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Independence® Gas-Fired Boiler

BOILER

NUMBER

AGA

INPUT

MBH (1)

DOE

HEATING

CAPACITY

MBH (1)(2)

I=B=R RATING (2)

AFUE

APPROX.

SHIPPING

WEIGHT

(LBS.)

MINIMUM

RECOMMENDED

CHIMNEY SIZE

ROUND

Dia. (In.) x Ht.(Ft.)

(4)(5)

24V

EI

WATER

MBH

STEAM

MBH

STEAM

SQ. FT.

WATER

STEAM

WATER

STEAM

IN3
IN4
IN5
IN6
IN7
IN8
IN9

62

105
140
175
210
245
280

51
87

115
144
173

202

231

44
76

100
125
150
176
201

38
65
86

108
130
152
174

158
271
358

450
542
633
725

81.0
81.3
81.6
81.8
82.1
81.1
81.4

80.0
80.0
80.3
80.6
80.9
80.0
80.3

83.1
83.1
83.1
83.2
83.2
83.2
83.2

81.9
82.0
82.0
82.1
82.1
82.2
82.2

350
420
485
555
620
690
760

4 x 15
5 x 15
6 x 15

 6 x 15(5)

7 x 15

7 x 15(5)

8 x 15

AGA/CGA

GROSS

OUTPUT

MBH

COMBUSTION EFFICIENCY (%)

WATER

STEAM

IN10(3)

 IN11(3)

IN12

315
349
385

259.87
287.92
317.62

226
250
276

195
216
239

812
900
996

83.5
83.5
83.5

82.5
82.5
82.5

815
885
955

  8x15(5)

9x15
9x15

* 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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