The cost of energy is highly dependent on your particular location. A typical value is $1.50 per Therm, but it is recommended that you check local fuel bills or contact local energy suppliers for a more representative number to use.
Disclaimer: The American AmeriSize sizing program is a tool that can be used to estimate water heater requirements for many common applications. AmeriSize is intended to assist in selecting water heaters or boilers that best meet the specific job requirements. It is the sole responsibility of the system designer to select the correct products needed for the specific application. American reserves the right to make changes to AmeriSize without notice. For more see Terms of Use.