A.O. Smith ENS-40W+, ENL-36W+, ENL-40+, ENLB-40W+, ENLB-50W+ User Manual
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PROLINE® STANDARD
COMMERCIAL-GRADE RESIDENTIAL
COMMERCIAL-GRADE
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 long-lasting PEX cross-linked
polymer (diffuser design is not used on
lowboy models.)
HIGHER EFFICIENCY
• Eco-friendly non-CFC foam insulation,
heat traps and other features combine to
yield a higher Uniform 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 straightthrough water flow but also a quick and
positive shut off
CODE COMPLIANCE
• Meets UBC and ICC National Codes and
listed with CEC
• 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 UNDERWRITERS
LABORATORIES
• Certified at 300 psi test pressure and 150
psi working pressure
• Listed according to UL 174 standards
governing storage tank-type electric water
heaters
6-YEAR LIMITED TANK AND PARTS
WARRANTY
• For complete information, consult written
warranty or go to hotwater.com
© October 2020 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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AOSRE50608
COMMERCIAL-GRADE
T&P
EA
T&P (All Other Models)
RESIDENTIAL ELECTRIC WATER HEATERS
Model
Number
Tall Models
ENT-30† 30 27 48 0.89 21 4500 1000 6000 46-1/2 39-1/2 19 95
ENT-40† 40 36 53 0.92 21 4500 3500 6000 61-1/4 53-1/4 18 118
ENT-50† 50 46 62 0.92 21 4500 3000 6000 59 51-1/4 20-1/2 125
ENT-55† 55 55 72 0.93 21 4500 2500 6000 56-1/2 48-1/2 24 145
Short Models
ENSB-30* 30 27 50 0.90 21 4500 1000 6000 39 30-1/2 20 95
ENS-30† 30 27 47 0.89 21 4500 1000 6000 39-3/4 30-1/2 22 94
ENS-40† 40 37 55 0.92 21 4500 @ 4500 6000 49-3/4 40-3/4 20-1/2 109
ENS-40W† 40 37 41 0.88 18 - 1000 4000 49-3/4 40-3/4 20-1/2 109
ENS-50† 50 46 57 0.92 21 4500 2500 6000 49-1/4 40-3/8 23 161
Lowboy Top Connect Models
ENLB-30*† 28 26 43 0.89 21 4500 1000 6000 30 21-3/4 20 90
ENL-30† 28 26 44 0.90 21 4500 1000 6000 31 1/4 21-3/4 24 115
ENL-36† 36 33 51 0.92 21 4500 @ 4500 6000 32 24 24 118
ENL-36W† 36 33 37 0.89 18 - 1000 4000 32 24 24 118
ENL-40† 38 35 50 0.89 21 4500 1000 6000 33 1/2 24 26 118
ENLB-40*† 38 35 51 0.92 21 4500 @ 4500 6000 32 24 23 118
ENLB-40W*† 38 35 38 0.90 18 - 1000 4000 32 24 23 118
ENLB-50*† 48 44 60 0.93 21 4500 @ 4000 6000 34 25 26-1/2 172
ENLB-50W*† 48 44 40 0.91 16 - 1000 3500 34 25 26-1/2 172
ENL-50† 51 48 51 0.92 21 4500 4000 6000 36 25 26-1/2 172
Male 3/4” water connections on 8” center.
*Models ship with supplied insulation blanket.
†For 10-year tank and 10-year parts warranty, change “E” to “P” in the model number (example: ENT-30 becomes PNT-30).
Models requiring a lower wattage than what is listed in the minimum wattage column and showing the @ symbol, will change to a “W” suffix model number.
“W” suffix models are available down to 1kW. (example: ENS-40 using 4,000 watt elements or less will become “ENS-40W”).
Top T&P is not available on the 10 year lowboy models and the ENL-40.
Dimensions and specifications subject to change without notice in accordance with our policy of continuous product improvement.
Minimum wattage for ENT-50 is 3000 watts.
Nominal
Capacity
Rated
Storage
Volume
First Hour
Rating
(Gallons)
UEF
Recovery @
90°F Rise
Gallon Per
Hour
Element Wattage 240V Dimensions in Inches
Standard Minimum Maximum A B C
Shipping
Weight (lbs)
Approx.
VALV
ACCESS
PANEL
NODE
SECOND ANODE ROD FOR LOWBOYS
OR OPTIONAL TOP
JUNCTION
BOX
T&P VALVE
ACCESS
PANEL
DRAIN
VALV E
For technical information call 800-527-1953. A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice.
© October 2020 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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AOSRE50608
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