AACBCL3-100T199-6NOX 100 Gallon American Water Heaters Natural Gas Water Heater All Heavy-Duty Commercial Gas units have a glass coated internally-lined tank fired at 1600°F. This provides a tough interior surface for storage tanks and maximum protection against the wearing effects of high-volume and high-temperature water. Ideal for most medium to heavy duty commercial applications requiring a motorized flue damper.Motorized flue damperNon-CFC Polyurethane Foam to prevent heat loss and reduce energy costsFused Ceramic Shield Tank for anti-corrosion protection24-Volt Thermostat ControlElectronic Thermister SensorPower cordFactory-installed Temperature & Relief Valve.Multiple anode rod4" Diameter Hand Hole CleanoutTested and listed with CSA International in accordance with the latest addition of ANSI Z21.10.1 or .3 CSA 4.3 for up to 180°F, as an automatic storage heater. ASHRAE Standard 90.1 1989 addendum 90.1 b. California (CEC) and New York energy requirements met or exceeded. *ASME Models