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Maximum delivery Capacity in Cubic Feet of Gas per Hour (based on IPS Pipe carrying Natural Gas with 0.60
Specific Gravity with a Pressure Drop of 0.5" W.C.).
Based on Energy Content of 1,000 BTU/Cubic ft: The water heater requires 120 Cubic ft/hr for the 140H model, 160 Cubic
ft/hr for the 240H model, 180 Cubic ft/hr for the 340H model, and 199 Cubic ft/hr for the 540H model.
The following tables are from NFPA 54.
Pipe Size
10'
20'
Diameter
(3 .0 m)
(6.1 m)
1/2"
172
118
3/4"
360
247
1"
678
466
1-1/4"
1,390
957
1-1/2"
2,090
1,430
2"
4,020
2,760
Maximum Capacity of Propane (LP) Based on 11" W.C. supply pressure at a 0.5" W.C. pressure drop
Pipe Size
10'
20'
Diameter
(3 .0 m)
(6.1 m)
268
184
1/2"
3/4"
567
393
1"
1,071
732
1-1/4"
2,205
1,496
1-1/2"
3,307
2,299
2"
6,221
4,331
Gas sizing example
(Natural Gas)
5' (1.5 m) Length
1-1/4" Pipe size
Based on Energy Content of 1,000 BTU/Cubic ft:
Divide each appliance's BTU/h requirement by 1,000 BTU/ft
Take into account the distance the appliance is from the gas meter, then look in the above gas chart to properly size the line.
For sections of the gas line supplying gas to more than one appliance (Ex: Point A to Point B), add up the cubic ft per hour
requirements of the appliances that are being supplied by that section, and size to the farthest appliance.
For Example: The section from A to B supplies gas to the furnace, range and dryer. Adding up the BTU/h requirements and
dividing by 1,000 yields a cubic ft per hour requirement of 220 cubic ft of gas per hour. The farthest appliance is the range,
which is 50 ft away from the meter. Looking at the above chart, and under the column of 50 ft, Section A to B needs to be
1" in order to supply 220 cubic ft.
-Natural gas supply piping-
30'
40'
50'
(9.1 m)
(12.2 m)
(15.2 m)
(18.3 m)
95
81
72
199
170
151
374
320
284
768
657
583
1,150
985
873
2,220
1,900
1,680
1,520
-Propane (LP) supply piping-
30'
40'
50'
(9.1 m)
(12.2 m)
(15.2 m)
(18.3 m)
148
126
112
315
267
237
590
504
448
1,212
1,039
913
1,858
1,559
1,417
1,275
3,465
2,992
2,646
2,394
Water
heater
199,000 BTU/h
5' (1.5 m)Length
1-1/4" Pipe size
A
Gas meter
31
Length
60'
70'
80'
90'
(21.3 m)
(24.4 m)
(27.4 m)
65
60
56
52
137
126
117
110
257
237
220
207
528
486
452
424
791
728
677
635
1,400
1,300
1,220
Length
60'
70'
80'
90'
(21.3 m)
(24.4 m)
(27.4 m)
101
93
87
82
217
196
185
173
409
378
346
322
834
771
724
677
1,181
1,086
1,023
2,205
2,047
1,921
10' (3 m)Length
15' (4.6 m)Length
3/4" Pipe size
1" Pipe size
B
10' (3 m )Length
10'(3 m)Length
1" Pipe size
3/4" Pipe size
Furnace
120,000 BTU/h
to get the appliance's ft
3
Page
Installation Manual
Installation
Unit: Cubic feet per hour
100'
125'
150'
(30.5 m)
(38.1 m)
(45.7 m)
50
44
40
104
92
83
195
173
157
400
355
322
600
532
482
1,160
1,020
928
Unit: kBTU per hour
100'
125'
150'
(30.5 m)
(38.1 m)
(45.7 m)
77
68
62
162
146
132
307
275
252
630
567
511
976
866
787
1,811
1,606
1,496
Dryer
35,000 BTU/h
10' (3 m)Length
1/2" Pipe size
15' (4.6 m)Length
1/2" Pipe size
C
Range
65,000 BTU/h
/h requirement.
3
200'
(61.0 m)
34
71
134
275
412
794
200'
(61.0 m)
53
112
213
440
675
1,260
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