Free Standing Patio Heaters are perfect for outdoor areas that don't have walls or overhead structures. Most Free Standing Patio Heaters are fueled by liquid propane that comes from LP tanks stored right inside those heaters making them completely portable. You can find portable models that are fueled by Natural Gas, like Sunglo A242, they are just a little less flexible when it comes to location. Free Standing Patio Heaters can also be a more permanent structure when they are fueled by Natural Gas and are attached to the ground - permanent post. Permanent Post Patio Heaters are safer than their portable counterparts because they reduce the danger of tipping over.