Page 1
Commercial Gas Circulating
Water Heaters
BURKAY® GENESIS
85% EFFICIENT, ULTRA-LOW NOx HOT WATER HEATER
A. O. Smith Genesis® Water Heaters offer everything you could ask for in a non-condensing water
heater. They provide a near condensing 85% thermal efficiency, outstanding venting flexibility,
space-saving stackable design and a clean burning fan assisted combustion system with low NOx
emissions that meet the most stringent California standards.
ELECTRONIC CONTROL WITH PRECISE
TEMPERATURE MANAGEMENT
• Controls every electrical water heater function,
including pump operation and main burner
ignition, delivers precise temperature management,
with ±1º accuracy.
• Display panel shows current operating status and
fault readings
• Display also shows temperature setpoints, outlet
temperature, current inlet/outlet differential (DT)
and tank temperature.
• Included remote temperature sensor when
mounted in the storage tank allows the tank
temperature to be set and monitored at the water
heater.
STAGE GAS FIRING SYSTEM
• Prevents short cycling and ensures smooth
operation, saves fuel and extends product life.
• Delivers maximum output when demand is high,
reduced firing rates during off peak times.
ULTRA-LOW NOx OPERATION
• Meets SCAQMD Rule 1146.2 air quality standards.
COPPER FINNED-TUBE HEAT
EXCHANGER
• Gasketless glasslined headers and copperfinned tubes with extruded integral fins deliver
exceptional heat transfer.
• Copper is lightweight for easier handling and
immune to thermal shock.
SPACE-SAVING DESIGN
• Optional stack rack allows one unit to be stacked
on top of another, doubling output within the
footprint of a single unit.
• If floor space is limited, the Genesis water
heater can be installed outdoors with an
optional outdoor Vent Cap.
MEETS ASHRAE/IESNA 90.1-2004
MULTIPLE VENTING OPTIONS
• All Genesis models can vent vertically in
Category I with double wall “B” vent or
horizontally in Category IV with AL29-4C
stainless steel vent material.
FACTORY START-UP INCLUDED
• Required for activating warranty and
assuring maximum operating performance.
Contact your local sales representative or
Authorized Start-Up Agent to arrange a
FREE Certified Start-Up.
5-YEAR LIMITED HEAT EXCHANGER
WARRANTY
• For complete warranty information, consult written
warranty or contact A. O. Smith.
GWH-400 THRU GWH-2100
©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
Page 1 of 4
AOSCG25200
Page 2
Commercial Gas Circulating
Water Heaters
OTHER GENESIS® FEATURES
• Stage Firing – 2 Stages
• Sealed Combustion Chamber
• Stainless Steel Burners
• Low NOx Operation
• All Bronze Circulating Pump (Shipped Loose)
• On/Off Switch
• Adjustable High Limit w/ Manual Reset
• Pump Delay
• ASME Copper Finned Tube Heat Exchanger Certified “HLW”
Stamped 160 PSI Working Pressure
• ASME Temperature & Pressure Relief Valve 125#
• Factory mounted Flow Switch
• BMS Terminal Strip
• Contacts for Air Louvers
• Contacts on any Failure
GENESIS® OPTIONS
• Cupro-Nickel Heat Exchanger
• High Gas Pressure Switch w/ Manual Reset
• Low Gas Pressure Switch w/ Manual Reset
• Low Water Cut-Off w/ Manual Reset & Test
• Stack Rack
• Combustible Floor Shield (400 – 750)
• International Voltage (230V 50Hz)
SEQUENCING PANEL – Can manage 1 to 4 two
stage water heaters
• Includes remote Tank sensor and sensor well
• Controls each stage of multiple stage fired water heater(s)
to meet system demand
• Provides Cascade/Lead-Lag operation when multiple units
are connected
DIRECT VENT
OUTDOOR
POWERED SIDEWALL
W/DUCTED INTAKE
SIDEWALL
DUCTED AIR
w/SIDEWALL INLET
DIRECT VENT
VERTICAL
CONVENTIONAL
POWERED
SIDEWALL
Inlet Gas Pressure
Model
400-1200 14.0 4.5 14.0 8.0
Do not exceed the maximum Inlet Pressure. Minimum inlet pressure is for the
purpose of input adjustment.
