Not only can one convert from LP to Natural Gas (easy) or NG to LP (a little more difficult), but several companies even sell conversion kits for this. In fact, I personally converted my Char-Broil Commercial series grill from LP to Natural Gas using a Char-Broil conversion kit just yesterday. The kit consisted of basically a tool (a wrench that made it easy to access the orifices), a flexible 3/8" hose with quick disconnect and some new bezels for the knobs that say “natural gas” on them. The latter item is optional and has nothing to do with performance.
The process of converting from LP to Natural gas is essentially to enlarge the orifice for each burner (accomplished by removing the existing orifice, and depending on the kit, replacing with a new orifice, or, if the conversion is being performed without a kit, drilling out the existing orifice). Next, the LP gas regulator is removed and the flexible hose is connected in it’s place.
Using the manufacturer’s kit, I completed the task for 6 burners in about 20-25 minutes, including the regulator/hose replacement.
Converting from NG to LP is slightly more difficult because a smaller orifice must be used (so they cannot be drilled out–obviously). Either the smaller orifice must be purchased, or they would have to be welded and re-drilled smaller (quite a bit of effort). Next, the regulator must be installed (and purchased if not on-hand already).
That’s it. There are no other parts involved. All other parts of the grill work just as well with either fuel.
The only reason some manufacturers sell specific LP or NG models is convenience to the customer who does not want to have to perform this conversion.
Took from doityourself:user timhood