Installation Sheet

52 Rinnai Tankless Water Heater Installaon and Operaon Manual
Propane (Undiluted)
Pressure Drop 0.5 in. w.c.
Nominal Inside Pipe Size (in.)
1/2 3/4 1 1 1/4
Length in  (meters) Capacity in Thousands of BTU per Hour
10 (3) 291 608 1,150 2,350
20 (6) 200 418 787 1,620
30 (9) 160 336 632 1,300
40 (12) 137 287 541 1,110
50 (15) 122 255 480 985
60 (18) 110 231 434 892
80 (24) 101 212 400 821
100 (30) 94 197 372 763
Pressure Drop 3.0 in. w.c.
Schedule 40 Metallic Pipe
Inlet Pressure: Less than 2 psi
Specic Gravity: 0.6
Nominal Pipe Size (in.)
1/2 3/4 1 1 1/4
Length in  (meters)
Capacity in Cubic Feet of Gas per Hour
10 (3)
454 949 1,790 3,670
20 (6)
312 652 1,230 2,520
30 (9)
250 524 986 2,030
40 (12)
214 448 844 1,730
50 (15)
190 397 748 1,540
60 (18)
172 360 678 1,390
70 (21)
158 331 624 1,280
80 (24)
147 308 580 1,190
90 (27)
138 289 544 1,120
100 (30)
131 273 514 1,060
Informaon in table obtained from
NFPA 54, ANSI Z223.1 - 2015.
Informaon in table obtained from
NFPA 54, ANSI Z223.1 - 2015.
Intended use: Inial supply pressure
of 8.0 in. w.c. or greater.
Natural Gas
Schedule 40 Metallic Pipe
Inlet Pressure: 11 in. w.c.
Specic Gravity: 1.50
EXAMPLE
Rinnai Model Gas Input:
Addional Appliance total Gas Input:
Heang Value of Gas:
Cubic Feet Per Hour (CFH):
ANSWER:
B
65,000
BTU/HR
C
1,000
BTU/FT
3
A
199,000
BTU/HR
199,000+65,000
(CFH) =
1000
264
FT
3
/HR
CFH =
For this example, the pipe diameter
must be at least 1/2 in. nominal
pipe size and 20  (6 m) in length.
A + B
(CFH) =
C
EXAMPLE
Rinnai Model Gas Input:
Addional Appliance Total Gas Input:
Total Gas Input:
ANSWER:
B
65,000
BTU/HR
A
199,000
BTU/HR
= BTU/HR
Total Gas
Input
264,000
For this example, the pipe diameter
must be at least 1/2 in. nominal
pipe size and 10  (3 m) in length.
Total
Gas
Input
= A + B
Total
Gas
Input
=
199,000+65,000