A horizontal tank with the same capacity is 24 inches in diameter and 66 inches long, whereas a vertical tank with the same capacity is 55 inches tall and 30 inches in diameter. To accommodate expansion, a 120-gallon tank carries 96 gallons of propane.
A vertical tank of this capacity weighs 175 pounds when empty and 600 pounds when fully inflated. A horizontal 120-gallon tank weighs 725 pounds when full compared to 300 pounds when empty.
Gas is supplied from these tanks to appliances including kitchen ranges, laundry dryers, space heaters, and water heaters. In order to prevent fires, propane tanks are typically located next to buildings at a minimum distance of 10 feet from any electric ignition source.