A 120-gallon propane tank weighs approximately 420-450 pounds when empty.
A 120-gallon propane tank typically weighs between 420 and 450 pounds when empty. When filled to capacity with propane, the total weight increases to approximately 1,320 pounds. The tank's weight varies slightly depending on the manufacturer and specific design, with steel construction being the standard material used for these residential propane storage containers.
Weight comparison of common propane tank sizes
| Tank Size (gallons) | Empty Weight (lbs) | Full Weight (lbs) | Propane Capacity (lbs) |
|---|---|---|---|
| 120 | 420-450 | 1,320 | 870 |
| 250 | 1,060 | 2,540 | 1,480 |
| 500 | 2,150 | 4,720 | 2,570 |
Factors affecting propane tank weight
- Material construction (steel vs aluminum)
- Wall thickness and pressure rating
- Manufacturer specifications
- Additional fittings and valves
Installation considerations based on weight
The substantial weight of a 120-gallon propane tank requires proper installation on a stable, level surface. Most installations require a concrete pad or compacted gravel base to prevent settling. Professional installation is recommended due to the tank's weight and the need for proper connections and safety measures. The filled weight of 1,320 pounds creates significant ground pressure that must be distributed appropriately to prevent sinking or tilting over time.