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VZ-VZH-VZT-IOM (08-24) 1047121-A
Table 15. Gas Supply Line Sizes
Pipe
Length
(Feet)
Natural Gas Propane
Pipe Diameter (Inches)
1/2 3/4 1 1-1/4 1-1/2 2 1/2 3/4 1 1-1/4 1-1/2 1-1/2
Cubic Feet per Hour
20 92 190 350 730 1100 2100 56 116 214 445 671 1281
30 73 152 285 590 890 1650 45 93 174 360 543 1007
40 63 130 245 500 760 1450 38 79 149 305 464 885
50 56 115 215 440 670 1270 34 70 131 268 409 775
60 50 105 195 400 610 1105 31 64 119 244 372 674
70 46 96 180 370 560 1050 28 59 110 226 342 641
80 43 90 170 350 530 990 26 55 104 214 323 604
90 40 84 160 320 490 930 24 51 98 195 299 567
100 38 79 150 305 460 870 23 48 92 186 281 531
125 34 72 130 275 410 780 21 44 79 168 250 476
150 31 64 120 250 380 710 19 39 73 153 232 433
175 28 59 110 225 350 650 17 36 67 137 214 397
200 26 55 100 210 320 610 16 34 61 128 195 372
INSTALLATION—CONTINUED
Piping Connections—Continued
Gas Supply Piping—Continued
• All piping must be in accordance with requirements outlined in the National Fuel Gas Code (ANSI/Z223.1, latest
edition) or the Natural Gas and Propane Installation Code (CSA B149.1, latest edition).
• Gas supply piping installation shall conform with good practice and with local codes.
• Support gas piping with pipe hangers, metal strapping, or other suitable material. Do not rely on the heater to
support the gas pipe.
• Variables for sizing gas supply lines are listed in Table 15. When sizing supply lines, consider the possibility of
future expansion and increased requirements. Refer to the National Fuel Gas Code for additional information on
line sizing.
Supply Piping Connections
⚠ DANGER ⚠
• FIRE OR EXPLOSION HAZARD: Expansion of the radiant pipe occurs with each firing cycle
causing the burner to move with respect to the gas line. This can result in a gas leak.
• The heater expands and contracts in use, so it is essential to provide flexibility in the final gas
connection. In the US, use the stainless steel flexible gas connector provided with the unit that
complies with the Standard for Connectors for Gas Appliances (ANSI Z21.24/CSA 6.10, latest
revision). In Canada, use the optional Type 1 rubber flexible gas connector that complies with
the Standard for Elastomeric Composite Hose and Hose Couplings for Conducting Propane and
Natural Gas (CAN/CGA 8.1, latest revision).
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