The GSU-1003-208-CT urn heater is made for applications requiring 208 volt power three phase and 10000 watts. In the urn heater diagram that is shown below, the "A" overall heater length dimension is 16.5 inches, the "B" inside tank height is 2.25 inch, and the "C" width dimension is 4 inches.

The GSU-1003-CT urn heater is made for applications requiring 240 volt power three phase and 10000 watts. In the urn heater diagram that is shown below, the "A" overall heater length dimension is 16.5 inches, the "B" inside tank height is 2.25 inch, and the "C" width dimension is 4 inches.

The TTUH-CO-15 (pcn186079) made by Chromalox is made for applications requiring 120 volt power single phase, 1500 watts, and 12.5 amps. In the urn heater diagram that is shown below, the "A" overall heater length dimension is 7-7/16 inches, the "B" height is 4-13/16 inch, the "C" width dimension is 3-1/16 inches and the "D" dimension is 2-1/8 inches.

The TTUH-CO-15 (pcn256049 NS) made by Chromalox is made for applications requiring 208 volt power single phase and 1500 watts/7.2 amps. In the urn heater diagram that is shown below, the "A" overall heater length dimension is 7-7/16 inches, the "B" height is 4-13/16 inch, the "C" width dimension is 3-1/16 inches and the "D" dimension is 2-1/8 inches.

The GSU-1203-CT urn heater is made for applications requiring 240 volt power three phase and 12000 watts. In the urn heater diagram that is shown below, the "A" overall heater length dimension is 16.5 inches, the "B" inside tank height is 2.25 inch, and the "C" width dimension is 4 inches.

The GSU-152-120-CT similar urn heater is made for applications requiring 125 volt power single phase and 1500 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 1.375 inch, and the "C" width dimension is 3 inches.

The TTUH-CO-15 (pcn 256057 NS) made by Chromalox is made for applications requiring 240 volt power single phase and 1500 watts. In the urn heater diagram that is shown below, the "A" overall heater length dimension is 7-7/16 inches, the "B" height is 4-13/16 inch, the "C" width dimension is 3-1/16 inches and the "D" dimension is 2-1/8 inches.

The GSU-202-120-CT urn heater is made for applications requiring 120 volt power single phase and 2000 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 1.375 inch, and the "C" width dimension is 3 inches.

The GSU-202-208-CT urn heater is made for applications requiring 208 volt power single phase and 2000 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 1.375 inch, and the "C" width dimension is 3 inches.

The GSU-202-CT SIMILAR urn heater is made for applications requiring 240 volt power single phase and 2000 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 1.375 inch, and the "C" width dimension is 3 inches.

The GSU-302-208-CT replacement urn heater is made for applications requiring 208-volt power single phase and 3000 watts. In the urn heater diagram that is attached below, the overall heater element length dimension is 6.75 inches (was 7.5 inches), the inside tank height is 2.125 inches (was 1.375 inches), and the heater element width is 3-1/16 inches (was 3 inches). This heater comes with two copper (was stainless steel) sheath tubular elements that are silver brazed into a brass header. This heater is also supplied with a standard 4-inch square or octagon conduit box.

This GSU-302-CT drop-in replacement urn heater is made for applications requiring 240-volt power single phase and 3000 watts, and it has a thermal cutout.

The GSU-402-208-CT 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 "D" 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 conduit box.
The Glenn Electric/ Backer Marathon cross reference part numbers are GSU-402-208-CO or 10-6385-11. An optional thermal cut-off is supplied with this immersion heater.

The GSU-402-CT comparable urn heater is made for applications requiring 240 volt power single phase and 4000 watts. For this urn heater, the "A" overall heater length dimension is 9.50", the "D" inside tank height is 2.125", and the "C" width dimension is 3-1/16" (was 3 inches). This heater comes with two copper (was stainless steel) sheath tubular elements that are silver brazed into a brass header. This heater is also supplied with a standard 4 inch square conduit box. The heater needs a minimum 2-7/16" (was 2-3/8 inch) diameter hole for installation. 

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.

