I know this is an old post, but I hate to create a new one for my question. I just bought a Blichmann burner and going from a cheap-o turkey burner...WOW..that sucker was cook'n! I went from boils at 45min to about 20 mins. The problem is that I did a 90min boil and by 60mins in there was noticeable decrease in output. I thought my tank was dying until I saw that it was frosted over like a mutha and then I shook it and heard ice inside. Then next day it was back to normal and lit right up without issues, thus showing that it did have plenty of propane left in it. So what do I do? Was I putting out too many BTUs and should back down next time? I did blow my previous evaporation rate away...so I guess it wouldn't hurt to back off a bit....but there's so much power begging me to harness all of it!!!