AO Smith ENT50 Instruction Manual
Residential Electric
Water Heaters
ENHANCED HEATING ELEMENTS
• Dual 4500 watt elements for fast recovery and
reliable operation.
• Incoloy stainless steel lower element lasts longer
than a standard copper element.
DYNACLEAN™ DIFFUSER DIP TUBE
• Helps reduce lime and sediment buildup and
maximizes hot water output. Made from longlasting PEX cross-linked polymer.
HIGH ENERGY FACTORS
• Eco-friendly non-CFC foam insulation, heat traps
and other features combine to yield a higher
Energy Factor that maximizes savings on operating
costs.
COREGARD™ ANODE ROD
• Our anode rods have a stainless steel core that
extends the life of the anode rod allowing superior
tank protection far longer than standard anode
rods.
BLUE DIAMOND® GLASS COATING
• Provides superior corrosion resistance compared to
industry standard glass lining.
ENHANCED FLOW BRASS DRAIN
VALVE
• Our residential water heaters have a solid brass,
tamper resistant, enhanced flow, ball type, drain
valve.
• Uses a standard female hose fitting that allows for
fast and easy draining during maintenance.
• Designed for easy operation, this valve includes
an integral screwdriver slot that features a ¼ turn
(open/close) radius, which not only permits full
straight-through water flow but also a quick and
positive shut off.
CODE COMPLIANCE
• Meets UBC, CEC and HUD National Codes.
• Meets the thermal efficiency and standby loss
requirements of the U.S. Department of Energy
and current edition of ASHRAE/IESNA 90.1.
• Complies with the Federal Energy Conservation
Standards effective April 16, 2015, in accordance
with the Energy Policy and Conservation Act
(EPCA), as amended.
APPROVED FOR MANUFACTURED
HOUSING
• All residential electric water heaters are
compliant with HUD Standards for mobile homes/
manufactured housing.
CERTIFIED TO UL 174 FOR
HOUSEHOLD ELECTRIC WATER
HEATERS
CSA CERTIFIED AND ASME RATED
T&P RELIEF VALVE
DESIGN-LISTED BY CSA
INTERNATIONAL
• Certified at 300 PSI test pressure and 150 PSI
working pressure.
• Listed according to ANSI Z21.10.1-CSA 4.1
standards governing storage tank-type water
heaters.
6-YEAR LIMITED TANK AND PARTS
WARRANTY
• For complete information, consult written
warranty or A. O. Smith.
©2014 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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AOSRE50602
Residential Electric
E
T&P
Water Heaters
Element Wattage 240V Dimensions in Inches
Model
Number
ENT-30† 30 43 0.95 20.7 4500 6000 19 46-1/2 39-1/2 95
ENT-40† 40 51 0.95 20.7 4500 6000 20 60-1/4 53-1/4 118
ENTB-50* 50 69 0.95 20.7 4500 6000 21 60-1/4 51-1/4 131
ENT-50† 50 69 0.95 20.7 4500 6000 22 60-1/2 51-1/4 134
ENT-55† 55 76 0.94 20.7 4500 6000 24 56-1/2 48-1/2 145
ENSB-30* 30 43 0.95 20.7 4500 6000 20 39 30-1/2 95
ENS-30† 30 43 0.95 20.7 4500 6000 22 39-3/4 30-1/2 94
ENS-40† 40 54 0.95 20.7 4500 6000 22 50 40-3/4 109
ENS-50† 50 62 0.95 20.7 4500 6000 24 49-3/4 40-3/8 161
ENL-30 28 41 0.95 20.7 4500 6000 24 31-1/4 21-3/4 115
ENLB-30* 28 40 0.95 20.7 4500 6000 22 30 21-3/4 96
ENLB-40* 38 46 0.95 20.7 4500 6000 24 31-3/4 24 118
3/4” water connections on 8” center.
*Models ship with supplied insulation blanket.
†For 10-year tank and 6-year parts warranty, change “E” to “P” in the model number (example: ENT-30 becomes PNT-30).
Dimensions and specifications subject to change without notice in accordance with our policy of continuous product improvement.
Gallon
Capacity
First Hour
Rating
Gallon
Energy
Factor
Recovery @
90°F Rise
Gallon Per
Hour
Standard Maximum A B C
Weight (lbs)
Approx.
Shipping
VALVE
ACCESS
PANEL
ANODE
JUNCTION
BOX
T&P VALV
ACCESS
PANEL
DRAIN
VALVE
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.
www.hotwater.com | 800-527-1953 Toll-Free USA
AOSRE50602
Page 2 of 2
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