How do I know what model All Nighter I have. It says Moe on the lower left of the front door of it. It has the two vents on top where it slopes up, one 6 inch exhaust tube in the back, and a little round hole on the lower right side. It has a nice handle with a wooden grip. What model do I have? Also, are they UL Approved/Listed? A Wood stove guy was here to give me an estimate on a new liner for my chimney and he said that was a very inefficient heater, not UL listed and we should get rid of it. He said he won't hook it up. Any help of evidence of the contrary would be very helpful. Thank you everyone!