COMMERCIAL ELECTRIC
WATER HEATERS
DRE-52, 80, 120
Designed for use as a recovery heater having its own
storage tank. Note: Not recommended for sanitizing
water application.
Meets or exceeds the requirements of ASHRAE 90.1b-
1992 Standard for energy efficiencies.
FEATURES
GLASS-LINED TANK - Three sizes; 52, 80 and 119 gallon
(189, 300, 450 Liter) capacity. Tank interior is coated with
glass specially developed by A.O. Smith Ceramic Research
for water heater use. Tanks rated at 150 psi (1034 kPa)
working pressure (ASME 160 psi [1100 kPa]). Foam
insulation reduces costly heat loss, and is vermin proof.
ELEMENTS - Incoloy sheathing for longer life. Low watt
density; means lower surface temperature to minimize scale
buildup and more surface to heat water. Element sizes from
3 to 6 Kw. Use 3, 6 or 9 elements standard; total of 6 to 54
Kw input (see chart on back).
STANDARD VOLTAGES - 208, 240 and 480V single-phase
and three-phase delta; 277V single-phase also available.
TERMINAL BLOCK - Factory installed. Just bring the service
to the heater and connect to block.
CONTROLS - One temperature control adjustable through a
range of 120° to 180°F (49° to 82°C) and manual reset high
temperature cutoff per element. Thermostat step control may
be achieved by varying settings on individual temperature
controls. Located behind hinged control compartment door
for quick, easy access.
OTHER STANDARD FEATURES
• Simplified circuitry, color coded for ease of service • Two
anode rods for maximum corrosion protection • Cabinet has
bonderized undercoat with baked enamel finish • Bottom
inlet and top outlet openings • Brass drain valve • C.G.A./
ASME temperature and pressure relief valve • Single panel
control box.
ASME
(OPTIONAL)
LIMITED WARRANTY OUTLINE
OPTIONAL
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.
FUSING - Protects all elements, thermostats, and internal
wiring circuits against excess current flow. Meets Canadian
Electric Code requirements.
Manifold kits with gate valves - available for multiple
installation.
For complete information, consult the written warranty
or A. O. Smith Water Products Company.
ASME 160 psi tank construction.
GOLDENROD ELEMENTS - All DRE models are available with the Goldenrod 24K gold plated elements (patent pending).
Goldenrod elements provide long life and 6 times the scaling resistance of standard incoloy elements. Goldenrod elements
carry a three-year warranty against failure due to scale.
Revised June 2001
A 211.0C
RECOVERY CAPACITY IN GALLONS AT TEMPERATURE RISE OF
Standard
kW Input
6
BTU/
Hour
20,478
30°F 40°F 50°F 60°F 70°F 80°F 90°F 100°F 110°F 120°F 130°F 140°F
17°C 22°C 28°C 33°C 39°C 45°C 50°C 56°C 61°C 67°C 72°C 78°C
82
310
123
465
164
620
184
698
205
775
246
930
328
1241
369
62
233
92
49
166
74
279
98
41
155
62
233
82
35
133
53
199
70
266
79
299
88
332
105
399
140
532
158
509
176
665
211
798
237
897
263
997
316
31
116 103
46 41
174 155
61 55
233 207
69 62
262 233
77 68
291 258
92 82
349 310
123 109
465 414
138 123
523 465
154 137
582 517
184 164
698 620
208 185
785 698
230 205
872 755
277 246
27
25
93
37
140
49
186
55
209
61
233
74
279
98
372
111
410
123
465
148
556
166
628
184
698
221
837
22
85
34
127
45
169
50
190
56
211
67
254
90
338
101
391
112
423
134
508
151
634
168
634
201
761
21
78
31
116
41
155
46
174
51
194
62
233
82
310
92
19
72
28
107
38
143
43
161
47
149
57
215
76
286
85
18
66
26
100
35
133
40
150
44
166
53
199
70
266
79
9
12
30,717
40,956
46,075
51,195
61,434
81,912
92,151
102,390
122,868
138,226
153,585
184,302
349
123
465
138
523
154
582
184
698
246
930
276
372
111
419
123
465
148
558
197
744
221
938
246
930
295
310
92
13.5
15
349
102
388
123
465
164
620
185
609
205
775
246
930
277
18
24
27
1396 1047
410 307
1551 1163
492 369
1861 1396 1117
554 418 332
2094 1570 1256 1047
615 461 369 307
2326 1745 1398 1163
738 554 443 359
340
102
388
123
465
138
582
154
582
185
696
322
95
299
88
30
358
113
429
128
537
142
537
170
644
332
105
399
119
498
132
498
158
598
36
40.5
45
54
2791 2094 1675 1396 1196 1047 930
Figured at 1 KW (3413 BTU) = 4.1 Gallons at 100°F temperature rise.
