Navien NCB-150E Service Manual page 26

Maximum Liquefied Propane Delivery Capacity
in Thousands of BTU/H (0.5" WC Pressure Drop)
Length (including fittings)
Pipe Size
10' 20'
(3m) (6m)
1/2" 291 200
3/4" 608 418
1" 1,150 787
1 1/4" 2,350 1,620
1 1/2" 3,520 2,420
2" 6,790 4,660
NOTE
For installations using CSST (flexible) gas piping, please refer to the sizing charts provided by the manufacturer.
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The use of single-stage regulators are recommended. Dual-stage regulators could cause operational issues with the boiler.
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30' 40' 50' 60'
(9m) (12m) (15m) (18m)
160 137 122 110
336 287 255 231
632 541 480 434
1,300 1,110 985 892
1,940 1,660 1,480 1,340
3,750 3,210 2,840 2,570
80' 100' 125' 150'
(24m) (30m) (38m) (45m)
101 94 89 84
212 197 185 175
400 372 349 330
821 763 716 677
1,230 1,140 1,070 1,010
2,370 2,200 2,070 1,950
175' 200' 250'
(53m) (60m) (76m)
74 67 62
155 140 129
292 265 243
600 543 500
899 814 749
1,730 1,570 1,440
System Details 25