United States bought this(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
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