Commercial Gas Boilers
Revised November 2008
PG 3 OF 4
www.hotwater.com
AOSDG25200
OTHER GENESIS
®
FEATURES
FACTORY-INSTALLED CIRCULATING PUMP
Pre-wired, integrally controlled by EMC-5000 control
Adjustable pump time delay allows removal of usable residual
heat during stand-by cycle, virtually eliminating stand-by heat loss
ASME PRESSURE RELIEF VALVE 125#
FACTORY INSTALLED FLOW SWITCH
ALTERNATE THERMOSTAT TERMINALS (24V)
MANUAL RESET HIGH LIMIT
BLOCKED FLUE SWITCH
BLOCKED INLET SWITCH
AIR PROVING SWITCH
GENESIS
®
OPTIONS
CSD-1 CODE
NEW YORK CODE
CALIFORNIA CODE
ALARM BELL
ALL-BRONZE CIRCULATING PUMP
HARD WATER PUMP
BRONZE HEADERS
STACK RACK
LOW WATER CUT-OFF
EXTENDED VENTING KIT
SEQUENCING CONTROL PANEL (FOR 2-8 BOILERS)
COMBUSTIBLE FLOOR SHIELD
DRY CONTACTS FOR ANY BOILER FAILURE
CUPRO-NICKEL HEAT EXCHANGER
CSA CERTIFIED VENT KIT
GENESIS
®
VENTING VERSATILITY
DIRECT-VENTING
SIDEWALL VENTING
CONVENTIONAL VENTING
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
BTU INPUT
PER HOUR
RECOVERY — GALLONS PER HOUR AT °F TEMPERATURE RISE
40°
50°
60°
70°
80°
90°
100°
110°
120°
130°
140°
GW/GWO-300
300,000
761
609
507
435
380
338
304
277
254
234
217
GW/GWO-400
399,900
1014
811
676
580
507
451
406
369
338
312
290
GW/GWO-500
500,000
1268
1015
845
725
634
564
507
461
423
390
362
GW/GWO-650
650,000
1649
1319
1099
942
824
733
659
600
600
507
471
GW/GWO-750
750,000
1902
1522
1268
1087
951
845
761
692
634
585
544
Gas Supply Pressure: 13.8” W.C. maximum natural and propane; 4.5” W.C. minimum natural; 11.0” W.C. minimum propane.
Genesis boilers are approved for installation on noncombustible flooring in an alcove with minimum clearance to combustibles of:
3 inches sides, and back; 3 inches top, front alcove; 6 inches vent.
For installation on combustible flooring use the optional Combustible Floor Kit.
Genesis boilers must be connected to a single phase dedicated line source that is: 120 volts, 60 hertz and 20 amps.
July 2011R
238403_AOSDG25200.indd 3
238403_AOSDG25200.indd 3
7/21/11 1:27 PM
7/21/11 1:27 PM
