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The Atmospheric Vent FVIR Defender Safety Systemer Models Feature: Bradford White ICON System *Intelligent gas control with proven millivolt powered technology and built-in piezo igniter. A standard off the shelf thermopile converts heat energy from the pilot flame into electrical energy to operate the gas valve and microprocessor. No need for external electricity. Enhanced PerformanceProprietary algorithms provide enhanced First Hour Rating and tighter temperature differential. Advanced Temperature Control SystemMicroprocessor constantly monitors and controls burner operation to maintain consistent and accurate water temperature levels. Intelligent DiagnosticsAn exclusive green LED light prompts the installer during start-up and provides ten different diagnostic codes to assist in troubleshooting. Pilot On IndicationFlashing green LED provides positive indication that pilot is on. Separate Immersed ThermowellHigh-strength advanced polymer composite thermowell provides isolation between electric temperature sensor and surrounding water. No need to drain the tank when removing gas valve. Advanced ScreenLoker Technology Flame Arrestor DesignFlame arrestor is designed to prevent ignition of flammable vapor outside of the water heater. Resettable Thermal SwitchProven and reliable bimetallic switch prevents burner and pilot operation in case of ongoing flammable vapors burning inside of the combustion chamber or restricted air flow. Maintenance-FreeNo regular cleaning of air inlet openings or flame arrestor is required under normal conditions. Sight WindowOffers a view into the combustion chamber to observe the operation of the pilot and burner. Factory-Installed Hydrojeter Total Performance SystemSediment reducing device that also increases first hour rating of hot water while minimizing temperature build-up in tank. Vitraglaser LiningAn exclusively engineered enamel formula that provides superior tank protection from the highly corrosive effects of hot water. This formula Vitraglaser is fused to the steel surface by firing at a temperature of over 1600F 871C. Insulation SystemNon-CFC foam covers the sides and top of the tank reducing heat loss. This results in less energy consumption improved efficiencies and jacket rigidity. Pedestal Base. Water Connections3/4 19mm NPT factory installed true dielectric fittings. Factory-Installed Heat Traps. Protective Magnesium Anode Rod. 3×4 Snap Lock Draft DiverterAllows either 3 76mm or 4 102mm vent connections with inputs of 40000 BTU/Hr. or less. Over 40000 BTU/Hr. has the 4 102mm Snap Lock Draft Diverter. TP Relief ValveInstalled. Low Restrictive Brass Drain ValveDurable tamper proof design. NOx EmissionsLess than 40 ng/J.