
















HOW TO USE THIS
CALCULATOR




1. Turn off
all appliances (including the pilot burner) except the appliance you


want to measure the BTU input for.






2. Turn the appliance on.






3. Clock the
time it takes the gas meter to show you have consumed 1 cubic


foot of natural gas (the number of cubit
feet can be adjusted to fit your


situation). Use a stop watch or the second
hand on your watch to time how


long it takes for the appliance to use
a given amount of gas (cubic feet of gas).






4. Enter the
amount of gas consumed on the form input






5.
Enter the minutes and seconds it took for the gas meter to register the


consumption measured in step 3. Example: To enter 1
minute and 20 seconds,


enter "1" in the minute text
box, and enter "20" in the seconds text box.






4. If you
know the BTU content of the natural gas in your area, enter it in the


natural gas BTU/CF. If you do not know the
actual BTU content for natural


gas in your area, use the default value of
1025 BTU per cubic foot.






5. The
appliance is burning the BTU that show in the results window. Please be


aware that this is the input, not the
output. Vented fossil fuel appliances are


never 100% efficient. Actual efficiencies
can be between 55% and 98%.








