Loading ...
Loading ...
Loading ...
Rinnai Tankless Water Heater Installation and Operation Manual 58
4.10.2 Gas Pipe Sizing Reference Tables
all gas products are in use.
Table 22: Gas Pipe Sizing Calculation
Worksheet
Rinnai Model Gas Input:
Additional Appliance Total Gas Input:
Cubic Feet Per Hour (CFH):
A Btu/hr
B Btu/hr
C
3
(CFH)
A + B
C
(CFH)
(CFH)
3
/hr
Natural Gas
Information in table
obtained from NFPA 54,
ANSI Z223.1 - 2015.
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
Schedule 40 Metallic Pipe
Inlet Pressure: Less than 2 psi
0.60
Rinnai Model Gas Input:
Additional Appliance Total Gas Input:
Cubic Feet Per Hour (CFH):
Answer:
A
199,000
Btu/hr
B
65,000
Btu/hr
C
1,000
3
(CFH)
A + B
C
(CFH)
199,000+65,000
1,000
(CFH)
264
3
/hr
Loading ...
Loading ...
Loading ...