A. O. Smith GDHE-75 User Manual
Residential Gas Water Heaters
VERTEX™ 96% THERMAL EFFICIENCY
CONTINUOUS HOT WATER
VERSATILE POWER DIRECT VENT
Today’s homes demand more hot water than ever before, and the 96% efficient Vertex power
direct vent gas water heaters offer unprecedented levels of performance to meet the need. The
fully condensing Vertex design is so advanced, it can deliver “continuous hot water for shower
after shower” ... a constant flow of over 4 gallons per minute.*
FEATURES
ENERGY STAR® QUALIFIED
HELICAL INTERNAL HEAT EXCHANGER
■ Spiral heat exchanger keeps hot combustion
gases in the tank longer lengthen the heat
transfer cycle
■ Positioned in the center of the tank for
more even heat distribution
■ Operates at 96% thermal efficiency,
which saves money on operating costs
compared to a standard 80% efficient
gas water heater
POWER DIRECT VENT DESIGN
■ Uses inexpensive PVC, CPVC, ABS or
polypropylene pipe for intake and
exhaust. Canadian installations require
ULC S636 listed PVC, CPVC or polypropylene
pipe for venting
■ Can be vented vertically thru-the-roof or
horizontally thru-the-wall
■ 2” pipe, vents up to 45 equivalent feet
■ 3” pipe, vents up to 128 equivalent feet
■ Optional concentric vent kit available
CONDENSING DESIGN
■ 96% efficient condensing design
■ Equipped with condensate drain tee
SIDE-MOUNTED HOT AND COLD
RECIRCULATING TAPS
■ Allows Vertex to be installed as part of
combination space heating/water heating
applications
ADVANCED ELECTRONIC CONTROL
■ Large LCD display
■ Precise temperature control
■ Advanced diagnostics
■ iCOMM™ Compatible and can
be monitored from remote
locations. Call 1.888.WATER02
for more information.
HEAVY-DUTY ANODIC PROTECTION
■ Provides even more protection
against corrosion
COMMERCIAL GRADE GLASS LINING
■ A. O. Smith PermaGlas® Ultra Coat™
process provides superior protection
against corrosion
■ Protects all interior tank surfaces
including inside and outside of the
helical heat exchanger
TOP FIRED ULTRA-LOW NOx GAS BURNER
■ Enhanced Ultra-low NOx burner complies
with SCAQMD Rule 1121 and other
Air Quality Management Districts with
similar requirements for NOx emissions
of less than 10 ng/j
CSA CERTIFIED AND ASME RATED
T&P RELIEF VALVE
AVAILABLE IN NATURAL GAS
OR PROPANE
MAXIMUM HYDROSTATIC WORKING
PRESSURE: 150 PSI
CODES AND STANDARDS
■ Design-certified by CSA International
according to ANSI Z21.10.3 - CSA 4.3
Standards
■ These models meet the thermal
efficiency and standby loss requirements
of the U.S. Department of Energy and
current edition ASHRAE/IESNA 90.1.
■ Approved for Canada
SIX-YEAR LIMITED TANK AND
PARTS WARRANTY
■ For complete information, consult
written warranty or contact
your local sales rep.
GDHE-50 & GDHE-75
Model Shown
GDHE-50
Series 130/131
Model GDHE-50 *4.31 GPM continuous flow, based on 65ºF inlet water temperature, 110ºF outlet temperature.
A. O. Smith Corporation • 500 Tennessee Waltz Parkway • Ashland City, TN 37015 • 800-527-1953 Toll-free USA
www.hotwater.com
Page 1 of 2
AOSRG45102
Residential Gas Water Heaters
3” DIAMETER
VENT/EXHAUST
3” DIAMETER PVC
INTAKE/COMBUSTION AIR
1 1/2”
21 1/8”
4 1/2” DIAMETER
1 3/16”
39”
INSTALL IN ACCORDANCE WITH LOCAL CODES.
ANODE
INLET
TOP VIEW
OUTLET
F
VERTEX™ 96% THERMAL EFFICIENCY CONTINUOUS HOT WATER
VERSATILE POWER DIRECT VENT
SPECIFICATIONS
MODEL
NUMBER
BTU INPUT
PER HOUR
GALLONS
(LITRES)
RECOVERY
GPH (LPH)
90°F / 50°C RISE
SHIPPING WEIGHT
lb (kg)
GDHE-50 100,000 50 (189) 129 (488) 255 (116)
GDHE-75 100,000 75 (284) 129 (488) 382 (173)
DIMENSIONS IN INCHES (CM)
MODEL
NUMBER
GDHE-50 66-3/4 (169.5) 49-1/4 (125.1) 22 (55.9) 15-3/4 (40) 3 (7.6) 8 (20.3)
GDHE-75 64-3/4 (164.4) 45-5/8 (116) 27-3/4 (70.5) 16 (40.6) 3-3/4 (9.4) 8 (20.3)
Available in Propane (LP) Gas (Series becomes 131)
Inlet and outlet connections: 3/4” male for GDHE-50 and 1” for GDHE-75
Circulation loop connections: 3/4” female
Gas inlet:1/2”
Maximum Supply Pressure: 14 inches W.C. (3.48kPa)
Minimum Supply Pressure for Natural Gas: 3.50 inches W.C. (.87kPa)
Minimum Supply Pressure for Propane Gas: 8.00 inches W.C. (1.99kPa)
Minimum pressure must be maintained under both load and no load (dynamic and static) conditions.
Electrical Characteristics - 120V, 60Hz, Amperes <5
A B C D E F
ANODE
F
GDHE-50
OUTLET
TOP VIEW
INSTALL IN ACCORDANCE WITH LOCAL CODES.
INLET
GDHE-75
TOP VIEW
FRONT VIEW
For Technical Information and Automated Fax Service, call 800-527-1953. A. O. Smith reserves the right to make product changes or improvements without prior notice.
A. O. Smith Corporation • 500 Tennessee Waltz Parkway • Ashland City, TN 37015 • 800-527-1953 Toll-free USA
www.hotwater.com
FRONT VIEW
Page 2 of 2
AOSRG45102
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