As of 2014, a Chi flat iron ranges in temperature from 370 degrees Fahrenheit to 425 degrees Fahrenheit, depending on the model and setting. Models such as the Air Classic Tourmaline Ceramic and the Ultra Iron have only one heat setting, whereas the G2 Ceramic and Titanium Iron has three.
Since Chi flat irons do come in a range of maximum temperatures, it is necessary to determine the type of hair being styled to select the appropriate product to use. Fine and chemically treated hair must never be ironed at temperatures above 300 degrees Fahrenheit, and medium hair is best styled in the 300 to 380 degree Fahrenheit range. Coarse hair is capable of withstanding higher temperatures in the range of 350 to 400 degrees Fahrenheit.