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5 Connecting the Gas Supply
5.1 Gas Pipe Sizing Tables
Gas pipe sizing is based on the gas type, supplied gas pressure, pressure drop in
the system, and gas line type. The tables below are for reference only (when the
gas supply is piping straight to the boiler with no connections to any other gas
appliances). For gas pipe sizing, refer to the latest National Fuel Gas code, NFPA 54
and consult the gas pipe manufacturer for actual gas pipe capacities.
Natural Gas
Maximum Capacity of Natural Gas Based on a 0.60 specifi c gravity at a 0.5" WC
pressure drop.
Pipe Size
Length
10'
20'
3/4"
360
247
1"
678
466
1 1/4"
1390
957
1 1/2"
2090
1430
2"
4020
2760
2 1/2"
6400
4400
3"
11300
7780
4"
23100
15900
Table 6 For less than 6" WC supply pressure.
Maximum Capacity of Natural Gas Based on a 0.60 specifi c gravity at a 3.0" WC
pressure drop.
Pipe Size
Length
10'
20'
1/2"
454
312
3/4"
949
652
1"
1790
1230
1 1/4"
3670
2520
1 1/2"
5500
3780
2"
10600
7280
2 1/2"
16900
11600
3"
29800
20500
4"
60800
41800
Table 7 For 6" WC or greater supply pressure.
Liquid Propane Gas
Maximum Capacity of propane (LP) Gas Based on 11" WC supply pressure at a 0.5"
WC pressure drop.
Pipe Size
Length
10'
20'
1/2"
291
200
3/4"
608
418
1"
1150
787
1 1/4"
2350
1620
1 1/2"
3520
2420
2"
6790
4660
Table 8
Singular Combi Boiler - BTC 439003301 B (2021/07)
30'
40'
50'
60'
199
170
151
137
374
320
284
257
768
657
583
528
1150
985
873
791
2220
1900
1680
1520
3530
3020
2680
2430
6250
5350
4740
4290
12700
10900
9660
8760
30'
40'
50'
60'
250
214
190
172
524
448
397
360
986
844
748
678
2030
1730
1540
1390
3030
2600
2300
2090
5840
5000
4430
4020
9310
7970
7060
6400
16500
14100
12500
11300
33600
28700
25500
23100
30'
40'
50'
60'
160
137
122
110
336
287
255
231
632
541
480
434
1300
1110
985
892
1940
1660
1480
1340
3750
3210
2840
2570
kBTU/H of Natural Gas
70'
80'
90'
126
117
110
237
220
207
486
452
424
728
677
635
1400
1300
1220
2230
2080
1950
3950
3670
3450
8050
7490
7030
kBTU/H of Natural Gas
70'
80'
90'
158
147
138
331
308
289
624
580
544
1280
1190
1120
1920
1790
1670
3690
3440
3230
5890
5480
5140
10400
9690
9090
21200
19800
18500
kBTU/H of Propane Gas
80'
100'
125'
101
94
89
212
197
185
400
372
349
821
763
716
1230
1140
1070
2370
2200
2070
Installation Instructions
100'
125'
150'
200'
104
92
83
71
195
173
157
134
400
355
322
275
600
532
482
412
1160
1020
928
794
1840
1630
1480
1270
3260
2890
2610
2240
6640
5890
5330
4560
100'
125'
150'
200'
131
116
105
90
273
242
219
188
514
456
413
353
1060
936
848
726
1580
1400
1270
1090
3050
2700
2450
2090
4860
4300
3900
3340
8580
7610
6890
5900
17500
15500
14100
12000
150'
175'
200'
250'
84
74
67
62
175
155
140
129
330
292
265
243
677
600
543
500
1010
899
814
749
1950
1730
1570
1440
| 25
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