NSF ratings may be obtained by multiplying the above figures by 0.98.
Tank
Capacity
Dimensions
B
Inlet/
Outlet (NPT)
Approx. Ship.
Wt. (Lbs.)
Model
A
C
Number
DRE-52
DRE-80
DRE-120
gal.
50
80
litre
189
300
450
in.
cm
in.
cm
55.2
64.1
75.0
in.
cm
in.
cm
3.2
3.2
3.2
lb
kg
55 1/4
59 1/2
62 1/4
140.3
151.1
158.1
21 3/4
25 1/4
29 1/2
27 1/4
31 1/4
35 3/4
69.2 1 1/4
79.4 1 1/4
90.8 1 1/4
265
280
390
120
127
177
119
Model Numbers
Tank Capacity in Gallons
80
Number
Full Load Current In Amperes
Single Phase
KW
Input
6
Of
Elements
3
Element
Three Phase
240V
50
119
Wattage
2,000
3,000
4,000
4,500
5,000
6,000
4,000
4,500
5,000
6,000
4,500
5,000
6,000
208V
28.8
240V
277V
480V
12.5
18.8
25.0
28.1
31.3
37.5
50.0
56.3
62.5
75.0
84.4
93.8
112.5
208V
16.7
25.0
33.3
37.5
41.6
50.0
66.6
74.9
83.3
99.9
112.4
124.9
149.9
480V
7.2
DRE-52-6
DRE-80-6
DRE-120-6
25.0
21.7
14.4
9
12
DRE-52-9
DRE-80-9
DRE-120-9
3
3
43.3
37.5
32.5
21.7
28.9
32.5
36.1
43.3
57.7
65.0
72.2
86.6
97.4
108.3
129.9
10.8
14.4
16.2
18.0
21.7
28.9
32.5
36.1
43.3
48.7
54.1
65.0
DRE-52-12
DRE-52-13.5
DRE-52-15
DRE-52-18
DRE-52-24
DRE-52-27
DRE-52-30
DRE-52-36
DRE-52-40.5
DRE-52-45
DRE-52-54
DRE-80-12
DRE-80-13.5
DRE-80-15
DRE-80-18
DRE-80-24
DRE-80-27
DRE-80-30
DRE-80-36
DRE-80-40.5
DRE-80-45
DRE-80-54
DRE-120-12
DRE-120-13.5
DRE-120-15
DRE-120-18
DRE-120-24
DRE-120-27
DRE-120-30
DRE-120-36
DRE-120-40.5
DRE-120-45
DRE-120-54
57.7
50.0
43.3
13.5
15
3
64.9
56.3
48.7
3
72.1
62.5
54.2
18
3*
6
86.5
75.0
65.0
24
115.4
129.8
144.2
173.1
194.7
216.3
N/A
100.0
112.5
125.0
150.0
168.8
187.5
225.0
86.6
27
6
97.5
30
6
108.3
130.0
146.2
162.5
194.9
36
6*
9
40.5
45
9
54
9
*208 volt models may contain three (3) additional elements.
SUGGESTED SPECIFICATIONS
The heater(s) shall be Dura-Power Commercial Electric Model Number _______________ as manufactured by A.O. Smith Water Products Company
or equivalent. Heater(s) shall be rated at ______________ KW ________ V _____________ phase, 60 cycle AC listed by Canadian Standards
Association. Tank(s) shall be ________ gallon (Liter) capacity. Heater(s) shall have 150 psi (1034 kPa) working pressure and be equipped with
extruded high density anode. All internal surfaces of the heater(s) exposed to water shall be glass-lined with an alkaline borosilicate composition
that has been fused to steel by firing at a temperature range of 1400°F to 1600°F (760° to 870°C). Electric heating elements shall be low watt density
with incoloy sheath and 1" screw-in type. Each element shall be controlled by an individually mounted thermostat and high temperature cut-off
switch. All internal circuits shall be fused (optional). The outer jacket shall be of baked enamel finish and shall be provided with full size control
compartment for performance of service and maintenance through hinged front panel and shall enclose the tank with vermin proof foam insulation.
Electrical junction box with heavy duty terminal block shall be provided. 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. Manufacturer shall supply ASME rated temperature and pressure
relief valve. Fully illustrated instruction manual to be included.
A. O. Smith Enterprises Ltd.
A Division of A. O. Smith Corporation El Paso, Texas
Stratford, Ontario Seattle, Washington
Veldhoven, The Netherlands
McBee, South Carolina
A.O. Smith Water Products Co., Inc. On Line
For Technical Information
Phone: 800-265-8520
A. O. Smith Corporation reserves the right to make product changes
or improvements at any time without notice.
Printed in U.S.A.
© A. O. Smith Corp., 2001
A 212.0C
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