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Bosch 125B LP Installation And Operating Instructions Manual page 11

Automatic instantaneous type water heaters for use with natural and liquefied petroleum gas
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GAS PIPING, CONNECTIONS and Gas Regulator
Before connecting the gas supply, check the rating plate on the right side of the front cover to be sure that the heater is
rated for the same gas to which it will be connected.
In the United States: The installation must conform with local codes or, in the absence of local codes, the National Fuel
Gas Code ANSI Z223. 1 /NFPA 54.
In Canada: The Installation should conform with CGA B149 INSTALLATION CODES and /or local installation codes.
FOR NATURAL GAS
Maximum Capacity of pipe in Cubic Feet of Gas per Hour
for Gas Pressure of 0.5 Psig or less and a Pressure drop of
0.3 in Water Column.
(Based on a 0.60 Specific Gravity Gas) Btu numbers given
in thousands.
Nominal
Iron
Pipe
Internal
Size,
Diameter
inches inches
10
1/4
0.364
32
3/8
0.493
72
1/2
0.622
132
3/4
0.824
278
1
1.049
520
1 1/4
1.380
1050
1 1/2
1.610
1600
2
2.067
3050
2 1/2
2.469
4800
3
3.068
8500
4
4.026
17,500 12,000 9,700 8,300
FOR LP GAS
Maximum Capacity of Pipe in Thousands of
BTU per Hour of Undiluted Petroleum Gases
(at 11 inches Water Column Inlet Pressure)
(Based on a Pressure Drop of 0.5 Inch Water
Column).
Maximum Capacity of Semi-Rigid
Tubing in Thousands of BTU per Hour of
Undiluted Liquified Petroleum Gases (at 11
inches Water Column Inlet Pressure)
(Based on a Pressure Drop of 0.5 Inch Water
Column)
* Source National Fuel Gas Code NFPA 54, ANSI Z223. 1 - No
Additional Allowance is necessary for an ordinary number of fittings
6 720 607 030
GAS LINE SIZING
Length of Black Iron Pipe, Feet
20
30
40
50
22
18
15
14
49
40
34
30
92
73
63
56
190
152
130
115
350
285
245
215
730
590
500
440
1100
890
760
670
2100
1650
1450
1270 1150 1050
3300
2700
2300
2000 1850 1700
5900
4700
4100
3600 3250 3000
7,400 6,80 6,200 5,800 5,400 5,100 4,500
Nominal
Iron Pipe
Size,
Inches
Outside
Diameter,
Inch
Follow boxed numbers for piping just one Aquastar 125B
(example: 3/4" B.I. Natural Gas pipe for 30 ft. will handle
152,000 btu's). For multiple appliances combine the total
btu input load and then refer to applicable chart below.
60
70
80
90
12
11
11
10
27
25
23
22
50
46
43
40
105
96
90
84
195
180
170
160
400
370
350
320
610
560
530
490
990
930
1600
1500
2800
2600
Black Iron Pipe
Length of Pipe, Feet
10
20
30
40
50
1/2
275 189 152
129 114 103
3/4
567 693 315
267 237 217 196 185 173
1
107 732 590
504 448 409 378 346 322
1 1/4
220 149 121
103 913 834 771 724 677
1 1/2
330 229 185
155 141 127 118 108 102
2
622 433 346
299 264 239 220 204 192 1811 1606 1496
Length of Tubing, Feet
10
20
30
3/8
39
26
21
1/2
92
62
50
5/8
199 131
107
3/4
329 216
181 145
7/8
501 346
277 233
100
125
150
175
9
8
8
7
21
18
17
15
38
34
31
28
79
72
64
59
150
130
120
110
305
275
250
225
460
410
380
350
870
780
710
650
1400
1250
1130
1050
2500
2200
2000
1850 1700
4,100 3,800 3500
60
70
80
90
100
96
89
83
78
162
307
630
976
Copper
40
50
60
70
80
90
19
_
_
_
_
41
37
35
31
29
27
90
79
72
67
62
59
131
121 112 104
95
198
187 164 155 146 138
200
6
14
26
55
100
210
320
610
980
125
150
69
63
146
132
275
252
567
511
866
787
100
_
_
26
55
90
11

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