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Bosch Pro Tankless GWH-450-ES Series Manual page 17

Temperature modulated with electronic ignition - normal duty suitable for recirculating potable water only
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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 (0.75mbar).(Based on a 0.60 Specific Gravity Gas) Btu numbers given in thousands.
Follow boxed numbers for piping just one GWH-345/450-ESR (example: ¾" B.I. Natural Gas pipe for 20 ft
(6. 1 m). will handle 190,000 btu's (55.7 kWh). For multiple appliances combine the total btu input load and
then refer to applicable chart below.
Nominal
Iron
Pipe
Internal
Size,
Diameter
inches inches
10
20
1/4
0.364
32
22
3/8
0.493
72
49
1/2
0.622
132
92
3/4
0.824
278
190
1
1.049
520
350
1 1/4
1.380
1050
730
1 1/2
1.610
1600
1100
2
2.067
3050
2100
Length of Flexible Corrugated Stainless Steel Tubing (CSST), Feet
Tube
size,
inches
EHD*
10
20
1/2
18 EHD 82
58
3/4
23 EHD 161
116
1
30 EHD 330
231
188
1 1/4
37 EHD 639
456
374
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).
Nominal
iron
pipe
10
20
30
Inches
1/2
291 200 160 137 122 110 94
3/4
608 418 336 287 255 231 197 175
1
1145 787 632 541 480 434 372 330
Maximum
Capacity
of
corrugated) Tubing in Thousands of BTU per Hour of
Undiluted Liquefied 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
Fig. 21
6 720 607 915
Length of Black Iron Pipe, Feet
30
40
50
60
18
15
14
12
40
34
30
27
73
63
56
50
152
130
115
105
285
245
215
195
180
590
500
440
400
370
890
760
670
610
560
1650 1450
1270 1150 1050
30
40
50
60
47
41
37
34
96
83
75
68
162
144
131
* EHD = Equivalent Hydraulic Diameter. The greater the
value of EHD, the greater the gas capacity of the tubing
325
292
267
Black Iron Pipe
Length of Pipe, Feet
40
50
60
80
100
84
Semi-Rigid
(flexible,
70
80
90
100
125
11
11
10
9
8
25
23
22
21
18
46
43
40
38
34
96
90
84
79
72
170
160
150
130
350
320
305
275
530
490
460
410
990
930
870
780
* EHD = Equivalent Hydraulic Diameter. The greater the
value of EHD, the greater the gas capacity of the tubing.
Length of Flexible Corrugated Stainless Steel Tubing (CSST), Feet
Tube
size
inches
125
150
200
1/2
74
67
58
155
140
120
3/4
292
265
227
1
1 1/4
non
Outside
diameter
Inch
10
20
3/8
39
26
1/2
92
62
5/8
199 131
3/4
329 216
Installation instructions
150
175
200
8
7
6
17
15
14
31
28
26
64
59
55
120
110
100
250
225
210
380
350
320
710
650
610
.
EHD*
10
20
30
40
18 EHD 129
91
74
64
23 EHD 254
183
151
131
30 EHD 521
365
297
256
37 EHD 971
661
528
449
Copper
Length of Tubing, Feet
30
40
50
60
70
80
21
19
_
_
_
50
41
37
35
31
29
107
90
79
72
67
62
181 145 131
121 112 104 95
50
60
58
53
118
107
227
207
397
359
90 100
_
_
_
27
26
59
55
90
17

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