A.O. Smith GW-GWO-2500, GW-GWO-1000 User Manual
FEATURES
84% THERMAL EFFICIENCY – The absolute highest thermal
efficiency possible by a non-condensing boiler is achieved by
the new Genesis Boiler.
Low NOx –Precise amounts of gas and air are premixed through
special Pre-Jet Orifices and forced through stainless steel
burners that provide complete and clean combustion. Meets or
exceeds California SCAQMD air quality standards.
EXCLUSIVE DIA-SCAN II W/STAGED FIRING – The Dia -Scan II is
a complete microprocessor based boiler control. Every electrical
boiler function; from starting the pump, to stage firing the main
burner, to cycling the pump off at the end of a heating cycle; is
controlled and monitored by the onboard computer. A
comprehensive display panel includes LEDs that indicate
current operating and fault status. A digital LED displays
temperature set points, outlet temperature, current inlet/outlet
differential (∆T), tank temperature, and additional numerical fault
codes. Precise temperature management is plus or minus 1°.
In addition, the Dia-Scan II provides true self-diagnostic
capabilities, eliminates guesswork, and reveals exactly where
the problem is. Troubleshooting has never been easier.
ST AGED FIRING – All second family Genesis boilers are staged
fired. The boiler automatically adjusts its firing rate and btu
output to maintain precise system temperature control. Each
stage is user programmable; allows the boiler to be tailored to
the installation and adjusted for optimum boiler performance
and overall system efficiency. Models GW-1000 thru GW-1500
have three stages; Models GW-1850 thru GW-2500 have four
stages.
HEA T EXCHANGER
HEA VY-DUTY CAST HEADERS – Choose from heavy non-ferrous
all bronze headers or heavy cast iron Cora-Shield Coated
headers. Genesis boiler headers are split bolted designs that
allow complete and easy inspection of all internal header water
surfaces and easy inspection of the copper tubes.
HIGH EFFICIENCY HIGH HEAT TRANSFER – A.O. Smith’s
distinctive double row integral finned copper heat exchanger
provides maximum heat transfer and utilizes a self-baffling
staggered tube design, that assures 84% thermal efficiency.
INTEGRAL REAR HEADER BOILER MOUNTED PUMP – Factory
sized and integrally rear header mounted, pre-wired bronze fitted
pump is standard. Dia-Scan II controlled pump time delay allows
the removal of useable residual heat from the combustion
chamber during the stand-by cycle. Practically eliminates standby heat loss.
FACT ORY TESTED – Each Genesis boiler is water and fire tested
before leaving the factory
UNMA TCHED VENTING FLEXIBILITY – Multiple venting options;
choose from several conventional or direct venting options.
Multiple openings options; choose from exhaust outlet leaving
the top of boiler or exhaust outlet-leaving the rear of boiler.
STACKABLE SPACE SAVING DESIGN – Up to 5 million btu's in
the space of a 2.5 million btu boiler .
OTHER FEA TURES
ASME Pressure Relief Valve 125# • Mounted Flow Switch
• Remote Tanks Temperature Sensor • Alternate Thermostat
Terminals (24V) • Manual Reset High Limit • Blocked Flue
Switch • Fan Proving Switch • Adjustable Pump Delay .
HOT WATER SUPPLY BOILERS
MODELS GW/GWO-1000 THRU GW/GWO-2500
ASME
CRN
OPTIONS
Code Options: CSD-1, California Code, IRI,
New York, and Illinois School Code.
• Alarm Bell
• Outdoor Models
• Stack Rack
• Low Water Cut Off
• Extended Power Venting Kits
• Dry Contacts For Any Boiler Failure
• Direct and Sidewall Vent Terminal Kits
• Cupro-Nickel Tubes
• Hard Water Pump (inline)
• Sequencing Control Panel (2-8 Boilers)
LIMITED WARRANTY OUTLINE
If the heat exchanger should fail within 5 years, under
the terms of the warranty, A.O. Smith will furnish a
replacement part; installation, labor, handling and local
delivery extra. THIS OUTLINE IS NOT A WARRANTY.
For complete information, consult the written warranty
or A.O. Smith Water Products Company.
Warranty does not apply to product installed outside of the
United States of America or its territorial possessions and
Canada.
