Your Reliance serial number shows your water heater was made in July 1994.
Except for the Marathon water heaters, and copper-tank water heaters, all tank-type water heaters are made of steel. That steel has an enamel coating which people call a glass liner.
So in that sense, there is a glass liner.
See a photo of the liner:
http://waterheatertimer.org/images/Enamel-coated-steel-290.jpg
Also inside the tank is an anode rode.
The anode is made to protect the steel tank.
Anode is made from lower noble metal than steel, so water reacts with the lower noble metal first.
The water eats away the anode rod instead of rusting the tank.
Once the anode rod is gone, the water begins rusting the tank.
The enamel coating does not protect the steel from rusting.
The tank rusts away and begins to leak.
http://www.thisoldhouse.com/toh/video/0,,20047047,00.html
http://waterheatertimer.org/Replace-anode-rod.html
http://waterheatertimer.org/9-ways-to-save-with-water-heater.html
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