The GSU-403-CT urn heater is made for applications requiring 240 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.

The GSU-502-208-CT similar urn heater is made for applications requiring 208 volt power single phase and 5000 watts. In the urn heater diagram that is shown below, the "A" overall heater length dimension is 11 inches, the "B" inside tank height is 2.25 inch, and the "C" width dimension is 4 inches.

The GSU-502-CT urn heater is made for applications requiring 240 volt power single phase and 5000 watts. In the urn heater diagram that is shown below, the "A" overall heater length dimension is 12.75 inches, the "B" inside tank height is 1-5/16 inch, and the "C" width dimension is 4 inches.

The GSU-503-208-CT urn heater has been obsoleted and is an immersion heater built with a lower watt density to provide a long heater life and dependable performance.

The GSU-503-CT urn heater replacement option is the TTUH-CO-503. It is made for applications requiring 240 volt power three phase and 5000 watts. In the urn heater diagram that is shown below, the "A" overall heater length dimension is 11 inches.

The TTUH-CO-60 urn heater is made for applications requiring 208 volt power single phase and 6000 watts. In the urn heater diagram that is attached below, the "A" overall heater length dimension is 14.5" (was 13.5 inches), the "B" inside tank height is 2.125" (was 1 inch), and the "C" width dimension is 4" (was 4 inches).

The GSU-602-CT SIMILAR urn heater is made for applications requiring 240 volt power single phase and 6000 watts. In the urn heater diagram that is shown below, the "A" overall heater length dimension is 13.5 inches, the "B" inside tank height is 1 inch, and the "C" width dimension is 4 inches.

The GSU-603-208-CT urn heater is made for applications requiring 208 volt power three phase and 6000 watts. In the urn heater diagram that is shown below, the "A" overall heater length dimension is 11 inches, the "B" inside tank height is 2.25 inch, and the "C" width dimension is 4 inches.

The GSU-603-CT urn heater is made for applications requiring 240 volt power three phase and 6000 watts. In the urn heater diagram that is shown below, the "A" overall heater length dimension is 11 inches, the "B" inside tank height is 2.25 inch, and the "C" width dimension is 4 inches.

The GSU-702-CT urn heater is made for applications requiring 240 volt power single phase and 7000 watts. In the urn heater diagram that is shown below, the "A" overall heater length dimension is 13.5 inches, the "B" inside tank height is 1 inch, and the "C" width dimension is 4 inches.

This GSU-703-208-CT similar urn heater is made for applications requiring 208 volt 3 phase power and 7000 watts. The overall heater element length is 11-1/16 inches, the inside water tank height is 3 inches, and the overall heater element width is 4-1/16 inches. The overall height from element top to conduit box bottom is 5-3/4 inches. A 3 inch MINIMUM liquid depth is required to run this urn heater. 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 square conduit box plus a gasket.
The Glenn Electric/Marathon immersion heater similar part numbers are GSU-703-208-CO OR 10-8346-27.

The GSU-703-CT urn heater is made for applications requiring 240 volt power three phase and 7000 watts. In the urn heater diagram that is shown below, the "A" overall heater length dimension is 11 inches, the "B" inside tank height is 2.25 inch, and the "C" width dimension is 4 inches.

The GSU-803-208-CT urn heater is made for applications requiring 208 volt power three phase and 8000 watts. In the urn heater diagram that is shown below, the "A" overall heater length dimension is 13.5 inches, the "B" inside tank height is 2.25 inch, and the "C" width dimension is 4 inches.

The GSU-803-CT urn heater is made for applications requiring 240 volt power three phase and 8000 watts. In the urn heater diagram that is shown below, the "A" overall heater length dimension is 13.5 inches, the "B" inside tank height is 2.25 inch, and the "C" width dimension is 4 inches.

The GSU-903-208-CT urn heater is made for applications requiring 208 volt power three phase and 9000 watts. In the urn heater diagram that is shown below, the "A" overall heater length dimension is 13.5 inches, the "B" inside tank height is 2.25 inch, and the "C" width dimension is 4 inches.