Revised March 2003
A 012.15
AIR INLET
ALTERNATE EXHAUST
CONTROL BOX CONTAINING
CCB AND ICB BOARDS
5 7/16"
G
ELECTRICAL
CONNECTIONS
OUTLET/ECO
GAS INLET
E
A
FLOW
SWITCH
F
31 3/4"
TOP VIEW
B
C
17"
D
14 1/2"
PRESSURE RELIEF VALVE
INLET
TEMP.
All Dimensions in Inches
A
Water Gas Width B Width
Model Connections Connections Vent Inlet Air WO/Pump Height C D E F G W/Pump
GW-1000 2 1/2 2 10 8 47 40 1/2 14 12 1/2 36 1/4 31 3/4 20 3/4 64
GW-1300 2 1/2 2 12 10 57 1/2 40 1/2 24 3/4 12 1/2 36 1/4 31 3/4 16 1/2 74 1/2
GW-1500 2 1/2 2 12 10 64 1/2 40 1/2 30 12 1/2 36 1/4 31 3/4 18 81 1/2
GW-1850 2 1/2 2 1/2 14 12 78 3/4 43 1/4 27 3/4 11 1/2 35 1/4 32 1/2 34 1/4 95 3/4
GW-2100 2 1/2 2 1/2 14 12 85 1/2 43 1/4 31 11 1/2 35 1/4 32 1/2 33 1/2 102 1/2
GW-2500 2 1/2 2 1/2 16 14 99 1/2 43 1/4 38 11 1/2 35 1/4 32 1/2 36 1/4 116 1/2
Maximum gas supply pressure is 13.8" W.C. for both Natural and Propane Gas.
The minimum supply gas pressure is 7" W.C. for Natural Gas.
The minimum supply gas pressure for Propane is 11.0" W.C.
Requires: 120V, 60 Hz, 30 Amps.
HOT WATER SUPPLY BOILER RECOVER Y CAPACITIES
T emperature Rise -Degrees F . Gallons Per Hour
Input Rating BTU/Hr.
Natural &
Model Propane (LP) Gas 40 50 60 70 60 90 100 110 120 130
GW-1000 990,000 GPH 2520 2016 1680 1440 1260 1120 1008 918 840 775
GW-1300 1,300,000 GPH 3309 2847 2208 1891 1655 1471 1324 1203 1103 1018
GW-1500 1,500,000 GPH 3818 3055 2545 2182 1909 1697 1527 1388 1273 1175
GW-1850 1,850,000 GPH 4709 3767 3139 2691 2355 2093 1884 1712 1570 1449
GW-2100 2,100,000 GPH 5345 4276 3564 3055 2673 2376 2138 1944 1782 1645
GW-2500 2,490,000 GPH 6338 5071 4225 3622 3169 2817 2535 2305 2113 1950
BTU Input/Output Boiler Rate of Flow and Pressure Drop
Genesis BTU Input/Output And Flow Rates
Input Rating BTU/Hr. Output Rating BTU/Hr. 20 Deg. F Rise 30 Deg. F Rise 40 Deg. F Rise Maximum Flow Rate Minimum Flow Rate
Natural & Natural & PD-Ft. PD-Ft. PD-Ft. PD-Ft. Deg.F PD-Ft. Deg.F
Model Propane (LP) Gas Propane (LP) Gas GPM Head GPM Head G PM Head GPM Head Rise GPM Head Rise
GW-1000 990,000 831,600 83 5.1 55 2.7 42 1.5 154 12.2 11 42 1.5 40
GW-1300 1,300,000 1,092,000 109 72 73 4.2 55 3.2 154 14.5 14 55 3.2 40
GW-1500 1,500,000 1,260,000 126 10.1 84 8.3 83 4.3 154 16.3 17 64 4.3 40
GW-1850 1,650,000 1,554,000 154 19 104 10.1 78 6.4 154 16.5 20 78 6.4 40
GW-2100 2,100,000 1,764,000 N/A N/A 116 14.5 68 8.3 154 21.3 23 89 8.3 40
GW-2500 2,490,000 2,091,600 N/A N/A 139 16.5 105 11.6 154 23.2 26 106 11.6 40
Note: Flow rates and pressure drops shown above are through the boiler only and include no field piping. The field piping must also be
considered when sizing system pumps.
Note: The standard factory supplied internal rear header mounted pump is sized for the boiler and up to additional 50 equivalent feet
of field piping.
A 012.16
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