Page 1
Commercial Electric
Water Heaters
DURA-POWER
™
Designed for use as a recovery heater having its own storage tank. Available in
upright standard models (DEN) and lowboy models (DEL).
GLASSLINED TANK
• Thirteen sizes; 6 thru 119 gallon
capacity. Tank interior is coated with
glass specially designed by A. O. Smith
for water heater use.
CSA CERTIFIED AND ASME RATED
T&P RELIEF VALVE
SIMPLIFIED CIRCUITRY, COLOR
CODED FOR EASE OF SERVICE
ANODE ROD FOR MAXIMUM
ELEMENTS
• Zinc plated copper sheaths for longer
life. Medium watt density means lower
surface temperature to minimize scale
build-up and more surface to heat
water. Element sizes from 1.5 to 6 KW.
Maximum input 12 KW (see chart).
STANDARD VOLTAGES
• 120, 277 single phase and 208, 240
and 480V unbalanced three-phase
delta; easily converted to single-phase at
terminal block (except 208V with 5500
watt elements). Single element heaters,
single-phase only.
TERMINAL BLOCK
• Factory-installed. Just bring the service
to heater and connect to block. Terminal
block not supplied on 120V & 277 volt
models. (No junction box on DEL6-20)
CONTROLS
• Temperature control (adjustable
through a range of 130° to 170°F on
single element and 120° to 181°F on
dual element) and manual reset high
temperature cutoff per element
CORROSION PROTECTION
CABINET HAS BONDERIZED
UNDERCOAT WITH BAKED
ENAMEL FINISH
TOP INLET AND OUTLET OPENINGS
DRAIN VALVE
(EXCLUDES DEL 6-20)
UL APPROVED FIELD CONVERSION
PROGRAM
COMPLIANCE
• Meets the standby loss Requirements
of the U.S. Department of Energy and
current edition of ASHRAE/IES 90.1.
LIMITED WARRANTY OUTLINE
• If the tank should leak any time during
the first three years, under the terms of
the warranty, A. O. Smith will furnish a
replacement heater; installation, labor,
handling and local delivery extra. THIS
OUTLINE IS NOT A WARRANTY. For
complete information consult the written
warranty or A. O. Smith Water Products
Company.
DEN-40
DEL-30
© March 2019 A. O. Smith Corporation. All rights reserved.
www.hotwater.com | 800-527-1953 Toll-Free USA | A. O. Smith Corporation | 500 Tennessee Waltz Parkway | Ashland City, TN 37015
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AOSCE15400
Page 2
Commercial Electric
INLET
3/4” (FEMALE)
OUTLET
3/4” (FEMALE)
DEL 30/40/50
DEN 30-120
INLET
3/4” (FEMALE)
OUTLET
3/4” (FEMALE)
HO
*(NO SIDE OUTLET AVAILABLE FOR DEL-6 MODELS)
ALTERNATE OUTLET
Water Heaters
3/4” (FEMALE) NPT
“B”
FRONT VIEW
DEL 6/10/15/20
“C”
“A”
T WATER OUTLET DEL-6
TOP VIEW
DEL 6/10/15/20
OUTLET
3/4” (FEMALE)
NPT
3/4” NPT
RELIEF VALV E
OPENING
ELECTRICAL
CONNECTION
INLET
3/4” (FEMALE)
NPT
ROUGH-IN DIMENSIONS
Model Number
No. of
Elements
DEL-6 1 6 23 15-1/2 394 14-1/4 362 11 279 N/A N/A 35 15.9
DEL-10 1 10 38 18-1/4 464 18 457 12-1/2 318 N/A N/A 54 24.5
DEL-15 1 15 57 26 660 18 457 20-1/2 521 N/A N/A 58 26.3
DEL-20 1 20 76 22-1/4 565 21-3/4 552 15-3/8 391 N/A N/A 73 33.1
* No side outlet available on DEL-6 Model
Tank Capacity A B C D Shipping Weight
US Gals Litres Inches mm Inches mm Inches mm Inches mm lbs. Kg.
