Brochure

Models, Sizes, Efficiencies
Cast Iron, Gas Boilers
Indirect Water Heaters
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please visit our website at www.usboiler.net
USBL13021
Condensing Boiler Family
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ultra-high efficency condensing boiler optons.
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Before purchasing, read important information about estimated annual energy consumption, yearly operating cost, or
energy efficiency rating that is available from your retailer.
ES2 Models
Boiler
Model
Input
MBH AFUE%
ES23 70 85.0
ES24 105 85.0
ES25 140 85.0
ES26 175 85.0
ES27 210 85.0
ES28 245 85.0
ES29 280 85.0
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%
202E 38 84.0
203E 69 84.0
204E 103 84.0
205E 138 84.0
206E 172 84.0
207E 207 84.0
208E 241 84.0
209E 276 84.0
Independence/
Independence PV Models
Boiler Model
Input
MBH
AFUE
1
%
IN3I/IN3PVNI 62 81.9
IN4I/IN4PVNI 105 82.0
IN5I/IN5PVNI 140 82.0
IN6I/IN6PVNI 175 82.1
IN7I 210 82.1
IN8I 245 82.1
IN9I 280 82.2
IN10 315 79.5*
IN11 349 79.5*
IN12 385 79.5*
*Thermal Efficiency
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 27 192 170 1.0
AL35SL 35 200 170 0.7
AL50SL 50 225 180 0.6
AL70SL 70 294 230 0.5
X-2 Models
Boiler
Model
Input
MBH AFUE%
X-203 70 84.0
X-204 105 84.0
X-205 140 84.0
X-206 175 84.0
X-207 210 84.0
X-208 245 84.0
X-209 280 84.0
1
Non PV models only