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PQ Curve
NFB-175/200
H[ft]
Q [GPM]
H [ft]
Maximum and Minimum Flow Rates through the Boiler
Model
Minimum Pipe Diameter
NFB-175
NFB-200
Temperature Rise Conditions
20°F ΔT @ 100% water
Model
Flow Rate (GPM)
NFB-175
NFB-200
22
Installing the System Piping
16
14
12
10
8
6
4
2
0
0
2
4
6
0
2.6
5.3
0
0.3
0.7
1
/
"
1
4
1
/
"
1
4
Head (Ft)
16
4.2
18
5.3
8
10
12
14
16
Q[GPM]
7.9
10.6
13.2
1.1
2
3
Maximum Flow (GPM)
23.1
26.4
25°F ΔT @ 100% water
Flow Rate (GPM)
13
15
18
20
22
24
26
15.9
18.5
21.1
4.3
5.6
7.4
Minimum Flow (GPM)
35°F ΔT @ 100% water
Head (Ft)
Flow Rate (GPM)
2.9
9
3.9
11
28
23.8
26.4
9.2
11.5
7.0
8.0
Head (Ft)
1.4
2.1
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