Install Instructions

9
Ratings (continued)
Notes:
1. Copper-fins require special gas venting. Use only
the vent materials and methods specified in the
Installation and Service Manual.
2. The Copper-fin is orificed for operation up to 2000
feet altitude. The ap pli ance will be derated 4% per
1000 feet above 2000 feet el e va tion. Consult the
factory for installations above 2000 feet elevation.
Figure B High altitude label location_water heater
HIGH ALTITUDE
LABEL
Copper-fin Specifications
Model Number
Note: Change “N” to
“L” for L.P. gas models
Input
MBH
Water
Content Gallons
Water Connections Gas Connections
Vent Size
(Note 1)
CWN497
495 1.9 2" 1 1/4" 6"
CWN647
645 2.0 2" 1 1/4" 8"
CWN747
745 2.4 2" 1 1/4" 8"
CWN987
985 3.3 2 1/2" 2" 10"
CWN1257
1255 3.5 2 1/2" 2" 12"
CWN1437
1435 3.7 2 1/2" 2" 12"
CWN1797
1795 4.1 2 1/2" 2" 14"
CWN2067
2065 4.3 2 1/2" 2" 14"
Maximum allowed working pressure is located on the rating plate.
NOTICE
HLW
Installation & Service Manual
LOW LEAD CONTENT