32
WHL-032 REV. 6.2.16
Maximum Liquid Propane Delivery Capacity
– Length of Black Iron Pipe (Sch. 40 Metallic) in Feet
Pipe Size
Cubic Feet per Hour (0.60 Specific Gravity, 0.5 WC Pressure Drop)
10
20
30
40
50
60
80
100
150
200
¾”
608
418
336
287
255
231
212
197
175
140
1”
1150
787
632
541
480
434
400
372
330
265
1 ¼”
2350
1620
1300
1110
985
892
821
763
677
543
1 ½”
3520
2420
1940
1660
1480
1340
1230
1140
1010
814
2”
6790
4660
3750
3210
2840
2570
2370
2200
1950
1570
Table 14
– Liquid Propane Delivery Capacity – Black Iron Pipe – Refer to ANSI Z223.1 – National Fuel Gas Code, Latest Edition
C. GAS CONNECTION REQUIREMENTS
1. The gas connection fitting on the water heater is ¾” female NPT.
NOTE:
The pipe size must not be less than ¾”.
2. The supply line must be sized for the maximum output of the water heater being installed. If there are additional gas appliances from
the main supply line, measure the size of the supply line according to the COMBINED total maximum BTUH draw for the appliances as
if they were operating at the same time.
3. Measure the length of the gas supply line from the gas meter to the water heater. Water heater must be installed downstream of the
gas meter to ensure adequate gas supply. Use the tables in this manual or refer to the gas line manufacturer’s sizing information to
determine the correct supply pipe size.
4. A manual gas shut-off valve should be installed in the gas supply line close to the water heater. See Figure 18 for detail.
5. To facilitate any future maintenance, it is also recommended that an approved gas union fitting be installed in the supply line between
the shut-off valve
and the ¾” female NPT connection on the water heater.
Figure 18
– Gas Line with Shut-Off Valve Detail
Figure 19
– Natural Gas Piping Installation – NOTE: Capacity to be Not Less than Total Capacity of Connected Boilers
Figure 20
– LP Gas Piping Installation – NOTE: Capacity to be Not Less than Total Capacity of Connected Boilers
