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Use this calculator to calculate the “EF” based upon the water heater efficiency and standby loss.
Simply enter in thermal efficiency and standby loss in Btu/hr for your water heater unit. If you need assistance with thermal efficiency and standby loss data, please see AHRI directory for water heater standards.
In , you have the power to choose a natural gas supplier.
Click “Continue” to see your options.
Or, “Cancel” to learn more about CenterPoint Energy.
