There are various advantages to using glass-lined water heaters.
Corrosion is prevented in glass-lined water heaters because the glass and metal work together to keep the metal from rusting.
The glass liner keeps metal and contaminants out of the water, resulting in cleaner, healthier hot water for everyday use.
The smooth surface of the glass lining facilitates heat conduction, which decreases energy waste and shortens the time necessary to achieve a target temperature.
Because glass-lined water heater tanks do not gather silt and scale like unlined equivalents, they require less regular cleaning.