Burnham Independence IN4, Independence IN12, Independence IN3, Independence IN5, Independence IN7 Specification Sheet
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Independence® Gas-Fired Boiler
MINIMUM
RECOMMENDED
CHIMNEY SIZE
ROUND
Dia. (In.) x Ht.(Ft.)
(4)(5)
4 x 15
5 x 15
6 x 15
6 x 15(5)
7 x 15
7 x 15(5)
8 x 15
8x15(5)
9x15
9x15
BOILER
NUMBER
IN3
IN4
IN5
IN6
IN7
IN8
IN9
IN10(3)
IN11(3)
IN12
AGA
INPUT
MBH (1)
62
105
140
175
210
245
280
315
349
385
DOE
HEATING
CAPACITY
MBH (1)(2)
51
87
115
144
173
202
231
AGA/CGA
GROSS
OUTPUT
MBH
259.87
287.92
317.62
I=B=R RATING (2)
WATER
MBH
STEAM
MBH
44
76
100
125
150
176
201
226
250
276
AFUE
24V EI
STEAM
SQ. FT. WATER STEAM WATER STEAM
38
65
86
108
130
152
174
195
216
239
158
271
358
450
542
633
725
812
900
996
81.0
81.3
81.6
81.8
82.1
81.1
81.4
COMBUSTION EFFICIENCY (%)
80.0
80.0
80.3
80.6
80.9
80.0
80.3
WATER STEAM
83.5
83.5
83.5
83.1
83.1
83.1
83.2
83.2
83.2
83.2
82.5
82.5
82.5
81.9
82.0
82.0
82.1
82.1
82.2
82.2
APPROX.
SHIPPING
WEIGHT
(LBS.)
350
420
485
555
620
690
760
815
885
955
* LP available on IN3-IN9
1. Ratings shown are for installations at sea level and elevations up to 2,000 ft. For elevations
above 2,000 ft., ratings should be reduced at the rate of four percent (4%) for each 1,000 ft.
above sea level.
2. Capacities, outputs and ratings are based on steam combustion efficiency of 82.5%. Water
combustion efficiency is 83.5%.
3. For Canadian builds only: Reduce input and output and by 3%.
4. 15 ft. height is measured from top of drafthood to top of chimney.
5. IN6, IN8, & IN10 - Canada only: Increase chimney diameter by 1".
Working Pressure: 15 PSI Steam; 30 PSI Water
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