15
Connecting the Gas Supply
Connecting the Gas Supply
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 water heater 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 specific gravity at a 0.5" WC pressure drop.
Page Size
kBTU/H of Natural Gas
Length
10'
20'
30'
40'
50'
60'
70'
80'
90'
100'
125'
150'
200'
3/4"
372
255
205
175
156
142
130
121
114
107
95
86
74
1"
702
482
387
331
293
266
245
228
213
202
179
162
139
1 1/4"
1441
990
795
680
603
546
503
468
439
415
367
332
285
1 1/2"
2158
1483
1191
1019
903
819
753
701
658
621
550
499
427
2"
4155
2856
2293
1963
1740
1576
1450
1349
1266
1195
1060
960
822
Liquid propane gas
Maximum Capacity of propane (LP) Gas Based on 11" WC supply pressure at a 1.0" WC pressure drop.
Page Size
kBTU/H of Propane Gas
Length
10'
20'
30'
40'
50'
60'
70'
80'
90'
100'
125'
150'
200'
3/4"
567
393
315
267
237
217
196
185
173
162
146
132
112
1"
1071
732
590
504
448
409
378
346
322
307
275
252
213
1 1/4"
2205
1496
1212
1039
913
834
771
724
677
630
567
511
440
1 1/2"
3307
2299
1858
1559
1417
1275
1181
1086
1023
976
866
787
675
2"
6221
4331
3465
2992
2646
2394
2205
2047
1921
1811
1606
1496
1260
Summary of Contents for VH-150
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