DURA-POWER
Commercial Electric Water Heaters
180°F BOOSTER MODELS
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.
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
MODELS
CMC/SU-6
through
CMC/SU-54
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
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
FACTORY-WIRED, 120V CIRCUIT CONTROLS
120V control circuit powered by fused transformer
Eliminates need for 120V service connection
(Optional)
Certified to NSF/ANSI 61
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
• Fordeionizedwater
LOW-WATER CUTOFF
• Probe-typeelectriclow-watercutoff
• Preventsenergizingofelementswhenlow-waterconditionexists(automaticreset)
UNDERCOUNTER MOUNTING PAN FOR CMC MODELS
DUAL INDICATING/PILOT LIGHTS AND SWITCH
• Lightsindicatewhenelementsareon,switchgivespositiveon-offcontrolofcontrolcircuit
SHOCK ABSORBER REDUCES WATER HAMMER
Revised October 2008 PG 2 OF 4
www.hotwater.com
AOSCE15700
Commercial Electric Water Heaters
INPUT CAPACITY AND RECOVERY
MODEL
NUMBER
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
CMC-6
SU-6
CMC-6
SU-6
CMC-6
SU-6
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.
STANDARD KW
INPUT
6
9
12
15
18
20
24
30
36
45
54
GPH
OR
LPH
GPH 62 25 18
LPH 234.7 94.6 68.1
GPH 92 37 26
LPH 348.2 140 98.4
GPH 123 49 35
LPH 465.6 185.5 132.5
GPH 154 61 44
LPH 582.9 230.9 166.5
GPH 184 74 53
LPH 696.4 280.1 200.6
GPH 205 82 58
LPH 775.9 310.4 219.5
GPH 246 98 70
LPH 931.1 370.9 265
GPH 307 123 88
LPH 1162 465.6 333.1
GPH 369 148 105
LPH 1396.7 560.2 397.4
GPH 461 184 132
LPH 1744.9 696.4 499.6
GPH 554 221 158
LPH 2096.9 836.5 598
RECOVERY–GALLONS OR LITRES PER HOUR AT
DEGREE RISE*
40°F
22°C
DIMENSIONS AND WEIGHT
MODEL
NUMBER
CMC-6
through
CMC-18
CMC-20
through
CMC-54
CMC-6
through
CMC-54
GALLONS OR
LITRES
U.S. Gallons
Litres 34.9 33 55.2 1.91 36.4 kg
U.S. Gallons
Litres 30.5 45.7 57.2 1.91 43.6 kg
U.S. Gallons
Litres 63.5 56.5 58.4 1.91 90.9 kg
CAPACITY
5
5
20
HEIGHT A WIDTH B DEPTH C INLET/OUTLET STANDARD
13.75 13 23.5 3/4 80 lbs.
12 18 23.5 3/4 96 lbs.
25 22.25 23 3/4 200 lbs.
DIMENSIONS IN INCHES
100°F
56°C
140°F
78°C
SHIPPING
WEIGHT
CMC MODELS
SU MODELS
WATTAGE AND VOLTAGE
KW INPUT
6 CMC-6 SU-6 1 6,000 28.8 25 21.7 12.5 16.7 14.4 7.2
9 CMC-9 SU-9 1 9,000 43.3 37.5 32.5 18.8 25 21.7 10.8
12 CMC-12 SU-12 1 12,000 57.7 50 43.3 25 33.3 28.9 14.4
15 CMC-15 SU-15 1 15,000 72.1 62.5 54.2 31.3 41.6 36.1 18
18 CMC-18 SU-18 1* 18,000 86.5 75 65 37.5 50 43.3 21.7
20 CMC-20 SU-20 2 10,000 96.2 83.3 72.2 41.7 55.5 48.1 24.1
24 CMC-24 SU-24 2 12,000 115.4 100 86.6 50 66.6 57.7 28.9
30 CMC-30 SU-30 2 15,000 144.2 125 108.3 62.5 83.3 72.2 36.1
36 CMC-36 SU-36 2 18,000 173.1 150 130 75 99.9 86.6 43.3
45 CMC-54 SU-45 3 15,000 216.3 187.5 162.5 93.8 124.9 108.3 54.1
54 CMC-54 SU-54 3 18,000 N/A 225 194.9 112.5 149.9 129.9 65
*208V models use on additional immersion heater
**Each immersion heater contains three electric elements
AVAILABLE MODEL
CMC SERIES SU SERIES
NUMBER OF
IMMERSION
HEATERS
IMMERSION
HEATER
WATTAGE
208V 240V 277V 480V 208V 240V 480V
SINGLE PHASE THREE PHASE
Revised October 2008 PG 3 OF 4
www.hotwater.com
FULL LOAD CURRENT IN AMPERES
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
www.hotwater.com
AOSCE15700
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