I bought 2 "mr heater" units last fall to thaw out the groomer tractors quicker than just letting them sit. One was a 125000 and the other a 210000.To make a long story short,the 125000 works great,but the first 210 lasted a week and the flame sensor went out. They sent a new one,two days later it starts doing the delayed ignition w/lots of smoke/fumes thing. I called them and they said take it back. I did and tsc cheerfully gave me another one. Two days later it starts lighting late,then the sob catches on fire. Did that 2 times,I called them again. they said take it back,so I did,but tsc didnt have any more of them,so I went over to family farm and got one. Ran it a week and it started the same thing,only caught on fire once though!.Took it back and they were out of them but had a 175000,so I took it. Its worked fine. I took pics of the smoke and fire episodes,but I really think they have a problem with the 210000's and either dont know it or are not acknowledgeing it(toyota syndrome?). Any how, just thought I'd pass my experience along.