What is the approximate BTU capacity of a 30lb propane cylinder?

A 30-pound propane cylinder typically contains about 7 gallons of propane, and propane has a specific energy content of approximately 91,500 BTUs per gallon. To find the total BTU capacity of the cylinder, you would multiply the number of gallons by the BTU content per gallon.

In this case, the calculation would be:

7 gallons × 91,500 BTU/gallon = 640,500 BTUs.

This figure is generally rounded to about 647,420 BTUs for a 30-pound cylinder, reflecting various factors such as the exact density of the propane and efficiency considerations. Thus, the correct answer highlights the approximate BTU capacity of the cylinder, aligning with industry standards and practices. This makes it essential for technicians to understand how to calculate propane amounts and their corresponding BTU outputs when working with propane systems.