Installation & Operation Manual
8
Ratings
HLW
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. Use only
the vent materials and methods specified in the Genesis
Installation and Operation Manual.
Maximum allowed working pressure is located on the rating plate.
NOTICE
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.
Genesis
AHRI Rating
Model Number
Note: N = Natural, P =
Propane
Input
MBH
(Note 3)
Min Max
Gross
Output
MBH
(Note 1)
Net
AHRI
Ratings
Water,
MBH
GWH0400(N,P)
250
399
339
295
GWH0500(N,P)
250
500
425
370
GWH0650(N,P)
350
650
553
481
GWH0750(N,P)
400
750
638
555
GWH1000(N,P)
360
990
842
732
GWH1250(N,P)
720
1260
1071
931
GWH1450(N,P)
720
1440
1224
1064
GWH1800(N,P)
720
1800
1530
1330
GWH2100(N,P)
990
2070
1760
1530
Other Specifications
Appliance
Water
Content
Gallons
Water
Connections
Gas
Connections
Air / Vent
Sizes
(Note 2)
1.6
2"
1-1/4"
6"
1.7
2"
1-1/4"
6"
2.0
2"
1-1/4"
8"
2.1
2"
1-1/4"
8"
2.2
2-1/2"
2"
10"
2.6
2-1/2"
2"
12"
2.9
2-1/2"
2"
12"
3.3
2-1/2"
2"
12"/14"
3.6
2-1/2"
2"
12"/14"
