Recommend Gas pipe size for
MOBIUS Water Heater
Distance from Gas Meter Pipe Size (inches)
0' - 20' 3/4"
20' - 80' 1"
80' - 300 1-1/4"
NOTE: These Tables are for Natural Gas (0.60
Specific Gravity) and based on Pressure Drop
of 0.5 Inch water columns. This table is Gas
piping supply straight to the water heater
without any tab to other gas appliance.
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
Pipe
Size
Cubic Feet of Natural Gas
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
Pipe
Size
kBTU of Propane
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
Water Connections
An approved manual water control valve (water
shutoff valve) must be placed on the cold water
supply line. All soldering materials and piping
materials must be suitable with potable water.
If the water heater is installed in a closed water
system, such as one having a backflow
preventer in the cold water supply line, must be
provided to control thermal expansion. Contact
the water supplier or local plumbing inspector
on how to control this situation.
After installation of water heater is complete,
purge the water line to remove all the debris
and air from the line. Failure to or not doing so
may cause damage to the heater. There is a
wire mesh filter to trap debris from entering
your heater. This will need to be cleaned
periodically for long life expectance.
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