A.O. Smith GDNL-40L-100, GDNT-50L-100 User Manual
ULTRA-LOW NOx DIRECT VENT
Residential Gas
Water Heaters
FLAMMABLE VAPOR RESISTANT/
DIRECT VENT SEALED COMBUSTION
SYSTEM
• Thru-the-wall/thru-the-roof venting of
combustion products.
• Air for combustion is drawn from outside the
building.
DURABLE, ULTRA-LOW NOX BURNER
CONSTRUCTION
NON-CFC FOAM INSULATION
• The tank is surrounded by a thick coat of
non-CFC polyurethane foam to trap heat
inside the tank, saving energy.
¾” TOP WATER CONNECTIONS AND
SIDE SPACE HEATING CONNECTIONS
½” GAS CONNECTION
COMBINATION THERMOSTAT/ECO
• Factory-preset pressure regulator and built-in
millivolt-powered energy cut-off for overheat
protection
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
• All 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.
GREEN CHOICE® GAS BURNER
• Complies with SCAQMD Rule 1121 and
other air quality management districts with
similar requirements for NOx emissions of
less than 10 ng/J.
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.
CSA CERTIFIED AND ASME RATED
T&P RELIEF VALVE
DESIGNED-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 gas
water heaters.
6-YEAR LIMITED TANK AND PARTS
WARRANTY
• For complete information, consult written
warranty or go to hotwater.com.
©2015 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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AOSRG47006
Residential Gas
Water Heaters
Dimensions in Inches
Weight (lbs)
Factor
Recovery
90°F Rise
Gallon Per
Hour
First Hour
Model Number
GDNL-40L-100 40 59 0.62 39 36,000 3 and 5 65-1/4 50-1/2 22 13-1/2 30 43-7/8 15 45 179
GDNT-50L-100 50 81 0.62 41 38,000 3 and 5 73-1/2 58-1/2 22 13-1/2 30 52-1/4 15 53 193
No option available for top T&P valve.
All models have ¾” side and top water connections and ½” gas connections.
All models certified from sea level to 7,700 ft. elevation.
Dimensions and specifications are subject to change without notice in accordance with our policy of continuous product improvement.
Gallon
Capacity
Rating
Gallon
Energy
BTU
Input
Per
Hour
Concentric
Vent
Connection
A B C D E F G H
IMPORTANT! VENT INSTALLATION AND
TERMINATION REQUIREMENTS
• Maximum horizontal vent distance is 80” to
PROMAX ULTRA-LOW NOx DIRECT VENT
the outside of exterior wall.
• Maximum vertical vent distance is 68” above
heater before 90 degree turn through exterior
TOP VIEW
wall.
• Minimum horizontal vent distance is 17” to
outside of exterior wall if vent height is less
than 48” above heater.
• Minimum horizontal vent distance increases
to 22” if vent height is betweet 48” and 68”
5˝
E
HOT OUTLET
17˝/ 22˝ MIN.
80˝ MAX. HORIZONTAL VENT
COLD INLET
above top of heater.
• Vent pipes may be trimmed (cut) for short
vent installations.
• The recommended installation height for
the vent termination is dimension “A” in the
above table. The minimum allowable height
THRU-THE-WALL
INSTALLATION
MAX. HEIGHT IS
68˝ ABOVE
TOP OF HEATER
(center line of termination opening) is 60
¾” for the 40-gallon model, 69 ½” for the
50-gallon,
• Vent termination clearance hole through the
exterior wall should be approximately 6”
diameter.
• Snow accumulation and drifting should be
considered when locating the termination.
• An optional wire grill vent cap protector is
available through the parts department
(part number 9006627005).
• See the installation manual for complete
installation and venting requirements.
GAS
VALVE
OUTLET
C
T&P
VALVE
T&P
A
VALVE
B
F H
Approx.
Shipping
INLET
SIDE VIEW
For technical information 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
D
FRONT VIEW
G
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AOSRG47006
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