With its variable heat settings, the AZ Patio 94 Inch Tall Commercial Glass Tube Patio Heater makes it easier than ever before to stay in control. Not only are you able to freely modulate the heat output, but the heater features wheels that allow you freely move it at any time. The heater is able to operate on a 20-pound propane tank and features quartz glass tubes capable of delivering an impressive heat output. In order to add an extra layer of safety during operation, the heater features both thermocouple and anti-tilt safety devices.