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FIRST
MODEL
HOUR
ENERGY
NUMBER
RATING
FACTOR
GALLONS
GDV-40L
73
.62
GDVT-50L
88
.58
GDV-75L
131
.57
Recovery capacities based on actual performance tests.
* Dual-channel system has 3˝ vent pipe inside 6˝ air intake pipe, for the 40 & 50 gallon models.
The 75-gallon model uses a 4"x 7" co-axial pipe.
All models have 2" foam cavity.
Water connection 3/4" male all models.
All models are certified for sale in Canada (add SMR "T25").
75 gallon water connections are 12" on center.
Important! Vent Installation and Termination Requirements
Maximum horizontal vent distance is 80" to outside of exterior wall.
Minimum horizontal vent distance is 17" to outside of exterior wall.
Vent pipes may be trimmed (cut) for short vent installations.
For vent installation less than 30" the vent restrictor is required. Place restrictor
over the flue outlet on heater before installing the outlet vent pipe to the heater.
Recommended installation height for the heater vent pipe should be 68" for 40
gallon models and 76" for the 50-gallon and 75-gallon models (vent height).
Offset Vent Arrangement
1. When replacing an existing direct vent model, the new vent pipe
may drop from the minimum vent height as much as 7 1/4" to exit
through the existing vent opening in the exterior wall.
2. Vent may have one horizontal 90 degree turn before exiting through
exterior wall (Do not combine both offset vent arrangements in one
installation) (See examples in the installation manual)
High Rise Vent Arrangement
3. When vent termination is more than 80" above
the base of the heater. The horizontal vent run must
be a minimum of 22" from the center of the heater to
the outside exterior wall surface. (See example in the
installation manual)
Vent termination clearance hole through the exterior
wall should be approximately 7" 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 9006627.
See the installation manual for complete
installation and venting requirements.
For Technical Information and Automated Fax Service, call 800-527-1953. A. O. Smith Corporation reserves the right to make produ ct changes or improvements without prior notice.
April 2011R
Revised
September
2009
www.hotwater.com
Residential Gas Water Heaters
®
SL
BTU
RECOVERY
GAL.
INPUT
90ºF RISE
CAP.
PER
GALLONS
A
HOUR
PER HOUR
40
38,000
41
68 54-3/4 22-1/4
50
50,000
55
76 64-3/4 22-1/4 16-1/4 12-1/2 55-1/2
75
55,000
60
76 65-3/4 26-1/4 16-1/4 12-1/2 55-1/2 17-1/4
DIRECT-VENT
DIMENSIONS IN INCHES
B
C
D
E
16
12-1/4 45-1/4
6" DIA. on 40 & 50 Gallon Models
7" DIA. on 75 Gallon Models
C
A
SIDE
B
TAPS
D
E
FRONT
F
G
H
16-1/2
41-3/4
16-1/2
53-3/4
54
40 & 50 gal.
25-1/4
25-1/4
75 gal.
29-1/2
42°
47°
55°
TOP
MIN VENT
17
MAX VENT
80
6 DIA.
F
H
G
APPROX.
VENT
SHIPPING
OUT-
WEIGHT
LET*
(LBS)
Co-Axial
167
Co-Axial
187
Co-Axial
310
69°
75 gal vent
termination
cap is not
interchangeable
with vent cap
on 40 & 50 gal
models
EXTERIOR
WALL
Page 2 of 2
AOSRG46400
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