I've had my Mr. Heater for around 9 years. I've never had any problems with it blowing out or going off when moved. At times it "Howls" when first fired up, but a finger over the air intake fixes the howling problem. After 5 minutes, when everything gets warmed up, it works just fine. It put's out too much heat for the Trap but works fine in the big Clam. When run on low, in the Clam, we can only leave it on for around 15 minutes per hour....it get's too hot. The bonus is that it also works great heating up a can of stew or soup.