As these courses show, there are two main types of propane tanks. DOT cylinders, familiar to homeowners with propane grills, are generally used above ground and typically don't contain more than 25 gallons of propane. Horizontal ASME tanks can hold 250 to more than 1,000 gallons and are safe to bury underground, out of sight. Working with a propane retailer is key to determining the best size and placement of propane tanks.
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