A.O. Smith DB/DW-720-1810 warranty Pressure Drop

Page 4

WARNING

Your Dura-Max boiler is not designed to operate with a boiler inlet water temperature of less than 100°F (38°C). Colder inlet water temperatures will result in significant condensation developing on the heat exchanger. This situation can cause a corrosive environment for the heat exchanger, burners and venting resulting in premature damage, which could result in serious personal injury or death.

For systems that use large volumes of cold water or system utilizing heavy water draws (Cer-Temp), condensation can be prevented by using a by-pass loop. See page 16.

 

 

 

 

 

 

TABLE 2, PRESSURE DROP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Model

 

Temp Rise

 

 

Flow Rate

HdLoss*

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

F

 

C

 

GPM

LPM

ft

M

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20

 

11.1

 

 

59

 

223

3.5

1.1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DW-720

 

30

 

16.7

 

 

39

 

149

1.7

0.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

 

22.2

 

 

29

 

111

1.0

0.3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20

 

11.1

 

 

69

 

260

4.8

1.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DW-840

 

30

 

16.7

 

 

46

 

173

2.1

0.6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

 

22.2

 

 

34

 

130

1.5

0.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20

 

11.1

 

 

79

 

297

6.8

2.1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DW-960

 

30

 

16.7

 

 

52

 

198

3.3

1.0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

 

22.2

 

 

39

 

149

1.9

0.6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20

 

11.1

 

 

89

 

339

4.5

1.4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DW-1080

 

30

 

16.7

 

 

60

 

226

2.1

0.6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

 

22.2

 

 

45

 

169

1.4

0.4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20

 

11.1

 

 

100

 

379

5.3

1.6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DW-1210

 

30

 

16.7

 

 

67

 

253

2.7

0.8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

 

22.2

 

 

50

 

190

1.6

0.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20

 

11.1

 

 

112

 

423

6.8

2.1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DW-1350

 

30

 

16.7

 

 

75

 

282

3.2

1.0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

 

22.2

 

 

56

 

212

1.8

0.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20

 

11.1

 

 

120

 

453

7.9

2.4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DW-1480

 

30

 

16.7

 

 

80

 

302

3.9

1.2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

 

22.2

 

 

60

 

226

2.1

0.6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20

 

11.1

 

 

130

 

492

9.5

2.9

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DW-1610

 

30

 

16.7

 

 

87

 

328

5.0

1.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

 

22.2

 

 

65

 

246

3.0

0.9

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20

 

11.1

 

 

146

 

554

12.0

3.7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DW-1810

 

30

 

16.7

 

 

98

 

369

6.2

1.9

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

 

22.2

 

 

73

 

277

3.9

1.2

 

 

 

 

 

 

 

 

TABLE 3, RECOVERY CAPACITIES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

U.S. Gallons/Hr and Litres/Hr at TEMPERATURE RISE INDICATED

 

 

 

 

 

 

 

 

 

INPUT

F

20F

30F

36F

40F

 

50F

54F

60F

 

 

70F

72F

80F

90F

 

100F

108F

110F

120F

126F

130F

140F

MODEL

BTUH

KW

C

11.1C

16.6C

20C

22.2C

27.7C

30C

33.3C

 

38.8C

40C

44.4C

50C

55.5C

60C

61.1C

66.6C

70C

72.2C

77.7C

DB/DW-720

720,000

 

GPH

3,535

2,356

1,964

1,767

1,414

1,309

1,178

 

1,010

982

884

785

707

655

643

589

561

544

505

 

211

LPH

13,379

8,920

7,433

6,690

5,352

4,955

4,460

 

3,823

3,716

3,345

2,973

2,676

2,478

2,433

2,230

2,124

2,058

1,911

 

 

 

DB/DW-840

840,000

 

GPH

4,124

2,749

2,291

2,062

1,649

1,527

1,375

 

1,178

1,145

1,031

916

825

764

750

687

655

634

589

 

246

LPH

15,609

10,406

8,672

7,805

6,244

5,781

5,203

 

4,460

4,336

3,902

3,469

3,122

2,891

2,838

2,602

2,478

2,401

2,230

 

 

 

DB/DW-960

960,000

 

GPH

4,713

3,142

2,618

2,356

1,885

1,745

1,571

 

1,346

1,309

1,178

1,047

943

873

857

785

748

725

673

 

281

LPH

17,839

11,893

9,911

8,920

7,136

6,607

5,946

 

5,097

4,955

4,460

3,964

3,568

3,304

3,243

2,973

2,832

2,744

2,548

 

 

 

DB/DW-1080

1,080,000

 

GPH

5,367

3,578

2,982

2,684

2,147

1,988

1,789

 

1,534

1,491

1,342

1,193

1,073

994

976

895

852

826

767

 

316

LPH

20,317

13,545

11,287

10,158

8,127

7,525

6,772

 

5,805

5,644

5,079

4,515

4,063

3,762

3,694

3,386

3,225

3,126

2,902

 

 

 

DB/DW-1210

1,210,000

 

GPH

6,013

4,009

3,341

3,007

2,405

2,227

2,004

 

1,718

1,670

1,503

1,336

1,203

1,114

1,093

1,002

954

925

859

 

354

LPH

22,762

15,175

12,646

11,381

9,105

8,430

7,587

 

6,504

6,323

5,691

5,058

4,552

4,215

4,139

3,794

3,613

3,502

3,252

 

 

 

DB/DW-1350

1,350,000

 

GPH

6,709

4,473

3,727

3,355

2,684

2,485

2,236

 

1,917

1,864

1,677

1,491

1,342

1,242

1,220

1,118

1,065

1,032

958

 

395

LPH

25,396

16,931

14,109

12,698

10,158

9,406

8,465

 

