25
Gas Supply Piping
This unit needs a manual gas control valve (shut-off valve) that must be connected to the unit before the gas
line.
Check the gas inlet pressure and the type of gas matching the rating plate located on your water heater. Also
check to make sure your gas meter is capable of supplying sufficient BTU load to all appliances. Insufficient
gas pressure and volume will cause your water heater to be deficient in performance and may not work
properly.
When connections are completed, check for gas leaks by applying soapy water to all gas fittings and
connections. Presence of soap bubbles foaming is a sign of gas leaks.
This appliance and its individual shut-off valve must be isolated from the gas supply piping system by
unplugging the unit and turning off the main gas valve during any pressure testing of the gas supply piping
system at test pressures equal to or less than 1/2 PSI.
When measuring the inlet supply pressure, the water heater and all other gas appliances sharing the gas supply
line must be firing at maximum capacity.
Maximum gas pressure must not exceed listed value.
Low gas pressure could be caused by an undersized gas pipe; this will cause the water heater's performance to
diminish and it would not be able to reach maximum performance.
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Size gas piping system correctly following ANSI Z223.1/NFPA 54, or by local code.
Based on 0.60 specific gravity for natural gas at 0.5 "W.C. pressure drop DOE standard is 1100 BTU per cubic ft. of natural gas
Based on 11 "W.C. supply pressure
Gas Piping System Codes
NATURAL GAS SUPPLY PIPING
PROPANE GAS SUPPLY PIPING
Recommended Gas Pipe Size
( Diameter, for Natural Gas)
Distance from gas meter
Pipe size(inches)
0 ft. to 20 ft.
1/2 inch
20 ft. to 60 ft.
3/4 inch
60 ft. to 100 ft.
1 inch
Pipe
Cubic Feet of Natural Gas
size
Length
10’
20’
30’
40’
50’
60’
70’
80’
90’
100’
125’
150’
200’
1/2"
174
119
96
82
73
66
61
56
53
50
44
40
34
3/4"
363
249
200
171
152
138
127
118
111
104
93
84
72
1"
684
470
377
323
286
259
239
222
208
197
174
158
135
1 1/4"
1404
965
775
663
588
532
490
456
428
404
358
324
278
1 1/2"
2103 1445
1161
993
880
798
734
683
641
605
536
486
416
2"
4050 2784 2235 1913 1696 1536 1413 1315 1234
1165 1033
936
801
Pipe
KBTU of Propane Gas
size
Length
10’
20’
30’
40’
50’
60’
70’
80’
90’
100’
125’
150’
200’
1/2"
276
190
153
130
115
104
97
90
84
79
70
64
56
3/4"
568
394
316
268
238
218
197
186
174
163
147
133
112
1"
1072
733
591
505
449
410
379
347
323
308
276
253
213
1 1/4"
2206 1497 1213 1040
914
835
772
725
678
631
567
511
440
1 1/2"
3308 2300 1859 1560 1418 1276
1182 1087 1024
977
867
788
676
2"
6222 4332 3466 2993 2647 2395 2206 2048 1922 1812 1607 1496 1260
NOTICE
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