A.O. Smith GWH-400N, GWH-500N, GWH-650N, GWH-750N, GWH-1000N User Manual
...
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
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AOSCG25200
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
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