Installation and Operation Manual
58 Rinnai Tankless Water Heater Installation and Operation Manual
4.10.2 Gas Pipe Sizing Reference Tables
Worksheet
Rinnai Model Gas Input:
A
C
3
(CFH)
C
(CFH)
(CFH)
3
/hr
Natural Gas
Information in table
obtained from NFPA 54,
ANSI Z223.1 - 2021.
1/2 3/4 1 1 1/4
10 (3) 172 360 678
20 (6) 118 247 466 957
30 (9) 95 199 374 768
40 (12) 81 170 320 657
50 (15) 72 151 284 583
60 (18) 65 137 257 528
70 (21) 60 126 237 486
80 (24) 56 117 220 452
90 (27) 52 110 207 424
100 (30) 50 104 195 400
Less than 2 psi
Rinnai Model Gas Input:
Answer:
A
199,000
65,000
C
1,000
3
(CFH)
C
(CFH)
199,000+65,000
1,000
(CFH)
264
3
/hr