Model
Number
GWH-400N 3.6 2.7 5.8 12.1
GWH-500N 3.6 2.7 5.8 12.1
GWH-650N 5.4 3.4 5.8 14.6
GWH-750N 5.4 3.4 5.8 14.6
GWH-1000N 7.3 3.2 7.4 17.9
GWH-1250N 7.3 3.2 7.4 17.9
GWH-1450N 7.3 6.7 7.4 21.4
GWH-1800N 7.3 6.7 7.4 21.4
GWH-2100N 7.3 6.7 7.4 21.4
©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
Natural LP
Max. W.C. Min. W.C. Max. W.C. Min. W.C.
Amp Draw Data
Controls Blower Pump Fla*
Approx.
Total
Amp’s @
120 VAC
MULTIPLE VENTING OPTIONS
The Genesis models offer eight venting options to meet the most challenging installation requirements. The
Genesis can vent vertically in Category I with double wall “B” vent or horizontally in Category IV with AL29-4C
stainless steel vent material.
Note: For the most current Genesis venting distances/information, consult the Genesis Product Manual, available through your
local A. O. Smith representative, or online at www.hotwater.com.
Model
Number
GWH-400N 6” 6” 50’ 50’ 50’/50’ 50’/50’ 50’
GWH-500N 6” 6” 50’ 50’ 50’/50’ 50’/50’ 50’
GWH-650N 8” 8” 50’ 50’ 50’/50’ 50’/50’ 50’
GWH-750N 8” 8” 50’ 50’ 50’/50’ 50’/50’ 50’
GWH-1000N 10” 10” 50’ 100’ 100’/100’ 50’/50’ 50’
GWH-1250N 12” 12” 50’ 100’ 100’/100’ 50’/50’ 50’
GWH-1450N 12” 12” 50’ 100’ 100’/100’ 50’/50’ 50’
GWH-1800N 14” 12” 50’ 100’ 100’/100’ 50’/50’ 50’
GWH-2100N 14” 12” 50’ 100’ 100’/100’ 50’/50’ 50’
Note: 90 degree ells = 5’ of pipe, 45 degree ells = 2 1/2’ feet of pipe
Vent
Outlet
Size
Combustion
Air Inlet
Sidewall
Maximum Equivalent Feet of Pipe
Powered
Sidewall
Powered
Sidewall w/
Ducted Air
Direct Vent
Ducted Air
w/Sidewall
Intake
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AOSCG25200
Page 3
GENESIS® GAS WATER HEATER DIMENSIONS AND SPECIFICATIONS
Commercial Gas Circulating
Water Heaters
Model
Number
Input
MBH
GPH @
40°F Rise
GPH @
100°F Rise
GPH @
140°F Rise
Dimensions in Inches
A B C D E F G H J K L
Weight (lbs)
GWH-400N 399 1,028 412 294 31-1/2 7 37-5/8 8-7/8 12-1/2 7 3-1/4 29-3/4 6-3/8 12-5/8 22-1/4 454
GWH-500N 500 1,288 515 368 31-1/2 7 45-3/8 8-7/8 12-1/2 7 3-1/4 29-3/4 6-3/8 12-5/8 22-1/4 467
GWH-650N 650 1,674 670 478 31-1/2 8-1/2 56-3/4 8-7/8 12-1/2 8-1/2 3-1/4 29-3/4 6-3/8 12-5/8 22-1/4 551
GWH-750N 750 1,932 773 552 31-1/2 8-1/2 64 8-7/8 12-1/2 8-1/2 3-1/4 29-3/4 6-3/8 12-5/8 22-1/4 611
GWH-1000N 990 2,550 1,020 729 36 8-3/4 48-1/2 5-7/8 15-7/8 22-1/2 8-1/2 33-3/4 8-3/4 19-7/8 33 843
GWH-1250N 1,260 3,245 1,298 927 36 9-3/4 58-3/4 5-7/8 15-7/8 22-1/2 9-3/4 33-3/4 8-3/4 19-7/8 33 939
GWH-1450N 1,440 3,709 1,484 1,060 36 10-1/2 68-7/8 5-7/8 15-7/8 22-1/2 10-1/4 33-3/4 8-3/4 19-7/8 33 1,035
GWH-1800N 1,800 4,636 1,855 1,325 36 11 82-3/8 5-7/8 15-7/8 22-1/2 10-7/8 33-3/4 8-3/4 19-7/8 33 1,168
GWH-2100N 2,070 5,332 2,133 1,523 36 11 92-5/8 5-7/8 15-7/8 22-1/2 10-7/8 33-3/4 8-3/4 19-7/8 33 1,285
Pump and flanges are shipped loose for field installation.