NPT
“D”
NPT
NPT
“D”
NPT
2 1/2”
(63.5 mm)
JUNCTION
BOX
3 3/4” (95.25 mm)
TOP VIEW
DEL 30/40/50
“B”
3/4” NPT
RELIEF VALV E
OPENING
BRASS
DRAIN
VALV E
FRONT VIEW
“C”
JUNCTION
BOX
“A”
DRAIN
VALV E
3 3/4” (95.25 mm)
TOP VIEW
DEN 30 - 120
“B”
FRONT VIEW
3/4” NPT
RELIEF VALV E
OPENING
2 1/2”
(63.5 mm)
“A”
ROUGH-IN DIMENSIONS
Tank Capacity A B C D Shipping Weight
Model
Number
No. of
Elements
DEL-30 2 30 114 30-7/8 784 21-3/4 552 24-1/8 613 8 203 100 45.4
DEL-40 2 40 151 32-1/4 819 24 610 25-9/16 649 8 203 125 56.7
DEL-50 2 50 189 32-1/4 819 26-1/2 673 25-1/8 638 8 203 166 75.3
DEN-30 2 30 114 34-1/2 876 20-1/2 521 21 533 8 203 98 44.5
DEN-40 2 40 151 45-1/8 1146 20-1/2 521 N/A N/A 8 203 113 51.3
DEN-52 2 50 189 54-7/8 1394 20-1/2 521 N/A N/A 8 203 131 59.4
DEN-66 2 66 250 60-3/4 1543 21-3/4 552 N/A N/A 8 203 176 79.8
DEN-80 2 80 303 59-3/8 1508 24 610 N/A N/A 8 203 211 95.7
DEN-120 2 119 450 62-7/16 1586 29-3/8 746 N/A N/A 8 203 326 147.9
US Gals Litres Inches mm Inches mm Inches mm Inches mm lbs. Kg.
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AOSCE15400
Page 3
Commercial Electric
Water Heaters
ELEMENT AVAILABILITY CHART (LIGHT-DUTY COMMERCIAL ELECTRIC)
Models & Elements Voltage Wiring kW Input Available
120V - 1.5 2 2.5 3
208V - 1.5 2 2.5 3
6-Gallon Models
Single-Element
10-Gallon through
20-Gallon Models
Single-Element
30-Gallon through
120-Gallon Models
Double-Element
6 gallon model not available above 3kW
6/10/15/20 gallon models all A6 circuit (2 wire) only
† Exceeds maximum amp draw.
** Simultaneous only in 3ph
240V - 1.5 2 2.5 3
277V - 1.5 2 2.5 3
480V - 2 2.5 3
120V - 1.5 2 2.5 3
208V - 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
240V - 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
277V - 1.5 2 2.5 3 4 4.5 5 6
480V - 2 2.5 3 4 4.5 5 5.5 6
120V
208V
240V
277V*
480V
Interlock 1.5 2 2.5 3
Simultaneous 3 4 5 †
Interlock 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
Simultaneous 3 4 5 6 7 8 9 10** 11** †
Interlock 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
Simultaneous 3 4 5 6 7 8 9 10 11 12**
Interlock 1.5 2 2.5 3 4 4.5 5 6
Simultaneous 3 4 5 6 8 9 10 12
Interlock 2 2.5 3 4 4.5 5 5.5 6
Simultaneous 4 5 6 8 9 10 11 12
ELECTRIC CHARACTERISTICS
Electric Characteristics
Non Simultaneous and Single Element Operation
Element
Wattage
Upper /
Lower
1500 7.2 6.3 3.2 1500/1500 14.4 12.5 6.3 1500/1500 12.4/7.2 10.8/6.3 5.4/3.2
2000 9.6 8.3 4.2 2000/2000 19.2 16.6 8.3 2000/2000 16.6/9.6 14.4/8.3 7.2/4.2
2500 12.0 10.4 5.2 2500/2500 24 20.8 10.4 2500/2500 20.8/12.0 18.0/10.4 9.0/5.2
3000/3000 14.4 12.5 6.3 3000/3000 28.8 25 12.5 3000/3000 25.0/14.4 21.6/12.5 10.8/6.3
4000/4000 19.2 16.7 8.3 4000/4000 38.4 33.3 16.6 4000/4000 33.3/19.2 28.8/16.7 14.4/8.3
4500/4500 21.6 18.8 9.4 4500/4500 43.2 37.5 18.75 4500/4500 37.4/21.6 32.4/18.8 16.2/9.4
5000/5000 24.0 20.8 10.4 5000/5000 NA 41.6 20.8 5000/5000 41.6/24.0 36.0/20.8 18.0/10.4
6000/6000 28.8 25.0 12.5 6000/6000 NA NA 25 6000/6000 NA 43.3/25.0 21.6/12.5
6 - 120 Gallon
Full Load Current in Amperes
(Terminals - L1, L2)
208V 240V 480V
Simultaneous Dual Element Operation
(Single Phase Connection)
30 - 120 Gallon
Element
Wattage
Upper /
Lower
Full Load Current in Amperes
(Terminals - L1, L2)
208V 240V 480V
Simultaneous Dual Element Operation
(Unbalanced Three Phase connection)
Element
Wattage
Upper /
Lower
30 - 120 Gallon
Full Load Current in Amperes
(Terminals - L1/Terminal L2 & L3)
208V 240V 480V
AOSCE15400
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Page 4
RECOVERY CAPACITIES
Commercial Electric
Water Heaters
Element
Wattage
(Upper/
Lower)
Non-Simulataneous Operation
/1500 1.5
/2000 2
/2500 2.5
3000/3000 3
4000/4000 4
4500/4500 4.5
5000/5000 5
6000/6000 6
Simulataneous Operation
3000/3000 6
4000/4000 8
4500/4500 9
5000/5000 10
6000/6000 12
Recovery capacities at 100° F rise equal: for non-simultaneous element operation = 4.1 gal. x kW of one element; for simultaneous element operation = 4.1 gal. x 2/3 kW of both elements.
