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Revised November 2009
AOSDG25300
Commercial Gas Boilers
UP TO 82% EFFICIENT HOT WATER SUPPLY BOILERS
The Dura-Max® series offers excellent performance and low-profile design flexibility for both
new construction and retrofit applications. A double-row, integral-finned copper tube heat
exchanger provides exceptional heat transfer efficiency. Each unit features a small footprint
with a built-in draft diverter for extra clearance to simplify installation. Reliable, quiet, drawer-
mounted stainless steel burners resist corrosion, improve access for easy maintenance.
FEATURES
100% ALL NON-FERROUS HEAT EXCHANGER WATERWAYS
• All waterways 100% copper, brass or bronze
• Won’t rust, resists thermal shock
• Heavy-duty bronze castings and copper heat exchange tubes
• Bronze removable return bends for easy access and inspection
of individual tubes
GASKETLESS WET SECTION
• Unique “O”-ring design compresses to form water-tight seal
positioned away from and outside the combustion chamber
• Isolated location offers optimum protection and years of service
DRAWER-MOUNTED, STAINLESS STEEL DURA-MAX® BURNERS
• Quiet operation and efcient, reliable design
• Protects against corrosion and condensation deterioration
• Easy slide-out burner tray simplies cleaning and maintenance
COMPACT, LOW-PROFILE DESIGN
• Built-in draft diverter provides extra clearance in tight, retrot installations
• Clean, compact jacket design for easy access and assembly
• Cool to touch and approved for combustible oors
INTERMITTENT ELECTRONIC IGNITION
• Eliminates standing pilot, saves energy
• Includes power ON/OFF switch
FACTORY-MOUNTED BRONZE-FITTED PUMP
• Ensures proper ow rates and efcient heat transfer
• Thermal Balancer Pump Delay Switch cycles pump,
reduces standby heat loss
MAXIMUM HYDROSTATIC WORKING PRESSURE: 160 PSI
MEETS ASHRAE/IESNA 90.1-2004
FIVE-YEAR HEAT EXCHANGER LIMITED WARRANTY
• For complete information, consult written warranty or contact A. O. Smith
MODELS
DW-720
thr ough
DW-1810