Commercial Electric Water Heaters
dura-power
180°f booster models
MODELs
cMc/su-6
through
Dura-Power® commercial electric water heaters are designed to boost the water temperatures
for applications such as commercial dishwashers, which require very high temperature sanitizing
rinse—typically 180°F. Both 5-gallon countermount “CMC” models and 20-gallon “SU” models are
available with inputs up to 54 kW. Are models are also available with an optional stainless steel
tank for use with deionized water.
cMc/su-54
features
INColoY-sHeatH HeatING elemeNts staNdard
Industrial-grade Incoloy sheathed heating elements are designed for rugged long-
lasting commercial service and can withstand sheath temperatures up to 1500°F
Each heating element has three separate heating loops, which provides more heating
surface, lower watt density and maximum recovery efficiency
Pre-wired leads provide excellent protection against oxidation and scaling
Input options from 6 kW to 54 kW, recoveries from 25 to 221 gallons per hour (gph)
at 100°F rise
Deionized models equipped with stainless steel standard elements
a. o. smItH GoldeNrod elemeNts optIoNal
Patent-pending 24k gold-plated sheath plus medium watt-density ensures even
longer element life
Higher resistance to scale build-up, compared to Incoloy elements
Three-year warranty against failure due to lime scale build-up
Not available on deionized models
staNdard VoltaGes for easY INstallatIoN
Single-phase and three-phase
Single-phase 208V and 240V are field-convertible to three-phase
CMC models only, 208V and 240V at 24 kW and below are supplied as phase-convertible units
(single- to three-phase and vice versa)
277V single-phase also available – Contact A. O. Smith for 120V circuit availability
ImmersIoN tHermostat for effICIeNt CoNtrol
(Optional)
Close-differential, immersion-type thermostat for superbly accurate temperature control
Adjustable from 140°F to 185°F
Manual reset, high-temperature cutoff
HeaVY-dutY maGNetIC CoNtaCtors
UL-rated 100,000 cycles
Certified to NSF/ANSI 61
faCtorY-wIred, 120V CIrCuIt CoNtrols
120V control circuit powered by fused transformer
Eliminates need for 120V service connection
PG 1 OF 4
Revised October 2008
AOSCE15700
Commercial Electric Water Heaters
power-CIrCuIt fusING for sYstem proteCtIoN
Safeguards elements and contactors from short circuits, overloading and line surges
Required by National Electric Code and UL when current draw exceeds 120 A
all staINless steel JaCKet
Cleans easily, corrosion resistant, hinged for easy serviceability
Standard on CMC models, optional on SU models
GLASS-LINED TANK, ASME TANK CONSTRUCTION
Specifically developed for high-temperature water heater use
Provides long-lasting protection against corrosion
Equipped with anode rod for additional corrosion protection
Stainless steel tank on deionized models
maXImum HYdrostatIC worKING pressure: 150 psI
faCtorY-INstalled temperature & pressure relIef ValVe meets asHrae/IesNa 90.1
tHree-Year lImIted taNK warraNtY
For complete information, consult written warranty or contact A. O. Smith
otHer dura-power CmC aNd su serIes staNdard features:
SIMPLIFIED, COLOR-CODED CIRCUITRY FOR EASE OF SERVICE
ASME T & P RELIEF VALVE
PRESSURE REDUCING VALVE WITH BYPASS CHECK AND STRAINER
TEMPERATURE/PRESSURE GAUGES
otHer dura-power CmC aNd su serIes optIoNs:
STAINLESS STEEL TANK
• For deionized water
LOW-WATER CUTOFF
• Probe-type electric low-water cutoff
• Prevents energizing of elements when low-water condition exists (automatic reset)
UNDERCOUNTER MOUNTING PAN FOR CMC MODELS
DUAL INDICATING/PILOT LIGHTS AND SWITCH
• Lights indicate when elements are on, switch gives positive on-off control of control circuit
SHOCK ABSORBER REDUCES WATER HAMMER
Revised October 2008
PG 2 OF 4
AOSCE15700
Commercial Electric Water Heaters
INput CapaCItY aNd reCoVerY
CmC models
reCoVerY–GalloNs or lItres per Hour at
GpH
model
staNdard Kw
INput
deGree rIse*
or
Number
40°f
22°C
62
100°f
56°C
25
140°f
78°C
18
lpH
CMC-6
SU-6
CMC-6
SU-6
CMC-6
SU-6
CMC-6
SU-6
CMC-6
SU-6
CMC-6
SU-6
CMC-6
SU-6
CMC-6
SU-6
GPH
LPH
GPH
LPH
GPH
LPH
GPH
LPH
GPH
LPH
GPH
LPH
GPH
LPH
GPH
LPH
GPH
LPH
GPH
LPH
GPH
LPH
6
234.7
92
94.6
37
68.1
26
9
348.2
123
140
98.4
35
49
12
15
18
20
24
30
36
45
54
465.6
154
185.5
61
132.5
44
582.9
184
230.9
74
166.5
53
696.4
205
280.1
82
200.6
58
775.9
246
310.4
98
219.5
70
931.1
307
370.9
123
265
88
1162
369
465.6
148
333.1
105
397.4
132
499.6
158
598
CMC-6
SU-6
CMC-6
SU-6
CMC-6
SU-6
1396.7
461
560.2
184
1744.9
554
696.4
221
2096.9
836.5
For deionized water models with stainless steel tanks, add “D” to model number.