7,256

7,054

6,349

5,644

5,079

4,703

4,617

4,233

4,031

3,907

3,628

 

 

 

DB/DW-1480

1,480,000

 

GPH

7,176

4,784

3,987

3,588

2,870

2,658

2,392

 

2,050

1,993

1,794

1,595

1,435

1,329

1,305

1,196

1,139

1,104

1,025

 

433

LPH

27,162

18,108

15,090

13,581

10,865

10,060

9,054

 

7,761

7,545

6,791

6,036

5,432

5,030

4,939

4,527

4,311

4,179

3,880

 

 

 

DB/DW-1610

1,610,000

 

GPH

7,806

5,204

4,337

3,903

3,122

2,891

2,602

 

2,230

2,168

1,952

1,735

1,561

1,446

1,419

1,301

1,239

1,201

1,115

 

472

LPH

29,548

19,699

16,416

14,774

11,819

10,944

9,849

 

8,442

8,208

7,387

6,566

5,910

5,472

5,372

4,925

4,690

4,546

4,221

 

 

 

DB/DW-1810

1,810,000

 

GPH

8,776

5,851

4,875

4,388

3,510

3,250

2,925

 

2,507

2,438

2,194

1,950

1,755

1,625

1,596

1,463

1,393

1,350

1,254

 

530

LPH

33,219

22,146

18,455

16,609

13,288

12,303

11,073

9,491

9,227

8,305

7,382

6,644

6,152

6,040

5,536

5,273

5,111

4,746

 

 

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Contents Installation Operation Maintenance Limited Warranty TM Models DB/DW-720-1810Replacement Parts ContentsForeword Installation Clearances ROUGH-IN Dimensions CapacitiesLevelling Pressure Drop Features Safety Relief ValvesManual Reset High Temperature Safety Limit Control Electronic Intermittent Pilot Ignition ControlAutomatic Reset High Temperature Limit Control Safety Flow SwitchThermal Balancer Dual Stage Models only HIGH/LOW OperatorInstallation Instructions Required AbilityLocation AIR RequirementsDraft Hood Venting the BoilerVent Connection Connecting Boiler to a Common Vent GAS ConnectionsPurging Correct GASHigh Altitude Installations Wiring ConnectionsConventional Installations ExampleSystems Equipment Installation Circulating Pump Circulating Pump Must be Properly Sized for Your ApplicationSystem Installation Tank Temperature ControlConventional Space Heating Installation LOW Water CutoffDB Installation Installation AS Boiler ReplacementPage LINEAR-TEMP Space Heating Installations LINEAR-TEMP Space Heating ApplicationsDuraMax Pump Performance Requirements Safety Flow Switch Thermometer Pressure GaugeONE Boiler LINEAR-TEMP System Page Page Page Page Page Page Hard Water Conditions ONE DURA-MAX Model DW Commercial Boiler with Vertical TankONE DURA-MAX Model DW Commercial Boiler with Horizontal Tank NPT NPT Manifolding of Model TJV-120M & TJV-200M Tanks START-UP and Operating Instructions For Your Safety Read Before Operating Precautions Checking and Adjusting the InputInternal Contaminants Pilot BurnerPRE-TROUBLE-SHOOTING TROUBLE-SHOOTINGNo Spark AT Pilot Burner YESSpark AT Pilot Burner but Pilot will not Light Pilot Burner Lights but Main Burner does not Light General Maintenance Venting MaintenanceHeat Exchanger Preventive Maintenance Relief ValveDeliming Solvents Removing Light Deposits of ScaleMechanical Removal of Deposits Removal of AN Existing Boiler from a Common Venting SystemDURA-MAX Limited Warranty Page Page Replacement Parts

DB/DW-720-1810 specifications

A.O. Smith has a longstanding reputation for quality and innovation in the water heater industry, and the DB/DW-720-1810 model exemplifies these values. This particular water heater is designed to provide reliable hot water, making it suitable for both residential and commercial applications. Its impressive features and cutting-edge technologies set it apart from conventional models.

One of the primary features of the A.O. Smith DB/DW-720-1810 is its energy efficiency. It operates using advanced insulation technologies, minimizing heat loss and promoting energy savings. This model is designed with a high-efficiency burner that substantially reduces energy consumption while maintaining optimal performance. It also complies with industry standards for energy efficiency, ensuring that users can enjoy lower utility bills without sacrificing comfort.

The DB/DW-720-1810 is equipped with a robust tank designed to hold an ample supply of hot water. With a capacity of 75 gallons, it is ideal for households with high demand, such as multi-bathroom residences or commercial establishments. This large capacity ensures that hot water is readily available for various activities, from bathing to cleaning.

User control is another notable characteristic of the A.O. Smith DB/DW-720-1810. The model features an intuitive digital display that allows users to monitor and set water temperatures easily. This interface not only enhances usability but also promotes safety, preventing scalding by allowing users to adjust the temperature to their preference.

Durability is a key consideration in the DB/DW-720-1810’s design. It is built with high-quality materials and features a corrosion-resistant tank, ensuring longevity even in challenging water conditions. This resilience is further supplemented by A.O. Smith's advanced anode rod technology, which helps battle corrosion and extends the lifespan of the water heater.

Lastly, maintenance is simplified with this model. A.O. Smith has designed the water heater for easy access to serviceable parts, making routine maintenance more convenient and less time-consuming. Coupled with warranty options that provide peace of mind, the DB/DW-720-1810 stands out as a dependable choice.

In summary, the A.O. Smith DB/DW-720-1810 combines energy efficiency, significant capacity, user-friendly controls, durability, and low maintenance needs, making it an exceptional option for those needing a reliable hot water solution.
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