Found this on another forum.
Thanks to everyone for contributing to this forum. I learned a lot and would like to share my grilling success. I was looking for a 3 burner (with 4th side burner) 100% stainless natural gas (NG) grill with stainless burners and grills. I bought the Charmglow Model #720-0036-HD-05 at Home Depot for $349 fully assembled. This is an LP gas model manufactured by Nexgrill (
www.nexgrill.net) with a fully enclosed lower cabinet also made from stainless. The main upper gill is made from a high quality stainless (non-magnetic) and the lower cabinet is made from the lower grade (magnetic) stainless. The lower cabinet has a whole with a rubber grommet on the rear panel… perfect for your NG line to feed through.
1. To convert from LP to NG, I called the Nexgrill parts line at 800-913-8999 and ordered the natural gas (NG) orifices for $25 plus $6 shipping. The LP orifices that come standard are a 1.05 orifice size and the replacement NG orifice is a 1.50. The NG holes do look 50% larger. Simple installation instructions come with the new orifices. (You can also drill out the LP orifices but I wanted to keep the LP gas option.) You simply remove the knobs and front panel, replace the (3) orifices then reattached the front panel. Be sure to use some pipe tape to seal the threads on the orifice. Next, remove the side burner knob and valve, replace the (1) orifice then reattach the valve and knob. Be sure to make sure the orifices slide back into the burners when reattaching.
2. You may need to adjust open the 2 small flanges on the electronic starters to allow the natural gas to light. By bending the flanges open, the natural gas flows through the center of the metal contacts and ignites. If the flanges are closed, the natural gas will not ignite.
3. Connect your NG grill to your natural gas connection with a natural gas (not LP) appliance hose. Most standard NG appliance hoses are a maximum of 4 feet. I needed a 14ft one, so I went to the local “old fashion” hardware store and they made on for me on the spot for $23. It has the standard female end to connect to the house male fitting and a male fitting to connect to the gas grill female fitting.
4. The flames are a solid blue color and seem to provide adequate heat. I fired up the grill on high and reached 460 degrees (and climbing) in 10 minutes. With opening and closing the lid during grilling, I maintained a constant 400 degrees which cooked the burgers well. Happy Grilling!!
Here's another,
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.
http://forum.doityourself.com/showthread.php?t=256383
scroll down to a contributor named "Timhood"