I"d write/call Brinkman. They might sell the proper venturi to do the job. I don't know what the tradeoff would be. Propane is more expensive and more efficient than NG.. so, I believe it would take longer with NG to do the job.. ie a lot of NG. I, personally, like the speed of propane. This is an awesome burner.
Hop Song Brewing
A fine beer may be judged with only one sip, but it's better to be thoroughly sure.
Bottled n Kegged 2 APA's, Milk Stout
Up Next: APA, Dry Stout