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Gas Supply Piping
Check the rating plate to make sure that the unit
was built for the type of gas available in the area.
The gas supply piping should be sized according
to the Applicable Plumbing Code for a maximum
draw of 190,000 BTUH. First determine the
effective length of the gas supply line by
measuring the actual length of piping, and then
adding 5 ft. for every elbow or "Tee" to the actual
length. Use the charts below to determine the pipe
diameter necessary to accommodate the BTU
demand of the unit. If there are more than one gas
drawing appliances on the line, size according to
the maximum amount of BTU demand. The gas
supply pressures must be within the ranges of the
following chart:
Natural Gas
Supply Pressure
Propane Gas
Supply Pressure
Insufficient gas supply pressure can cause the
Flash Water Heater to lose efficiency or not work
at all.
Based on 0.60 specific gravity for natural gas at .5" WC pressure drop
Pipe
Size
Length
10'
20'
½"
174
119
¾"
363
249
1"
684
470
1 ¼"
1404
965
1 ½"
2103
1445
2"
4050
2784
Pipe
Size
Length
10'
20'
½"
275
189
¾"
567
393
1"
1071
732
1 ¼"
2205
1496
1 ½"
3307
2299
2"
6221
4331
Min. 5" WC
Max. 10.5" WC
Min. 11" WC
Max. 14" WC
Natural Gas Supply Piping
DOE standard is 1100 BTU per cubic ft. of natural gas
30'
40'
50'
96
82
73
200
171
152
377
323
286
775
663
588
1161
993
880
2235
1913
1696
Propane Supply Piping
Based on 11" WC supply pressure
30'
40'
50'
152
129
114
315
267
237
590
504
448
1212
1039
913
1858
1559
1417
3465
2992
2646
WARNING:
maximum supply pressures are exceeded. The
manifold gas pressure should be at maximum 2.6"
WC for natural gas, and 3.4" WC for propane.
Always use approved connectors to connect the
unit to the gas line. Always purge the gas line of
any debris before connecting to the water heater.
WARNING
gas to propane or propane to natural gas cannot
be done in the field. Contact your local retailer or
distributor to get the correct unit for your gas type.
Always install a manual shutoff valve on the gas
supply line in case of an emergency, or if service
or maintenance is necessary.
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 ½ PSI.
When all of the connections have been made,
check the gas line for leaks. Apply soapy water to
all gas fittings and connections, if bubbles form,
there may be a leak.
Cubic Feet of Natural Gas
60'
70'
80'
66
61
56
138
127
118
259
239
222
532
490
456
798
734
683
1536
1413
1315
kBTU of Propane
60'
70'
80'
103
96
89
217
196
185
409
378
346
834
771
724
1275
1181
1086
2394
2205
2047
7
Fire or explosion may result if the
: Conversion of this unit from natural
90'
100'
125'
53
50
44
111
104
93
208
197
174
428
404
358
641
605
536
1234
1165
1033
90'
100'
125'
83
78
69
173
162
146
322
307
275
677
630
567
1023
976
866
1921
1811
1606
150'
200'
40
34
84
72
158
135
324
278
486
416
936
801
150'
200'
63
55
132
112
252
213
511
440
787
675
1496
1260
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