MODEL
NUMBER
FIRST
HOUR
RATING
GALLON
CAPACITY
RECOVERY
90°F RISE
PER HOUR
ENERGY
FACTOR
BTU INPUT
PER HOUR
NATURAL†
R
VALUE A B C D E F
APPROX.
SHIPPING
WEIGHT
GCVT-40 88 38 48 0.60 50,000 16 58-1/2 54-3/4 20-1/2 13-3/8 848-7/8 4
GCVT-50 90 48 51 0.58 50,000 860-7/8 56-1/2 20 13-3/8 850-3/8 4
GCVX-50 93 50 67 0.58 65,000 16 63-7/8 59-1/2 22 15-1/2 854-1/8 4
GCV-65 116 65 67
0.57
65,000
16
65 60 24 15-1/2 8 54-1/4 4
FCG-75* N/A 74 81 N/A 75,100 16 61 57 26-1/2 14-3/4 16 50-1/4 4
FCG-100* N/A 98 81 N/A 75,100 10 68-1/2 65 27-3/4 15-3/16 16 57-3/8 4
138
172
195
215
275
350
HOT CONNECTION
COLD
CONNECTION
ANODE ROD*
E
*Location for optional top-mounted
T&P Valve if ordered from factory.
BA
F
D
1/2" GAS
CONNECTION
T&P VALVE
C
(C3 models only)
Corderite Combustion Containment (C3) design meets American National
Standards Institute standards (ANS Z21.10.1) that deal with the accidental or
unintended ignition of flammable vapors, such as those emitted by gasoline.
Covered by four U.S. patents, C3 Technology gas water heaters feature a sealed
combustion chamber with air intake screen and a fireproof Corderite flame
arrestor built into the water heater base. In addition, a thermal cutoff (TCO)
device, integral with the thermocouple, is designed to shut off gas flow to the
burner and pilot if poor combustion is detected.

Flammable Vapor Ignition

Resistant C3 Technology®

Water Heaters

If flammable vapors
accidentally enter the
combustion chamber,
the Corderite flame
arrestor is designed
so flames burn off
the top surface and
cannot escape down
through the arrestor.
A.Easy-to-light
piezo igniter
B.View port for easy
burner inspection
inside sealed
combustion chamber
Recovery capacity based on actual performance tests. Water Connections – 1" on 75-gallon model,1-1/4" on 100-gallon model, 3⁄4" on all other models.
* Not equipped with C3 Technology. 75 and 100 gallon models have factory installed (non heat trap) nipples, 75-gallon model has 80% efficiency,
998 BTU/hr. standby loss; 100-gallon model has 80% efficiency,1146 BTU/hr. standby loss.
† Propane Gas – GCVT-40: 47,000 BTU input; GCVT-50:45,000 BTU input; GCVX-50: 55,000 BTU input; GCV-65: 62,500 BTU input.
For 10-Year Tank and 6-Year Parts Warranty,change “G” to “X” in Model Number (example:XCVT-40), or change “F” to “P”in model number (example:PCG-75).
DIMENSIONS (INCHES)
DRAFT
HOOD
OUTLET
(LBS)
(GPH)

www.hotwater.com

For Technical Information and Automated Fax Service, call 800-527-1953. A.O. Smith Corporation reserves the right to make product changes or improvements without prior notice.
Residential Gas Water Heaters
Revised September 2008 Page 2 of 2
AOSRG45400
The standard FVIR models are certified for installations to 7700 feet elevation. For high attitude versions of the 75 & 100-gallon models add SMR “S19”
199320_AOSRG45400.indd 2199320_AOSRG45400.indd 2 9/4/08 12:11:17 PM9/4/08 12:11:17 PM