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42
*Recover rating based on 81% thermal efficiency.
**Recover rating based on 80% thermal efficiency.
†The GCN-75 comes standard with side loop fittings for use with hydronic heating
applications.
K
HOT WATER
OUTLET
DRAIN
VALVE
HOT
COLD
TOP VIEW
L
GAS INLET
DRAIN VALVE
K
COLD WATER
INLET
F
H
J
B
D
A
E
M
G
TEMPERATURE
AND PRESSURE
RELIEF VALVE
C
K
HOT WATER
OUTLET
DRAIN
VALVE
HOT
COLD
TOP VIEW
L
GAS INLET
DRAIN VALVE
K
COLD WATER
INLET
F
H
J
B
D
A
E
M
G
TEMPERATURE
AND PRESSURE
RELIEF VALVE
C
Model
Number
Gallon
Capacity
Recovery @ 90°F
Rise Gallon Per Hour
BTU Input
Per Hour
Approx.
Shipping Weight
† GCN-75
74 81 75,100 285 lbs
GCN-100
98 82 75,100 350 lbs
Dimensions in Inches
Model G H J K L M
GCN-75
15-1/4 16 2 1 1/2 12-1/2
GCN-100
15-3/4 16 1-1/4 1-1/4 1/2 11-15/16
Dimensions in Inches
Model A B C D E F
GCN-75
62-1/16 58 29-1/2 25-1/4 15-7/8 4
GCN-100
70-1/2 66-1/2 30-15/16 27-3/4 15-3/16 4