Gas Supply Piping
Check the rating plate to make sure that the unit was built for the type of gas available in the area. The gas supply piping should be sized according to the Applicable Plumbing Code for a maximum draw of 190,000 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 “Tee” 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 than one gas drawing appliances on the line, size according to the maximum amount of BTU demand. The gas supply pressures must be within the ranges of the following chart:
Natural Gas | Min. 5” WC |
Supply Pressure | Max. 10.5” WC |
Propane Gas | Min. 11” WC |
Supply Pressure | Max. 14” WC |
Insufficient gas supply pressure can cause the Flash Water Heater to lose efficiency or not work at all.
WARNING: Fire or explosion may result if the maximum supply pressures are exceeded. The manifold gas pressure should be at maximum 2.6” WC for natural gas, and 3.4” WC for propane.
Always use approved connectors to connect the unit to the gas line. Always purge the gas line of any debris before connecting to the water heater.
WARNING: Conversion of this unit from natural gas to propane or propane to natural gas cannot be done in the field. Contact your local retailer or distributor to get the correct unit for your gas type. Always install a manual shutoff valve on the gas supply line in case of an emergency, or if service or maintenance is necessary.
This appliance and its individual
When all of the connections have been made, check the gas line for leaks. Apply soapy water to all gas fittings and connections, if bubbles form, there may be a leak.
Natural Gas Supply Piping
Based on 0.60 specific gravity for natural gas at .5” WC pressure drop
DOE standard is 1100 BTU per cubic ft. of natural gas
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Length | 10’ | 20’ | 30’ | 40’ | 50’ | 60’ | 70’ | 80’ | 90’ | 100’ | 125’ | 150’ | 200’ |
½” | 174 | 119 | 96 | 82 | 73 | 66 | 61 | 56 | 53 | 50 | 44 | 40 | 34 |
¾” | 363 | 249 | 200 | 171 | 152 | 138 | 127 | 118 | 111 | 104 | 93 | 84 | 72 |
1” | 684 | 470 | 377 | 323 | 286 | 259 | 239 | 222 | 208 | 197 | 174 | 158 | 135 |
1 ¼” | 1404 | 965 | 775 | 663 | 588 | 532 | 490 | 456 | 428 | 404 | 358 | 324 | 278 |
1 ½” | 2103 | 1445 | 1161 | 993 | 880 | 798 | 734 | 683 | 641 | 605 | 536 | 486 | 416 |
2” | 4050 | 2784 | 2235 | 1913 | 1696 | 1536 | 1413 | 1315 | 1234 | 1165 | 1033 | 936 | 801 |
Propane Supply Piping
Based on 11” WC supply pressure
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Length | 10’ | 20’ | 30’ | 40’ | 50’ | 60’ | 70’ | 80’ | 90’ | 100’ | 125’ | 150’ | 200’ |
½” | 275 | 189 | 152 | 129 | 114 | 103 | 96 | 89 | 83 | 78 | 69 | 63 | 55 |
¾” | 567 | 393 | 315 | 267 | 237 | 217 | 196 | 185 | 173 | 162 | 146 | 132 | 112 |
1” | 1071 | 732 | 590 | 504 | 448 | 409 | 378 | 346 | 322 | 307 | 275 | 252 | 213 |
1 ¼” | 2205 | 1496 | 1212 | 1039 | 913 | 834 | 771 | 724 | 677 | 630 | 567 | 511 | 440 |
1 ½” | 3307 | 2299 | 1858 | 1559 | 1417 | 1275 | 1181 | 1086 | 1023 | 976 | 866 | 787 | 675 |
2” | 6221 | 4331 | 3465 | 2992 | 2646 | 2394 | 2205 | 2047 | 1921 | 1811 | 1606 | 1496 | 1260 |
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