The GSU-403-208-CT urn heater is an immersion heater 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 GSU-403-208-CT urn heater is made for applications requiring 208 volt power three phase and 4000 watts. In the urn heater diagram that is shown below, the "A" overall heater length dimension is 7.5 inches, the "B" inside tank height is 1.875 inch, and the "C" width dimension is 3 inches. This heater comes with two stainless steel sheath tubular elements that are silver brazed into a brass header. This heater is also supplied with a standard 4 inch octagon conduit box. The Glenn Electric immersion heater part number is GSU-403-208-CO or 10-8346-25. 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. Click here to learn how to install an urn heater immersion heater with a thermal cut-off. Installing an Urn Heater with a Thermal Cut-Off