25
Gas Supply Piping
GAS SUPPLY PIPING
Venting Equipment Codes
This water heater must be vented in accordance with
"Venting of Equipment" section of the latest edition of
the National Fuel Gas Code, ANSI Z223.1 and all appli-
cable local building codes.
Always use approved connectors to connect the unit
to the gas line. Always purge the gas line of any
debris before connecting to the heater gas inlet.
Distance from gas meter
Pipe size(inches)
0 ft. to 20 ft.
3/4 inch
20 ft. to 60 ft.
1 inch
60 ft. to 100 ft.
1-1/4 inch
Recommended Gas Pipe Size
( Diameter, for Natural Gas)
NOTE:
This unit needs a manual gas control valve
(shut-off valve) that must be connected to the unit
before the gas line.
Check
the gas inlet pressure and the type of gas
matching the rating plate located on your water
heater. Also check to make sure your gas meter is
capable of supplying sufficient BTU load to all
appliances. Insufficient gas pressure and volume will
cause your water heater to be deficient in performance
and may not work properly.
When measuring the inlet supply pressure, the wa-
ter heater and all other gas appliances sharing the
gas supply line must be firing at maximum capacity.
Maximum gas pressures must not exceed listed
value.
Low gas pressure could be caused by an undersized
gas pipe, this will cause the water heater's perfor-
mance to diminish and it would not be able to reach
maximum performance.
Gas Piping System Codes
:
Size gas piping system correctly following ANSI Z223.
1/NFPA 54, or by local code.
Check for Gas Leaks
When connections are completed, check for gas
leaks by applying soapy water to all gas fittings and
connections. Presence of soap bubbles foaming is a
sign of gas leaks.
This appliance and its individual shut-off valve must
be isolated from the gas supply piping system by
unplugging the unit and turning off the main gas valve
during any pressure testing of the gas supply piping
system at test pressures equal to or less than 1/2
PSI.
NATURAL GAS SUPPLY PIPING
P i p e
s iz e
L e n g t h
1 0
’
2 0
’
3 0
’
4 0
’
5 0
’
6 0
’
7 0
’
8 0
’
9 0
’
1 0 0
’
1 2 5
’
1 5 0
’
2 0 0
’
1 / 2
”
1 7 4
1 1 9
9 6
8 2
7 3
6 6
6 1
5 6
5 3
5 0
4 4
4 0
3 4
3 / 4
”
3 6 3
2 4 9
2 0 0
1 7 1
1 5 2
1 3 8
1 2 7
1 1 8
1 1 1
1 0 4
9 3
8 4
7 2
1
”
6 8 4
4 7 0
3 7 7
3 2 3
2 8 6
2 5 9
2 3 9
2 2 2
2 0 8
1 9 7
1 7 4
1 5 8
1 3 5
1 1 / 4
”
1 4 0 4
9 6 5
7 7 5
6 6 3
5 8 8
5 3 2
4 9 0
4 5 6
4 2 8
4 0 4
3 5 8
3 2 4
2 7 8
1 1 / 2
”
2 1 0 3
1 4 4 5
1 1 6 1
9 9 3
8 8 0
7 9 8
7 3 4
6 8 3
6 4 1
6 0 5
5 3 6
4 8 6
4 1 6
2
”
4 0 5 0
2 7 8 4
2 2 3 5
1 9 1 3
1 6 9 6
1 5 3 6
1 4 1 3
1 3 1 5
1 2 3 4
1 1 6 5
1 0 3 3
9 3 6
8 0 1
C u b ic F e e t o f N a t u ra l G a s
Based on 0.60 specific gravity for natural gas at 0.5 "W.C. pressure drop DOE standard is 1100 BTU per cubic ft. of
natural gas.
P i p e
s iz e
L e n g t h
1 0
’
2 0
’
3 0
’
4 0
’
5 0
’
6 0
’
7 0
’
8 0
’
9 0
’
1 0 0
’
1 2 5
’
1 5 0
’
2 0 0
’
1 / 2
”
2 7 6
1 9 0
1 5 3
1 3 0
1 1 5
1 0 4
9 7
9 0
8 4
7 9
7 0
6 4
5 6
3 / 4
”
5 6 8
3 9 4
3 1 6
2 6 8
2 3 8
2 1 8
1 9 7
1 8 6
1 7 4
1 6 3
1 4 7
1 3 3
1 1 2
1
”
1 0 7 2
7 3 3
5 9 1
5 0 5
4 4 9
4 1 0
3 7 9
3 4 7
3 2 3
3 0 8
2 7 6
2 5 3
2 1 3
1 1 / 4
”
2 2 0 6
1 4 9 7
1 2 1 3
1 0 4 0
9 1 4
8 3 5
7 7 2
7 2 5
6 7 8
6 3 1
5 6 7
5 1 1
4 4 0
1 1 / 2
”
3 3 0 8
2 3 0 0
1 8 5 9
1 5 6 0
1 4 1 8
1 2 7 6
1 1 8 2
1 0 8 7
1 0 2 4
9 7 7
8 6 7
7 8 8
6 7 6
2
”
6 2 2 2
4 3 3 2
3 4 6 6
2 9 9 3
2 6 4 7
2 3 9 5
2 2 0 6
2 0 4 8
1 9 2 2
1 8 1 2
1 6 0 7
1 4 9 6
1 2 6 0
K B T U o f P ro p a n e G a s
PROPANE GAS SUPPLY PIPING
Based on 11 "W.C. supply pressure.
