Ratings
Notes:
1. Shield water heaters require special gas venting. Use
only the vent materials and methods specified in the
Shield Installation and Service Manual.
2. Standard Shield water heaters are equipped to operate
from sea level to 4,500 feet
only
with no adjustments.
The water heater will de-rate by 4% for each 1,000 feet
above sea level up to 4,500 feet.
3. High altitude Shield water heaters are equipped to
operate from 3,000 to 12,000 feet
only
with no field
adjustments. The water heater will de-rate by 2% for
each 1,000 feet above 3,000 feet. High altitude models
are manufactured with a different control module
for altitude operation, but the operation given in this
manual remains the same as the standard models. A
high altitude label (as shown in FIG. A) is also affixed
to the unit.
7
Maximum allowed working pressure is located on the rating plate.
Model Number
Note: Change “N”
to “L” for L.P. gas
models.
CSA
Input Modulation Btu/hr
(Note 2)
Water Content
Gallons
Water
Connections
Gas
Connections
Vent/Air Size
Min
Max
(Note 1)
SNR150-100
30,000 - 150,000
92
1-1/2"
1/2"
3"
SNR200-100
40,000 - 199,999
93
1-1/2"
1/2"
3"
SNA285-125
57,000 - 285,000
124
2"
3/4"
4"
SNA400-125
80,000 - 399,999
125
2"
1"
4"
SNA500-125
100,000 - 500,000
126
2"
1"
4"
NOTICE
Figure A High Altitude Label Location
UNIT EQUIPPED FOR
3,000 FT. TO 12,000 FT.
HIGH ALTITUDE
Installation & Service Manual
TM
HLW
