The Sunglo Permanent Mount Natural Gas Heater in Stainless Steel is a wonderful alternative to bulky patio heaters reliant on refillable propane tanks. The in-ground post design minimizes the deck space needed for installation and creates a streamlined appearance. Also, no bulky base and potential tripping hazard. Having the unit directly plumbed to your natural gas line ensures you always have a supply source that will never run out. So you'll be able to enjoy the comforting warmth for hours on end, without concern of being left out in the cold. The heater is manually controlled and requires no electric connections. Once the pilot is manually lit, you'll be able to turn the unit on/off with the control knob found at the front of the unit. The durable, heavy duty corrosion resistant construction of the heater makes it resistant to the harsh elements of the weather, for guaranteed years of use and enjoyment. The heater produces up to 50,000 BTUs of warmth in an almost 12' diameter. For added peace of mind, the heater also features a 100% safety shutoff control. If you are considering multiple units in a single area, it is recommended that each heater be at least 12 Ft apart.