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Domestic Hot Water Boilers
MODELS
DW -720
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, drawermounted stainless steel burners resist corrosion, improve access for easy maintenance.
FEATURES
100% ALL NON-FERROUS HEAT EXCHANGER WATERWAYS
of individual tubes
GASKETLESS WET SECTION
positioned away from and outside the combustion chamber
DRAWER-MOUNTED, STAINLESS STEEL DURA-MAX® BURNERS
through
DW- 1810
COMPACT, LOW-PROFILE DESIGN
INTERMITTENT ELECTRONIC IGNITION
FACTORY-MOUNTED BRONZE-FITTED PUMP
reduces standby heat loss
MAXIMUM HYDROSTATIC WORKING PRESSURE: 160 PSI
MEETS CURRENT EDITION ASHRAE/IESNA 90.1
FIVE-YEAR HEAT EXCHANGER LIMITED WARRANTY
July 2011R
Revised November 2009
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AOSDG25300
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OTHER DURA-MAX® FEATURES
DURA-MAX® OPTIONS
INPUT AND RECOVERY
Domestic Hot Water Boilers
MINIMUM CLEARANCES TO COMBUSTIBLES ALL MODELS
CM
12
18
REAR
VENT
Alcove
MODEL
NUMBER
BTU
INPUT
PER
HOUR*
720,000
840,000
1,080,000
1,210,000
1,480,000
1,810,000
GPH
OR
LPH
RECOVERY -GALLONS OR
LITRES PER HOUR AT
DEGREE RISE
22°C
8920
3007
11,381
3903
14,774
4388
707
3122
943
1073
1203
1342
78°C
1911
2230
2902
3880
4221
* Natural gas only
Revised November 2009
July 2011R
www.hotwater.com
Page 2 of 4
AOSDG25300
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Domestic Hot Water Boilers
INPUT/OUTPUT, FLOW RATE (GALLONS AND LITRES PER MINUTE) AND PRESSURE DROP
GPM LPM GPM LPM
720,000
840,000
79 297 2.1 198 3.3 1.0 39 149 1.9
1,080,000
1,210,000
1,490,000
1,810,000
Pressure drop shown is loss through boiler only, and does not include any additional piping.
992,200
1,107,000
1,184,000
1,288,000
1,448,000
89 339 1.4 2.1 1.4 0.4
100 379 2.7 0.8 190
112 423 2.1 282 3.2 1.0 212 1.8
120 7.9 2.4 80 302 3.9 1.2 2.1
130 492 2.9 87 328 3.0 0.9
DIMENSIONS AND SHIPPING WEIGHTS
223 1.1 39 149 1.7 29 111 1.0 0.3
4.8 173 2.1 34 130
12.0
3.7 98 1.9 73 277 3.9 1.2
MODEL
NUMBER
INCHES OR
CM
CM
CM
CM
CM
CM
CM
CM 3.8
CM
CM
ABCDEFGHLMNP
118.1
134.3
83.2
83.2
83.2
139.1
139.1
139.1
147.3
147.3
147.3
34 18 31
34 2 18 31
34 2 20 31
3.2
3.2
3.2
3.2
3.8
3.8
DIMENSIONS
19.7
19.7 39.4
19.7
19.1
19.1
19.1
19.1
19.1
19.1
39.4
39.4
47
47
47
47
47
47
43.8
43.8
43.8
47.1
47.1
47.1
112
10.8
114
10.8
114
10.8
4
10.2
10.2
10.2
11.4
11.4
11.4
3.2
4
3.2
4 18
3.2
3.2
3.2
3.2
39.4
41.9
41.9
43.8
43.8
34.9
34.9
34.9
79.1
78.7
78.7
78.7
SHIPPING
WEIGHT
780 Lbs.
431 Kg
431 Kg
1000 Lbs.
488 Kg
11 00 Lbs.
499 Kg
Revised November 2009
July 2011R
www.hotwater.com
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AOSDG25300
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Domestic Hot Water Boilers
SUGGESTED SPECIFICATION
The hot water supply boiler(s) shall be A. O. Smith Dura-Max® model DW ______ with an input rating of ______ BTU/hr and a recovery rating of ________________ BTU/hr at
100°F temperature rise. The boiler(s) shall be design-tested and certified to the ANSI Z21.13 standard, approved by CSA International and shall carry the ASME “H” Symbol. The wet
section shall be design-registered in accordance with the requirements of the ASME Code and shall carry an appropriate National Board Number or Canadian Registration Number.
All waterways shall be copper, brass or bronze. The heat exchanger shall be a two (2)-pass design incorporating integral-finned copper tubes. The double-row heat exchanger
shall have staggered tubes. Cast bronze return bends shall be readily removable to permit visual inspection or cleaning without removing the entire wet section assembly. Silicone
“O”-ring gaskets shall form a water-tight seal by compression and shall be isolated from the flue gases by 3/4” board-type ceramic fiber insulation. The heat exchanger assembly
shall be hydrostatically tested to a pressure of 240 psi (1655 kPa) and shall have a maximum working pressure of 160 psi (1100 kPa).The combustion chamber shall be constructed
of board-type ceramic fiber insulation rated to 2300°F (1260°C) which interlocks to form a gas-tight seal and shall be supported in a heavy-gauge corrugated steel frame. The
external cabinet shall incorporate a built-in draft hood and shall be of baked enamel steel construction. It shall be suitable for installation on combustible flooring. The burners
shall be a stainless steel stamped design and shall be mounted in a removable drawer assembly.The burner controls shall be 24 VAC and shall include slow-opening main gas valve
for soft ignition, redundant safety shutoff gas valve, main and pilot pressure regulators, recycling intermittent pilot system with one-second shutdown in the event of pilot flame
failure, automatic recycling high limit, manual reset ECO limit, main and pilot manual cocks and manual firing valve, and an ASME-rated pressure relief valve. The boiler shall be
approved by Factory Mutual (FM).The boiler shall comply with current edition ASHRAE/IESNA 90.1. Optional: Factory-installed, dial-type temperature and pressure gauges shall
be mounted on the front of the cabinet.
For Technical Information and Automated Fax Service, call 800-527-1953. A.O. Smith Corporation reserves the right to make product changes or improvements without prior notice.
Revised November 2009
July 2011R
www.hotwater.com
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AOSDG25300
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