How Do You Convert A Propane Fireplace To Natural Gas

I am wondering if you can convert the lp or propane gas to natural gas on a bosch tankless hotwater heater.
How do you convert a propane fireplace to natural gas. I just need to figure out which parts to buy. I am guessing it has a different orfice and regulator does a fireplace that runs on gas. The kit comes with fittings and the flow regulator parts gaskets and compression springs you will need to modify the fireplace regulator unit. A lot of grills are already ready for a propane conversion.
I found an online dealership selling parts for the fireplace and it looks like the fireplace has a separate set of parts for natural gas and propane. Using the wrench remove the hose from your natural gas source and make sure that it is capped or shut off. Step 1 remove old hose. But there are different approached to converting and a few things to consider first like the cleanliness and quality of the existing fireplace.
Converting a natural gas grill. To change propane fireplaces to natural gas requires that you purchase a conversion kit from the company that manufactured your fireplace. Wood burning fireplaces can be converted to gas fireplaces.