I upgraded my burner from a turkey fryer to the in house 220k btu burner from AIH. Holy crap, is it a big difference.
Before: set the turkey fryer at full tilt, with lid on, and wait maybe half an hour, check, and slowly creep up to a boil. Then turn it down a bit to maintain a lazy boil.
After: Light burner, turn it up halfway until flames lick up over the edges of the kettle, nearly boil over after 10 minutes. Struggled to find a low enough valve setting to maintain a boil. Holy crap.
I'm kind of happy, but I'll need to finesse the low end to get a good rolling boil with 5 gallon batches. This thing is pretty powerful.