We are offering here the Antique Glass Heaters for use that reach their hottest temperature after about one hour of running. The hottest that they will get is 186 degrees Fahrenheit. Heated glass is a resistance heater created when a transparent, electrically conductive coating is applied to float glass and then subjected to an electric current. The offered Glass heater is easy to install and made for use in the various industries. The Antique Glass Heaters are very effective and safe for use.