Examples CMCD-6, SUD-6. NSF recovery ratings = above ratings x .98.
su models
dImeNsIoNs aNd weIGHt
sHIppING
weIGHt
dImeNsIoNs IN INCHes
model
Number
GalloNs or
lItres
CapaCItY
HeIGHt a
wIdtH b
deptH C
INlet/outlet staNdard
CMC-6
through
CMC-18
U.S. Gallons
Litres
13.75
13
23.5
3/4
80 lbs.
5
5
34.9
12
33
18
55.2
23.5
57.2
1.91
36.4 kg
U.S. Gallons
Litres
3/4
96 lbs.
CMC-20
through
CMC-54
30.5
45.7
1.91
43.6 kg
CMC-6
through
CMC-54
U.S. Gallons
Litres
25
22.25
56.5
23
3/4
200 lbs.
90.9 kg
20
63.5
58.4
1.91
wattaGe aNd VoltaGe
aVaIlable model
full load CurreNt IN amperes
sINGle pHase
Number of
ImmersIoN
Heaters
ImmersIoN
Heater
wattaGe
Kw INput
tHree pHase
240V
14.4
CmC serIes
su serIes
208V
28.8
43.3
57.7
72.1
240V
25
37.5
50
62.5
75
83.3
100
125
150
187.5
225
277V
21.7
32.5
43.3
54.2
65
72.2
86.6
108.3
130
480V
12.5
18.8
25
31.3
37.5
41.7
50
208V
16.7
25
33.3
41.6
50
55.5
66.6
83.3
99.9
124.9
149.9
480V
7.2
6
CMC-6
CMC-9
SU-6
SU-9
1
1
1
1
1*
2
2
2
2
3
3
6,000
9,000
9
21.7
28.9
36.1
43.3
48.1
57.7
72.2
86.6
10.8
14.4
18
21.7
24.1
28.9
36.1
43.3
54.1
65
12
15
18
20
24
30
36
45
54
CMC-12
CMC-15
CMC-18
CMC-20
CMC-24
CMC-30
CMC-36
CMC-54
CMC-54
SU-12
SU-15
SU-18
SU-20
SU-24
SU-30
SU-36
SU-45
SU-54
12,000
15,000
18,000
10,000
12,000
15,000
18,000
15,000
18,000
86.5
96.2
115.4
144.2
173.1
216.3
N/A
62.5
75
162.5
194.9
93.8
112.5
108.3
129.9
*208V models use on additional immersion heater
**Each immersion heater contains three electric elements
Revised October 2008
PG 3 OF 4
AOSCE15700
Commercial Electric Water Heaters
suGGested speCIfICatIoN
The water heater(s) shall be A. O. Smith Dura-Power Model(s) CMC/SU _____ rated at _____ KW, _____ volts, _____ -phase, 50/60 cycle AC, and constructed in
accordance with ASME Code and shall bear appropriate symbol and be listed with the National Board as required. Heater shall be listed with Underwriters
Laboratories and approved by National Sanitation Foundation.
Glass-lined tank(s) shall be _____ gallon capacity with 150 psi maximum working pressure/ASME Code. Tank shall be cathodically protected with adequate
extruded magnesium rod. All internal surfaces of the heater(s) exposed to water shall be glass-lined with an alkaline borosilicate composition fused to
steel. For deionized, substitute: Stainless tank(s) shall be _____ gallon capacity with 150 psi working pressure/ASME Code.
Elements shall be commercial-grade, medium watt density, triple-loop construction Incoloy sheathed or Goldenrod elements __________. For deionized,
substitute: Elements shall be commercial-grade, type 316 L stainless steel sheathed. Elements shall be switched through magnetic contactor(s). Fused 120V
control circuit shall include manual reset, high-temperature cut-off switch and immersion-style operating thermostat(s). Low-water cut-off (optional) to
prevent element burnout due to possible low-water conditions. Straight-line rectangular cabinet shall be baked enamel with stainless steel front panel
(SU models only). All stainless steel jacket (CMC models only) shall provide full-size access to control and elements for ease in servicing and shall enclose
tank with fiber-class insulation.
Heater tank shall have a three (3) year limited warranty as outlined in the written warranty.
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 October 2008
PG 4 OF 4
AOSCE15700
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