Gas connect pipe size is 1¼” for models GWH-400 to GWH-750 and is 2” for models GWH-1000 to GWH-2100.
Water connections for models GWH-400 to GWH-750 are 2” NPT on 6-1/2” centers.
Water connections for models GWH-1000 to GWH-2100 are 2-1/2” NPT on 11-1/4” centers.
Performance data is based on manufacturer test results.
Dimensions and specifications subject to change without notice in accordance with our policy of continuous product improvement.
B
A
AIR
INLET
CO NN ECTION
GAS
INLET
OUTLET
F
G
EXHAUST
VENT
EXHAUST
VENT
INLET
OUTLET
H
F
G
GAS
CO NN ECTION
Approx.
Shipping
H
E
C D
DR AIN
SIDE VIEW
J
K
L
GWH-400 THRU GWH-750
©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
E
DR AIN
J
K
L
GWH-1000 THRU GWH-2100
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AOSCG25200
Page 4
Commercial Gas Circulating
Water Heaters
SPECIFICATION
The WATER HEATER shall be a A. O. Smith Genesis Model GWH_________ having an input rating of _________ Btu/hr, a recovery capacity of _________
gallons per hour at a 100° F rise and shall be operated on (Natural Gas) (L.P. Gas).
The water containing section shall be of a “Fin Tube” design, with straight copper tubes having extruded integral fins spaced seven (7) fins per inch. The tubes
shall terminate into a one piece, glass lined, cast iron header. There shall be no bolts, gaskets or “O” rings in the head configuration. There shall be access to
the front header of the heat exchanger for the purposes of inspection, cleaning or repair. The heat exchanger shall be mounted in a stress free jacket assembly
in order to provide a “free floating design” able to withstand the effects of thermal shock. The WATER HEATER shall bear the ASME “HLW” stamp for 160 PSI
working pressure and shall be National Board listed. The complete heat exchanger assembly shall carry a five (5) year limited warranty. The WATER HEATER shall
be equipped with a factory supplied circulating pump of sufficient capacity to ensure scale free heater performance. The pump shall be all bronze and provided
for operation on 120 volt, 60 cycle, 1 phase power supply (unless otherwise specified).
The combustion chamber shall be sealed and completely enclosed with ceramic fiberboard insulation. A burner/flame observation port shall be provided at both
ends of the water heater. The burners shall be a premix design and be constructed of high temperature stainless steel and fire on a horizontal plane.
The WATER HEATER shall be constructed with a heavy gauge galvanized steel jacket assembly, primed and pre-painted on both sides with a minimum dry film
thickness of 0.70 mils.
The WATER HEATER shall be certified and listed by C.S.A. International under the latest edition of the harmonized ANSI Z21.10.3 test standard for the US and
Canada. The WATER HEATER shall comply with the energy efficiency requirements of the latest edition of the ASHRAE 90.1 Standard. The WATER HEATER shall
operate at a minimum of 85% thermal efficiency.
The WATER HEATER shall provide pump delay with freeze protection feature. Terminal strip with connections for BMS control of the burner stages shall be
provided. Supply voltage shall be 120 volt / 60 hertz / single phase.
The standard control system shall include redundant Proven Pilot Hot Surface Ignition with full flame monitoring capability. Multiple main gas valves with
redundant valve seats and built in low gas pressure regulators shall be supplied as standard.
Additional standard controls shall include a flow switch, low air/blocked flue pressure switch for each fan, low voltage transformer for the control circuit, 7
amp circuit breaker and an ASME temperature and pressure relief valve. The manufacturer shall verify proper operation of the burners, all controls and the heat
exchanger by connection to water and venting for a factory fire test prior to shipping. A quality test report shall be shipped with each unit.
The WATER HEATER shall be approved for indoor or outdoor installation. Multiple venting options shall be available. Vertical venting systems shall be classified
Category I, negative draft, non-condensing, to use type “B” double wall venting materials. Horizontal or direct vent installations require the use of AL29-4C vent
materials.
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
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AOSCG25200
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