Prism Hardscapes PH-441-FBUWNG Ibiza Ultra White Fire Bowl Natural Gas. The Ibiza fire bowl provides an outdoor retreat of warmth and ambiance. Each bowl has been hand-crafted using our custom patina finishing process, guaranteeing a one-of-a-kind creation with subtle variation. The 31¼” square bowl provides a beautiful and functional centerpiece for any backyard, patio or lounging area. The ambient heat provides plenty of warmth for multiple people. The 65,000 BTUs unit operates on either Propane Gas or Natural Gas.