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ES2 Models
Boiler
Model
Input
MBH AFUE%
ES2-3 70 85.0
ES2-4 105 85.0
ES2-5 140 85.0
ES2-6 175 85.0
ES2-7 210 85.0
ES2-8 245 85.0
ES2-9 280 85.0
Models, Sizes, Efficiencies
ESC Models
Boiler
Model
Input
MBH AFUE%
ESC3 60 85.5
ESC4 91 85.4
ESC5 121 85.3
ESC6 152 85.2
ESC7 182 85.0
ESC8 212 84.5
ESC9 243 84.0
Series 3 Models
Boiler
Model
Input
MBH AFUE%
303 70 84.0
304 105 84.0
305 140 84.0
306 175 84.0
307 210 84.0
308 245 84.0
309 280 84.0
Series 2 Models
Boiler
Model
Input
MBH AFUE%
202 37.5 82.3
202-X 50 83.2
203 62 82.6
204 96 82.3
205 130 82.0
206 164 82.0
207 198 82.0
208 232 82.0
209 266 82.0
210 299 82.0
Independence/ Independence PV Models
Boiler Model Input MBH AFUE%
IN3/IN3PV 62 81.9
IN4/IN4PV 105 82.0
IN5/IN5PV 140 82.0
IN6/IN6PV 175 82.1
IN7 210 82.1
IN8 245 82.2
IN9 280 82.2
IN10 315 79.5*
IN11 349 79.5*
IN12 382 79.5*
*Thermal Efficiency
Cast Iron, Gas Boilers
Indirect Water Heaters
For complete technical specifications and dimension information on the products listed here,
please visit our website at www.usboiler.net
USBL13021
Condensing Boilers
www.usboiler.net
Alliance SL Models
Model
Storage
Capacity
(gal.)
Maximum First
Hour Rating at
135°F
(gal./hr.)
Continuous
Draw Rating at
135°F
(gal./hr.)
Standby Heat
Loss
(°F per hour)
AL27SL 27 192 162 0.97
AL35SL 35 200 162 0.72
AL50SL 50 225 171 0.56
AL70SL 70 294 217 0.45
AL119SL 119 339 235 0.39
U.S. Boiler Company also offers the Alpine
ultra-high efficiency condensing boiler, and
the new K2 high efficiency condensing boiler.
For information on these products, please see
product literature or visit www.usboiler.net
Before purchasing, read important information about estimated annual energy consumption, yearly operating cost, or
energy efficiency rating that is available from your retailer.