GAS PIPING, CONNECTIONS and Gas Regulator
Before connecting the gas supply, check the rating plate on the right side of the front cover to be sure that the heater is rated for the same gas to which it will be connected.
In the United States: The installation must conform with local codes or, in the absence of local codes, the National Fuel Gas Code ANSI Z223.1/NFPA 54.
In Canada: The Installation should conform with CGA B149 INSTALLATION CODES and /or local installation codes.
GAS LINE SIZING
The gas supply piping should be sized according to the Applicable Plumbing Code for a maximum draw of 117,000 BTUH. First determine the effective length of the gas supply line by measuring the actual length of piping, and then adding 5 ft. for every elbow or “T” to the actual length. Use the charts below to determine the pipe diameter necessary to accommodate the BTU demand of the unit. If there are more gas drawing appliances on the line, size according to the maximum amount of BTU demand.
FOR NATURAL GAS
Maximum Capacity of pipe in Cubic Feet of Gas per Hour for Gas Pressure of 0.5 Psig or less and a Pressure drop of 0.3 in Water Column.
(Based on a 0.60 Specific Gravity Gas) Btu numbers given in thousands.
Follow boxed numbers for piping just oneAquastar 125HX (example: 3/4” B.I. Natural Gas pipe for 30 ft. will handle 152,000 btu’s). For multiple appliances combine the total btu input load and then refer to applicable chart below.
Nominal |
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Iron |
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| Length of Black Iron Pipe, Feet |
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Pipe | Internal |
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Size, | Diameter |
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inches | inches | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 | 125 | 150 | 175 200 |
| 1/4 | 0.364 | 32 | 22 | 18 | 15 |
| 3/8 | 0.493 | 72 | 49 | 40 | 34 |
| 1/2 | 0.622 | 132 | 92 | 73 | 63 |
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| 3/4 | 0.824 | 278 | 190 | 152 | 130 |
| 1 | 1.049 | 520 | 350 | 285 | 245 |
1 | 1/4 | 1.380 | 1050 | 730 | 590 | 500 |
1 | 1/2 | 1.610 | 1600 | 1100 | 890 | 760 |
| 2 | 2.067 | 3050 | 2100 | 1650 | 1450 |
2 | 1/2 | 2.469 | 4800 | 3300 | 2700 | 2300 |
| 3 | 3.068 | 8500 | 5900 | 4700 | 4100 |
| 4 | 4.026 | 17,500 | 12,000 | 9,700 | 8,300 |
14 | 12 | 11 | 11 | 10 | 9 | 8 | 8 | 7 | 6 |
30 | 27 | 25 | 23 | 22 | 21 | 18 | 17 | 15 | 14 |
56 | 50 | 46 | 43 | 40 | 38 | 34 | 31 | 28 | 26 |
115 | 105 | 96 | 90 | 84 | 79 | 72 | 64 | 59 | 55 |
215 | 195 | 180 | 170 | 160 | 150 | 130 | 120 | 110 | 100 |
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440 | 400 | 370 | 350 | 320 | 305 | 275 | 250 | 225 | 210 |
670 | 610 | 560 | 530 | 490 | 460 | 410 | 380 | 350 | 320 |
1270 | 1150 | 1050 | 990 | 930 | 870 | 780 | 710 | 650 | 610 |
2000 | 1850 | 1700 | 1600 | 1500 | 1400 | 1250 | 1130 | 1050 | 980 |
3600 | 3250 | 3000 | 2800 | 2600 | 2500 | 2200 | 2000 | 1850 | 1700 |
7,400 | 6,80 | 6,200 | 5,800 | 5,400 | 5,100 | 4,500 | 4,100 | 3,800 | 3500 |
FOR LP GAS
Maximum Capacity of Pipe in Thousands of BTU per Hour of Undiluted Petroleum Gases (at 11 inches Water Column Inlet Pressure) (Based on a Pressure Drop of 0.5 Inch Water Column).
Maximum Capacity of
Tubing in Thousands of BTU per Hour of Undiluted Liquified Petroleum Gases (at 11 inches Water Column Inlet Pressure)
(Based on a Pressure Drop of 0.5 Inch Water Column)
Nominal |
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Iron Pipe |
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Size, |
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| Length of Pipe, Feet |
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Inches | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 | 125 | 150 |
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| 1/2 |
| 275 | 189 | 152 | 129 | 114 | 103 | 96 | 89 | 83 | 78 | 69 | 63 |
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| 3/4 | 567 | 693 | 315 | 267 | 237 | 217 | 196 | 185 | 173 | 162 | 146 | 132 |
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1 | 107 | 732 | 590 | 504 | 448 | 409 | 378 | 346 | 322 | 307 | 275 | 252 |
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1 1/4 | 220 | 149 | 121 | 103 | 913 | 834 | 771 | 724 | 677 | 630 | 567 | 511 |
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1 1/2 | 330 | 229 | 185 | 155 | 141 | 127 | 118 | 108 | 102 | 976 | 866 | 787 |
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2 | 622 | 433 | 346 | 299 | 264 | 239 | 220 | 204 | 192 | 1811 | 1606 | 1496 |
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| Copper |
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Outside |
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Diameter, |
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Inch | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 |
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3/8 | 39 | 26 | 21 | 19 | _ | _ | _ | _ | _ | _ |
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1/2 | 92 | 62 | 50 | 41 | 37 | 35 | 31 | 29 | 27 | 26 |
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| 5/8 |
| 199 | 131 | 107 | 90 | 79 | 72 | 67 | 62 | 59 | 55 |
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| 3/4 | 329 | 216 |
| 181 | 145 | 131 | 121 | 112 | 104 | 95 | 90 |
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| 7/8 | 501 | 346 | 277 | 233 | 198 | 187 | 164 | 155 | 146 | 138 |
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* Source National Fuel Gas Code NFPA 54, ANSI Z223.1.
8 | 6 720 606 804 (02.10) |