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Ratings
Model Number
Note: N = Natural, P =
Propane
Min
GWH0400(N,P)
250
GWH0500(N,P)
250
GWH0650(N,P)
350
GWH0750(N,P)
400
GWH1000(N,P)
360
GWH1250(N,P)
720
GWH1450(N,P)
720
GWH1800(N,P)
720
GWH2100(N,P)
990
Maximum allowed working pressure is located on the rating plate.
NOTICE
Notes:
1. The ratings are based on standard test procedures prescribed
by the United States Department of Energy.
2. Genesis models require special gas venting.
the vent materials and methods specified in the Genesis
Installation and Operation Manual.
8
Genesis
AHRI Rating
Gross
Input
Output
MBH
MBH
(Note 3)
Max
(Note 1)
399
339
500
425
650
553
750
638
990
842
1260
1071
1440
1224
1800
1530
2070
1760
Use only
Installation & Operation Manual
Other Specifications
Net
AHRI
Ratings
Appliance
Water,
Water
MBH
Content
Connections
Gallons
295
1.6
370
1.7
481
2.0
555
2.1
732
2.2
931
2.6
1064
2.9
1330
3.3
1530
3.6
3. The Genesis water heater is orificed for operation up to
2000 feet altitude, and including up to 4,500 feet, with no
field adjustments. The appliance will de-rate by 4% for
each 1000 feet above sea level up to 4,500 feet. Consult the
factory for installations above 4,500 feet elevation.
HLW
Air / Vent
Water
Gas
Sizes
Connections
(Note 2)
2"
1-1/4"
6"
2"
1-1/4"
6"
2"
1-1/4"
8"
2"
1-1/4"
8"
2-1/2"
2"
10"
2-1/2"
2"
12"
2-1/2"
2"
12"
2-1/2"
2"
12"/14"
2-1/2"
2"
12"/14"
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