Which of the following best describes the second step in determining total gas demand?

• A. Determine the BTU/hr input ratings of all appliances currently serviced by the propane system and all appliances that may be added in the future
• B. Locate the propane-fueled appliances currently installed in the customers home
• C. Take the BTU/hr input for all existing and future appliances and add them together
• D. Estimate demand based on home size

Answer: (A)

To size the gas system, you first need exact energy requirements for each appliance. The second step is to determine the BTU/hr input ratings for every propane-fueled appliance that is currently served by the system and for those that may be added in the future. Having these ratings collected gives you the precise data you need to calculate total demand, which you’ll then combine in the next step. Merely locating appliances doesn’t tell you how much gas they require, and estimating demand from home size is too rough for accurate sizing. You can’t properly sum demands without first identifying the BTU/hr inputs.