For other rises multiply element kW as previously explained by 410 and divide by temperature rise. Full load current for single phase = total watts/voltage.
Input
kW C° 20 22.2 30 33.3 40 44.4 50 55.5 60 66.6 70
F° 36 40 54 60 72 80 90 100 108 120 126
GPH 17 15 11 10 8 8 7 6 6 5 5
LPH 64 58 43 38 32 29 26 23 21 19 18
GPH 23 20 15 14 11 10 9 8 8 7 6
LPH 85 77 57 51 43 38 34 31 28 26 24
GPH 28 25 19 17 14 13 11 10 9 8 8
LPH 107 96 71 64 53 48 43 38 36 32 30
GPH 34 30 23 20 17 15 14 12 11 10 10
LPH 128 115 85 77 64 58 51 46 43 38 37
GPH 45 41 30 27 23 20 18 16 15 14 13
LPH 170 153 114 102 85 77 68 61 57 51 49
GPH 51 46 34 30 25 23 20 18 17 15 14
LPH 192 173 128 115 96 86 77 69 64 58 55
GPH 56 51 38 34 28 25 23 20 19 17 16
LPH 213 192 142 128 107 96 85 77 71 64 61
GPH 68 61 45 41 34 30 27 24 23 20 19
LPH 256 230 170 153 128 115 102 92 85 77 73
GPH 68 61 45 41 34 30 27 24 23 20 19
LPH 256 230 170 153 128 115 102 92 85 77 73
GPH 90 81 60 54 45 41 36 32 30 27 26
LPH 341 307 227 205 170 153 136 123 114 102 97
GPH 101 91 68 61 51 46 41 36 34 30 29
LPH 384 345 256 230 192 173 153 138 128 115 110
GPH 113 101 75 68 56 51 45 41 38 34 32
LPH 426 384 284 256 213 192 170 153 142 128 122
GPH 135 122 90 81 68 61 54 49 45 41 39
LPH 511 460 341 307 256 230 205 184 170 153 146
U. S. Gallons/Hr and Litres/Hr at Temperature Rise Indicated
SPECIFICATION
The water heaters(s) shall be Dura-Power™ Model(s) No. ______ as manufactured by A. O. SMITH or an approved equal. Heater(s) shall be rated at
_____kW, _____volts, _____-phase, 60 cycle AC, and listed by Underwriters’ Laboratories. Models shall meet the standby loss requirements of the U.S.
Department of energy and current edition of ASHRAE/IES 90.1. Tank(s) shall be _____gallon capacity. Heater(s) shall have 150 psi working pressure and
be equipped with extruded high density anode rod. All internal surfaces of the heater(s) exposed to water shall be glasslined with an alkaline borosilicate
composition that has been fused-to-steel by firing at a temperature range of 1400°F to 1600°F. Electric heating elements shall be medium watt density
with zinc plated copper sheath. Each element shall be controlled by an individually mounted thermostat and high temperature cutoff switch. The outer
jacket shall be of backed enamel finish and shall enclose the tank with foam insulation. Electrical junction box with heavy duty terminal block shall be
provided (except on 120V & 277V {no junction box on DEL-6 thru 20}). The drain valve shall be located in the front for ease of servicing. Heater tank shall
have a three year limited warranty as outlined in the written warranty. Fully illustrated instruction manual to be included.
For technical information, call 800-527-1953. A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice.
© March 2019 A. O. Smith Corporation. All rights reserved.
www.hotwater.com | 800-527-1953 Toll-Free USA | A. O. Smith Corporation | 500 Tennessee Waltz Parkway | Ashland City, TN 37015
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AOSCE15400
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