Residential Gas Water Heaters
DIRECT-VENT
ProMax® Direct-Vent Features
DIRECT-VENT DESIGN
One-pipe, dual-channel closed-combustion system draws all make-up air
from outside the home, eliminating problems caused by insufficient indoor
ventilation, and is FVIR compliant
Horizontal air intake and venting on all models up to 80 inches from
outside wall, with no electrical power needed.
A. O. SMITH DYNACLEAN™ DIFFUSER DIP TUBE
Helps reduce lime and sediment buildup, maximizes hot water output.
Made from long-lasting PEX cross-link polymer.
GREEN CHOICE™ GAS BURNER
Patented “eco-friendly” design reduces NOx emissions up to 33% and
complies with Southern California and Texas requirements.
PUSH BUTTON PIEZO IGNITER
Makes lighting pilot fast and easy with one hand push button spark
ignition.
HEAT TRAP NIPPLES Factory installed.
DURABLE TAMPER-RESISTANT BRASS DRAIN VALVE
A. O. SMITH PERMAGLAS® GLASS COATING
Protects steel tank from rust.
FACTORY-INSTALLED TEMPERATURE & PRESSURE (T&P)
RELIEF VALVE
6-YEAR LIMITED TANK & PARTS WARRANTY
For complete information, consult written warranty or A. O. Smith Water
Products Company.
CODE COMPLIANCE: UBC, CEC, SBCC, CABO, HUD, BOCA
NATIONAL CODES, ASHRAE/IES 90.1-1999 AND 2004 NAECA
DESIGN-CERTIFIED BY CSA INTERNATIONAL
According to ANS Z21.10.1 standards governing storage-type water
heaters.
Page 1 of 2
Revised April 2008
AOSRG45700
Residential Gas Water Heaters
DIRECT-VENT
FIRST
HOUR
RECOVERY
90ºF RISE
GALLONS
PER HOUR
APPROX.
SHIPPING
DIMENSIONS IN INCHES
BTU
INPUT
MODEL
ENERGY GAL.
VENT
NUMBER RATING FACTOR CAP.
GALLONS
OUTLET* WEIGHT
(LBS)
A
B
C
D
E
F
PER HOUR
GDV-40
GDV-50
73
87
.62
.60
40
50
38,000
42,000
41
45
68
76
54-3/4 22-1/4
63-3/4 22-1/4
16
16
12-1/4 45-1/4 Co-Axial
12-1/4 54 Co-Axial
167
185
GDVT-50
GDV-75
88
.59
.59
50
75
50,000
55,000
55
60
76
76
64-3/4 22-1/4 16-1/4 12-1/2 55-1/2 Co-Axial
65-3/4 26-1/4 16-1/4 12-1/2 55-1/2 Co-Axial
187
310
131
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.
40 & 50 gal.
25-1/4
Water connection 3/4” male all models.
75 gallon water connections are 12” on center.
75 gal.
29-1/2
Important! Vent Installation and Termination Requirements
42°
47°
n Maximum horizontal vent distance is 80” to outside of exterior wall.
n Minimum horizontal vent distance is 17” to outside of exterior wall.
n Vent pipes may be trimmed (cut) for short vent installations.
n 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.
n 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).
TOP
MIN VENT
17
MAX VENT
80
n Offset Vent Arrangement
6” DIA. on 40 & 50 Gal. Models
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.
7” DIA. o
n 7
5
Gal. Models
75 gal. vent
termination
cap is not
interchangeable
with vent cap
on 40 & 50 gal.
models
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)
n High Rise Vent Arrangement
EXTERIOR
WALL
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
C
installation manual)
n Vent termination clearance hole through the exterior
wall should be approximately 7” diameter.
A
B
n Snow accumulation and drifting should be considered
when locating the termination.
F
n An optional wire grill vent cap protector is available
through the parts department. Part number 9006627.
n See the installation manual for complete installation
and venting requirements.
D
E
FRONT
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.
Page 2 of 2
Revised April 2008
AOSRG45700
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