was removed and electric guts got put in. I just gutted the thing and put a modern plug in it and left it. Their budget was very low. The old gas wall heaters didn’t have vents. The hole at the bottom would be for the gas line. I have seen a lot of the old gas ones that had an electric insert put in them later on. I have taken out many of them and left the metal liner and put in a modern plug.”