Bradford White's high efficiency, energy saver, atmospheric vent residential gas water heater features the Defender Safety System® and offers additional insulation and integral heat traps to reduce stand-by heat loss. Features: 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 Performance - Proprietary algorithms provide enhanced First Hour Delivery ratings and tighter temperature differentials. Advanced Temperature Control System - Microprocessor constantly monitors and controls burner operation to maintain consistent and accurate water temperature levels. Intelligent Diagnostics - An exclusive green LED light prompts the installer during start-up and provides ten different diagnostic codes to assist in troubleshooting. Pilot On Indication - Flashing green LED provides positive indication that pilot is on. Separate Immersed Thermowell - High 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 ScreenLok® Technology Flame Arrestor Design - Flame arrestor is designed to prevent ignition of flammable vapor outside of the water heater. Resettable Thermal Switch - Proven and reliable bimetallic switch prevents burner and pilot operation in case of ongoing flammable vapor burn inside of the combustion chamber or restricted air flow. Maintenance Free - No regular cleaning of air inlet openings or flame arrestor is required under normal conditions. Sight Window - Offers a view into the combustion chamber to observe the operation of the pilot and burner. Factory Installed Hydrojet® Total Performance System - Cold water inlet sediment reducing device helps prevent sediment build up in tank. Increases first hour delivery of hot water while minimizing temperature build up in tank. Vitraglas® Lining - Bradford White tanks are lined with a exclusively engineered enamel formula that provides superior protection from the highly corrosive effects of hot water. This formula (Vitraglas®) is fused to the steel surface by firing at a temperature of over 1600ºF. 2" Non-CFC Foam Insulation - Covers the side and top, reducing the amount of heat loss. This results in less energy consumption, improved operation efficiencies and jacket rigidity. Pedestal Base. Water Connections -3/4" NPT factory installed true dielectric fittings. Factory Installed Heat Traps. Protective Magnesium Anode Rod. 3x4 "Snap Lock" Draft Diverter - Allows either 3" or 4" vent connections with inputs of 40,000 BTU/Hr or less. T&P Relief Valve - Included. Low Restrictive Brass Drain Valve - Durable tamper proof design. NOx Emissions - Less than 40 ng/J. Specs – Intended Household: 3-5 Person Fuel Type: Natural Gas Capacity (Gallons): 50 BTU Input: 40000 1st Hour Delivery (Gallons): 81 Vent Type: Atmospheric Height (Inches): 60.5" Diameter (Inches): 22" Depth (Inches): 22" Warranty: 6 Year Limited Tank/ 6 Year Limited on Component Parts Energy Factor: 0.63 Energy Star Rated: No Max Altitude (Feet): 2000 Application: Plumbing Water Connection: 3/4" Vent Size: 3 x 4 Recovery Efficiency: 80% Weight (lbs): 154 lbs