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Bosch Greentherm 9800 SE 160/199 Manual page 29

Indoor residential and comme rcial tankless water heaters
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4.8.1 Gas Line Sizing Tables for NATURAL GAS
For your convenience see below for an excerpt from gas line sizing tables for a single NG appliance. For details see the current NFPA
54.
Required input for 160000 / 199000 BTU/hr for the Greentherm 9800 SE / SEC. The gas supply system must be sized for the
combined total maximum BTU/hr load requirements of all gas appliances running simultaneously.
The tables below show the maximum capacity of the gas supply pipe in cubic feet per hour. Please contact your local gas supplier
for the energy content of the gas to determine the BTU/hr capacity. Use 1,000 BTU/cubic foot for rough estimations.
Maximum pipe capacity in cubic feet of Natural Gas per hour for gas pressures of <2.0 psig (55" WC or 138 mbar) and a pressure
drop of 3.0" W.C. (7.5 mbar) based on 0.60 specific gravity gas).
Nominal
Internal
Iron Pipe
Diameter
Size, inches
inches
½
0.622
¾
0.824
1
1.049
Table 11
Maximum pipe capacity in cubic feet of Natural Gas per hour for gas pressures of <2.0 psig (55" WC or 138 mbar) and a pressure
drop of 3.0" W.C. (7.5 mbar) based on 0.60 specific gravity gas).
EHD*
10
30
828
31
958
37
1,530
Table 12
* EHD = Equivalent Hydraulic Diameter. The greater the value of
EHD, the greater the gas capacity of the tubing.
Greentherm 9800 SE 160/199 | SEC 199
Initial Supply Pressure of 8.0" w.c. or Greater
Length of Black Iron Pipe (Schedule 40 Metallic Pipe), Feet
10
20
30
454
312
250
949
652
524
1787
1228
986
Initial Supply Pressure of 8.0" w.c. or Greater
Length of Corrugated Stainless Steel Tubing (CSST), Feet
20
30
40
580
471
407
672
546
471
1,090
895
778
40
50
60
214
190
172
448
397
360
844
748
678
50
60
70
363
330
305
421
383
355
698
639
593
Installation instructions | 29
70
80
90
158
147
138
331
308
289
624
580
544
80
90
285
268
331
311
555
524
6 720 816 815 (2016/10)
100
131
273
514
100
251
295
498

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