A.O. Smith FCG-75, FCG-100 User Manual
COMMERCIAL-GRADE
RESIDENTIAL GAS WATER HEATERS
PROLINE® HIGH RECOVERY
ATMOSPHERIC VENT 75 & 100 GALLON
COMMERCIAL-GRADE RESIDENTIAL
HIGHEST RECOVERIES
• Capacity/ input combinations up to 98
gallons/75,100 BTU’s produce recoveries
up to 81 gallons per hour
FULLY AUTOMATIC CONTROLS WITH
SAFETY SHUTOFF
• Accurate, dependable control system
requires no electric connections. Fixed
automatic gas shutoff device for added
safety.
GREEN CHOICE® GAS BURNER
• Patented eco-friendly burner design
reduces NOx emissions by up to 33%
and complies with Low- NOx emission
requirements of 40 ng/J.
DYNACLEAN™ DIFFUSER DIP TUBE
• Reduces lime and sediment buildup and
maximizes hot water output. Made from
long-lasting PEX cross-linked polymer.
COREGARD™ ANODE ROD
• Our anode rods have a stainless steel
core that extends the life of the anode
rod allowing superior tank protection far
longer than standard anode rods.
PUSH-BUTTON PIEZO IGNITOR
• Makes lighting the pilot fast and easy
with one-hand push-button spark
ignition (Natural gas only).
NIPPLES
• Factory-installed for faster installation.
BLUE DIAMOND® GLASS COATING
• Provides superior corrosion resistance
compared to industry standard glass
lining.
ENHANCED-FLOW BRASS DRAIN
VALVE
• Our residential water heaters have a
solid brass, tamper resistant, enhancedflow,ball type, drain valve.
• Uses a standard female hose fitting
that allows for fast and easy draining
during maintenance.
• Designed for easy operation, this valve
includes an integral screwdriver slot
that features a 1/4 turn (open/close)
radius, which not only permits full
straight-through water flow but also a
quick and positive shut off
CODE COMPLIANCE
• Meets UBC, CEC and ICC National
Codes.
• Meets the thermal efficiency and
standby loss requirements of the
U.S. Department of Energy and current
edition of ASHRAE/IES 90.1.
CSA CERTIFIED AND ASME RATED
T&P RELIEF VALVE
MAXIMUM HYDROSTATIC WORKING
PRESSURE 150 PSI
DESIGN-LISTED BY CSA
INTERNATIONAL
• Certified at 300 psi test pressure and
150 psi working pressure.
• Listed according to ANSI Z21.10.3 CSA
4.3 standards governing storage tanktype gas water heaters.
6-YEAR LIMITED TANK AND PARTS
WARRANTY
• For complete information, consult
written warranty or go to hotwater.com
© January 2017 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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AOSRG47002
COMMERCIAL-GRADE
RESIDENTIAL GAS WATER HEATERS
Model
Number
FCG-75 74 75,100 81 61 58-1/2 26-1/2 15-3/16 16 50-1/4 15-1/2 50-1/4 4 275
FCG-100 98 75,100 81 68-1/2 66-1/2 27-3/4 15-3/16 16 57-3/8 N/A N/A 4 350
Water connections - 1” on FCG-75 and 1-1/4” on FCG-100
For 10-year tank and 6-year parts limited warranty, change “F” to “P” in model number (example: PCG-75).
For optional side-mounted recirculating taps, add “L” to the suffix of the model number (example: FCG-75L).
All models are certified from sea level to 7,700 ft. elevation.
Dimensions and specifications subject to change without notice in accordance with our policy of continuous product improvement.
Gallon
Capacity
BTU Input
Natural Gas
HOT WATER
INLET
Recovery @
90°F Rise
Gallon Per
Hour
COLD WATER
A B C D E F G H
INLET
Dimensions in Inches
TOP VIEW
Draft
Hood
Approx.
Shipping
Weight (lbs)
E
T&P
DRAIN
VALVE
C
TEMPERATURE
AND PRESSURE
RELIEF VALVE
HOT
COLD
F
B
H
A
DRAIN VALVE
GAS INLET
D
G
FRONT VIEW
For technical information call 800-527-1953. A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice.
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AOSRG47002www.hotwater.com | 800-527-1953 Toll-Free USA
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