Hello - Could anyone tell me if there is a difference between a "Gas" BBQ or a "Propane" BBQ. I recently had a house build and had it plumbed with a natural gas line to the back porch for a BBQ. When I went to buy the grill no one could tell me the difference, or the correct one for my application. I don't just want something that will work. I want the right one and want to know why. Thanks in advance BBQ coinsures.