This GSU-402-208-CT urn heater is obsolete. The 256129 is the replacement immersion heater that would ship. Urn heaters are built with a lower watt density to provide a long heater life and dependable performance. Urn heaters can be designed for use in commercial coffee makers, percolators, restaurant buffet tables, sterilizers, autoclaves, steam tables, kettles, and humidifiers. These immersion heaters are ideal for other applications that require a low profile and short tubular element lengths.

The 256129 urn heater is made for applications requiring 208 volt power single phase and 4000 watts. In the urn heater diagram that is shown below, the "A" overall heater length dimension is 9.5 inches, the "B" inside tank height is 2.125 inch, and the "C" width dimension is 3-1/16 inches. This heater comes with two COPPER sheath tubular elements that are silver brazed into a brass header. This heater is also supplied with a standard 4 inch octagon square box.
The Glenn Electric/ Backer Marathon immersion heater part numbers are also GSU-402-208-CO or 10-6385-11. Chromalox part number is 256129.

An optional thermal cut-off IS SUPPLIED with this immersion heater. This protective mechanism will shut the power off to the heater whenever a low liquid level is detected.