They are rated in gallons because propane is stored in liquid form in propane tanks.
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Propane tanks are rated for water capacity because it helps determine the tank's overall volume and its ability to safely store propane gas under pressure. Water capacity is used as a standard unit of measure in the propane industry for consistency and safety regulations.
The Letters "WC" on a propane tank stand for "Water Capacity", and are followed by a number which would identify the tanks Water Capacity typically measured in lbs. Water weighs approximately 8.3lbs per gallon Propane weighs approximately 4.24lbs per gallon
The capacity of a propane tank with a gross water capacity of 285 gallons is typically around 200 gallons. This allows for expansion room when the propane is being stored or transported. It is important not to fill the tank to its maximum water capacity to prevent overfilling and potential safety hazards.
A 100 pound propane cylinder can hold approximately 23.6 gallons of water.
Assuming the propane cylinder you mentioned is a standard 20 lb propane tank, it would hold around 4.7 gallons of water. This varies depending on the specific dimensions of the tank.
Tankless water heaters can be powered by electricity or propane. Electric tankless water heaters are more common, but propane tankless water heaters are popular in regions where natural gas is not available. Both types offer energy efficiency and the convenience of on-demand hot water.