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Maximum Natural Gas Delivery Capacity - Length of Corrugated Stainless Steel Pipe in Feet
Pipe
Size
10
20
172
118
1/2"
3/4"
360
247
1"
678
466
1
1/4"
1390
957
1
2090
1430
1/2"
2"
4020
2760
Table 12 – Natural Gas Delivery Capacity – Black Iron Pipe – Refer to ANSI Z223.1 – National Fuel Gas
Code, Latest Edition
3. LP (Liquid Propane) Gas Pipe Sizing
The following is intended for use for piping between a Single or Second Stage (Low Pressure) Regulator and
the water heater. The following tables list maximum capacity of pipe in cubic feet of gas per hour for an inlet
pressure of 11 inches water column and specific pressure drop of 0.5 inches water column based on 1.5 spe-
cific gravity for liquid propane.
Maximum Liquid Propane Delivery Capacity - Length of Corrugated Stainless Steel Pipe in Feet
Pipe
Size
10
20
129
91
1/2"
303
216
3/4"
1"
605
425
1
971
661
1/4"
1
1/2"
1990
1400
2"
4640
3290
Table 13 – Liquid Propane Delivery Capacity – Corrugated Stainless Steel Pipe – Refer to ANSI Z223.1 – Na-
tional Fuel Gas Code, Latest Edition
Maximum Liquid Propane Delivery Capacity - Length of Black Iron Pipe (SCH. Metallic) in Feet
Pipe
Size
10
20
291
200
1/2"
3/4"
608
418
1"
1150
787
1
1/4"
2350
1620
1
3520
2420
1/2"
2"
6790
4660
Table 14 – Liquid Propane Delivery Capacity – Black Iron Pipe – Refer to ANSI Z223.1 – National Fuel Gas
Code, Latest Edition
B. GAS CONNECTION REQUIREMENTS
The gas connection fitting on the water heater is 3/4" female NPT. NOTE: The pipe size must not be less than
3/4".
2. The supply line must be sized for the maximum output of the water heater being installed. If there are
additional gas appliances from the main supply line, measure the size of the supply line according to the
COMBINED total maximum BTUH draw for the appliances as if they were operating at the same time.
Cubic Feet per Hour (0.60 Specific Gravity, 0.5 WC Pressure Drop)
30
40
50
95
81
72
199
170
151
374
320
284
768
657
583
1150
985
873
2220
1900
1680
Cubic Feet per Hour (0.60 Specific Gravity, 0.5 WC Pressure Drop)
30
40
50
74
64
58
177
153
137
344
297
265
528
449
397
1140
988
884
2680
2330
2080
Cubic Feet per Hour (0.60 Specific Gravity, 0.5 WC Pressure Drop)
30
40
50
160
137
122
336
287
255
632
541
480
1300
1110
985
1940
1660
1480
3750
3210
2840
60
80
100
65
56
50
137
117
104
257
220
195
528
452
400
791
677
600
1520
1300
1160
60
80
100
53
45
41
126
109
98
241
208
186
359
307
270
805
696
621
1900
1650
1480
60
80
100
110
101
94
231
212
197
434
400
372
892
821
763
1340
1230
1140
2570
2370
2200
150
200
40
34
83
71
157
134
322
275
482
412
928
794
150
200
31
28
75
69
143
129
217
183
506
438
1210
1050
150
200
84
67
175
140
330
265
677
543
1010
814
1950
1570
33
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