17
GAS SUPPLY AND PIPING
GENERAL INFORMATION
DANGER
THIS WATER HEATER IS EQUIPPED FOR
ONE TYPE OF GAS ONLY. DO NOT USE THIS
WATER HEATER WITH ANY GAS OTHER
THAN THE ONE LISTED ON THE DATA
PLATE LOCATED ON THE WATER HEATER
JACKET. FAILURE TO USE THE CORRECT
GAS CAN RESULT IN PROPERTY DAMAGE,
BODILY INJURY, OR DEATH.
GAS PIPING
This water heater must only be connected
to gas supplied by a commercial supplier.
Install the gas piping according to all local and
state codes or with the ”National Fuel Gas
Code”, ANSI Z223.1 (NFPA 54) - Latest
Edition.
Do not use copper or brass piping and fittings.
Do not use flexible connectors. Use only rigid
pipe.
Table 2 and or Table 3 are provided as a
sizing reference for commonly used gas pipe
materials. Consult the “National Fuel and Gas
Code” for the recommended gas pipe size of
other materials.
DANGER
THE GAS LINE MUST BE OF ADEQUATE
SIZE SO AS TO PREVENT UNDUE
PRESSURE DROP AND NEVER SMALLER
THAN THE PIPE SIZE TO THE GAS VALVE
ON THE WATER HEATER. FAILURE TO
PROPERLY SIZE THE GAS LINE CAN
CAUSE A FIRE OR EXPLOSION RE-
SULTING IN PROPERTY DAMAGE, BODILY
INJURY OR DEATH.
TABLE 3
LP GAS PIPE CAPACITY TABLE
Maximum capacity of pipe in thousands of BTU per hour of undiluted liquefied petroleum gases (at 11 inches water column inlet pressure). Based on a Pressure
Drop of 0.5 Inch Water Column.
Nominal iron
pipe size, in.
Len
gth of Pipe, Feet
10 20 30 40 50 60 70 80 90 100 125 150
1/2 275 189 152 129 114 103 96 89 83 78 69 63
3/4 567 393 315 267 237 217 196 185 173 162 146 132
1 1071 732 590 504 448 409 378 346 322 307 275 252
1-1/4 2205 1496 1212 1039 913 834 771 724 677 630 567 511
Example: Input BTU requirement of the water heater, 100,000 BTUH
Total pipe length, 80 feet = 3/4" IPS required.
TABLE 2
NATURAL GAS PIPE CAPACITY TABLE (CU. FT./HR)
Capacity of gas pipe of different diameters and lengths in cu. ft. per hr. with pressure drop of 0.3 in.
and specific gravity of 0.60 (natural gas).
Nominal
Iron Pipe
Size, Inches
Length of Pipe, Feet
10 20 30 40 50 60 70 80 90 100 125 150 75 200
1/2 132 92 73 63 56 50 46 43 40 38 34 31 28 26
3/4 278 190 152 130 115 105 96 90 84 79 72 64 59 55
1 520 350 285 245 215 195 180 170 160 150 130 120 110 100
1-1/4 1050 730 590 500 440 400 370 350 320 305 275 250 225 210
1-1/2 1600 1100 890 760 670 610 560 530 490 460 410 380 350 320
After the length of pipe has been determined, select the pipe size which will provide the minimum cubit feet per hour required for the gas input rating of the water
heater. By formula:
Cu. Ft. Per Hr. Required =
Gas Input of Water Heater (BTU/HR)
Heating Value of Gas (BTU/FT³)
The gas input of the water heater is marked on the water heater data plate. The heating value of the gas (BTU/FT3) may be determined by consulting the local
natural gas utility.
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