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INSTALLATION
Maximum delivery Capacity in Cubic Feet of Gas per Hour (based on IPS Pipe carrying Natural Gas with 0.60 Specifi c Gravity with
a Pressure Drop of 0.5" W.C.).
Based on Energy Content of 1,000 BTU/
3
/h for the THR-160.
The following tables are from ANSI Z223.1/NFPA 54.
Table 11: Natural Gas Table
Pipe Size
10'
20'
Diameter
(3.0 m)
(6.1 m)
1/2"
172
118
3/4"
360
247
1"
678
466
1-1/4"
1,390
957
1-1/2"
2,090
1,430
2"
4,020
2,760
Maximum Capacity of Propane (LP) Based on 11" W.C. supply pressure at a 0.5" W.C. pressure drop.
Table 12: Propane Gas Table
Pipe Size
10'
20'
Diameter
(3.0 m)
(6.1 m)
268
184
1/2"
3/4"
567
393
1"
1,071
732
1-1/4"
2,205
1,496
1-1/2"
3,307
2,299
2"
6,221
4,331
Gas sizing example
(Natural Gas)
Based on Energy Content of 1,000 BTU/Cubic :
Divide each appliance's BTU/h requirement by 1,000 BTU/
Take into account the distance the appliance is from the gas meter, look in the above gas chart to properly size the line.
For sec ons of the gas line supplying gas to more than one appliance (Ex: Point A to Point B), add up the cubic
requirements of the appliances that are being supplied by that sec on, and size to the farthest appliance.
For Example: The sec on from A to B supplies gas to the furnace, range and dryer. Adding up the BTU/h requirements and
dividing by 1,000 yields a cubic
which is 50
away from the meter. Looking at the above chart, and under the column of 50 , Sec on A to B needs to be 1" in
order to supply 220 cubic .
32 • Residen al Gas Tankless Water Heater Use and Care Guide
Natural Gas Supply Piping
3
: The water heater requires 199
30'
40'
50'
(9.1 m)
(12.2 m)
(15.2 m)
95
81
72
199
170
151
374
320
284
768
657
583
1,150
985
873
2,220
1,900
1,680
Propane (LP) supply piping
30'
40'
50'
(9.1 m)
(12.2 m)
(15.2 m)
148
126
112
315
267
237
590
504
448
1,212
1,039
913
1,858
1,559
1,417
3,465
2,992
2,646
Water heater
199,000 BTU/h
5' (1.5 m)Length
1-1/4" Pipe size
5' (1.5 m) Length
1-1/4" Pipe size
Gas meter
per hour requirement of 220 cubic
3
/h for the THR-199, 180
Length
60'
70'
80'
(18.3 m)
(21.3 m)
(24.4 m)
65
60
56
137
126
117
257
237
220
528
486
452
791
728
677
1,520
1,400
1,300
Length
60'
70'
80'
(18.3 m)
(21.3 m)
(24.4 m)
101
93
87
217
196
185
409
378
346
834
771
724
1,275
1,181
1,086
2,394
2,205
2,047
10' (3 m)Length
1/2" Pipe size
15' (4.6 m)Length
B
1" Pipe size
A
10' (3 m )Length
1" Pipe size
10' (3 m)Length
3/4" Pipe size
Furnace
120,000 BTU/h
3
to get the appliance's
of gas per hour. The farthest appliance is the range,
3
/h for the THR-180, 160
(Unit: Cubic feet per hour)
90'
100'
125'
(27.4 m)
(30.5 m)
(38.1 m)
52
50
44
110
104
92
207
195
173
424
400
355
635
600
532
1,220
1,160
1,020
(Unit: kBTU per hour)
90'
100'
125'
(27.4 m)
(30.5 m)
(38.1 m)
82
77
68
173
162
146
322
307
275
677
630
567
1,023
976
866
1,921
1,811
1,606
Dryer
35,000 BTU/h
10' (3 m)Length
1/2" Pipe size
15' (4.6 m)Length
1/2" Pipe size
C
Range
65,000 BTU/h
3
/h requirement.
150'
200'
(45.7 m)
(61.0 m)
40
34
83
71
157
134
322
275
482
412
928
794
150'
200'
(45.7 m)
(61.0 m)
62
53
132
112
252
213
511
440
787
675
1,496
1,260
per hour
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