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FIRST
MODEL
HOUR
ENERGY
NUMBER
RATING
FACTOR
GALLONS
GDV-40
73
.62
GDV-50
87
.60
GDVT-50
88
.59
GDV-75
131
.59
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.
75 gallon water connections are 12" on center.
** Allow 25 1/4¨ for 40 and 50–gallon models and 29 1/2¨ for 75–gallon models for
front–to–back dimensions for air intake at the rear of the heater.
GDV–40 Models are ENERGY STAR
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 9006627005.
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.
July 2011R
www.hotwater.com
Residential Gas Water Heaters
DIRECT-VENT
RECOVERY
BTU
GAL.
90ºF RISE
INPUT
CAP.
GALLONS
PER HOUR
PER HOUR
40
38,000
41
50
42,000
45
50
50,000
55
75
55,000
60
®
qualified.
DIMENSIONS IN INCHES
A
B
C**
68
54-3/4 22-1/4
76
63-3/4 22-1/4
76
64-3/4 22-1/4 16-1/4 12-1/2 55-1/2 Co-Axial
76
65-3/4 26-1/4 16-1/4 12-1/2 55-1/2 Co-Axial
6" DIA. on 40 & 50 Gal. Models
7" DIA. on 75 Gal. Models
C
A
B
D
E
FRONT
VENT
OUTLET*
D
E
F
16
12-1/4 45-1/4 Co-Axial
16
12-1/4
54
Co-Axial
40 & 50 gal.
25-1/4
25-1/4
75 gal.
29-1/2
TOP
MIN VENT
17
MAX VENT
80
6 DIA.
F
APPROX.
SHIPPING
WEIGHT
(LBS)
167
185
187
310
42°
47°
75 gal. vent
termination
cap is not
interchangeable
with vent cap
on 40 & 50 gal.
models
EXTERIOR
WALL
Page 2 of 2
AOSRG45700
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