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INSTALLATION AND OPERATING INSTRUCTIONS
Table 11.3: Boiler Ratings
1. Net Ratings are based on DOE Heating Capacity less an allowance for normal piping and pickup as determined by the
Testing and Rating Standard for Low Pressure Cast Iron Heating Boilers of the Hydronics Institute. Steam ratings are based on
a piping and pickup factor of 1.33. Ratings shown are for elevations up to 2,000 feet. For elevations above 2,000 feet, ratings
should be reduced at the rate of 4% for each 1,000 feet above sea level.
2. Heating Capacity and Annual Fuel Utilization Efficiency (AFUE) ratings are based on U.S. Government tests. Before
purchasing this appliance, read important information about its estimated annual energy consumption or energy efficiency
rating that is vailable from your retailer.
Boiler
Sizes
Input,
MBH
Heating Capacity³
Net Ratings¹
AFUE²
Steam,
MBH
Steam,
sqft
Steam,
MBH
Steam,
%
88
88.5
74
233
56
83.0
118
118.0
98
308
74
82.6
147
147.5
123
383
92
82.6
177
177.0
147
458
110
82.4
206
206.5
171
533
128
82.3
236
236.0
196
613
147
82.2
288
287.5
238
746
179
82.0
Water
Content
Approx.
Shipping
Weight,
lb
Steam,
gal
9.3
465
9.3
465
10.8
576
10.8
576
12.4
700
12.4
700
13.9
812
