 Defender Safety System® Comb12™ & Non-Defender Models
The Combi2™ is the ultimate system for perfect home comfort and potable water from a single energy-saving source. The secret lies in the patented 1½" O.D. glass coated (Vitraglas®) steel coil heat exchanger. First, the Combi2™ heats the potable water in the tank. Then, the heat from the hot water is efficiently transferred through the heat exchanger to the heating fluid within the coil. 75-gallon model does not include the Defender Safety System®.
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Defender Safety System Features
- Advanced ScreenLok® Technology Flame Arrestor design
- Resettable thermal switch
- Piezo ingiter
- Maintenance free
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Pedestal base
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Sight window
Standard Energy Saver Features
- Heat exchanger - 1½" O.D. glass coated (Vitraglas®)steel coil
- Low heat exchanger head loss - Up to 10 GPM flow, with less than 5 ft. of head loss
- Factory installed Hydrojet® Total Performance System
- Vitraglas® lining
- Factory installed dielectric waterway fittings
- Two protective aluminum anode rods
- T&P relief valve installed
- Thermostatic mixing valve
- Brass drain valve
- 2" Non-CFC foam insulation
- 10-year limited warranty on tank and heat exchanger
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How the Defender Safety System® Works
During normal operation, air for combustion is drawn into the water heater through the opening in the jacket. This air travels down and around the combustion chamber and enters through holes in the very bottom of the corrosion-resistant combustion chamber. The air then travels up through the oriented flame arrestor plate louvers, where the velocity of the air is increased and its direction altered. The air then mixes in a normal manner with the supplied gas and is efficiently combusted, producing very low NOx emissions. In the case where trace amounts of flammable vapors are present in the air flowing into the combustion chamber, the burner or pilot flame harmlessly ignites the vapors.
If flammable vapors are in sufficient quantity to prevent normal combustion the burner and pilot flame is shut down. Should the flammable vapors continue to the burner, the flame arrestor plate prevents the flames from traveling backwards and igniting vapors outside of the combustion chamber. The calibrated, multipurpose thermal switch recognizes this and shuts down the pilot and main burner. This switch also deactivates the burner and pilot in the unlikely event of restricted airflow caused by severe lint, dust or oil accumulation on the arrestor plate.  The heart of Bradford White’s Defender Safety System® is the flame arrestor design of the patented ScreenLok® Technology. This precisely engineered and manufactured component is made 304L alloy stainless steel and contains up to eighteen thousand, geometrically oriented louvers. These micro dimensioned louvers increase the velocity of incoming air to the system. If flammable vapors enter this uniquely designed system and are ignited, a vector effect occurs inside of the combustion chamber. The combination of high velocity air entering the chamber and the vector effect caused by combustion will prevent any flames present in the chamber from traveling backwards through the flame arrestor plate and outside of the water heater.
The Bradford White Defender Safety System® maintains outstanding efficiency, a long service life and very low NOx emissions. Best of all, it provides maintenance free operation while meeting the stringent ANSI standard for the affected gas water heaters. |
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