Originally Posted by annerj
And maybe different burners as the LP/NG burn a bit differently.
Of course they do, LP burns a whole lot hotter, since it's a refined product C3H8 (yes, I watch Good Eats

) and that is the reason why Natural Gas burners are bigger, they need more gas to produce the same amount of heat
I have a permanent (OK almost permanent) built in for my grill, and I run LP. Running a natural gas line would have been a nightmare, and I have two tanks, it has enough space to handle two in its doors