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PQ Curve
NFB-175H/200H
16
14
12
10
8
H[ft]
6
4
2
0
0
2
Q [GPM]
0
H [ft]
0
Maximum and Minimum Flow Rates through the Boiler
Model
Minimum Pipe Diameter
NFB-175H
NFB-200H
Temperature Rise Conditions
20°F ΔT @ 100% water
Model
Flow Rate
(GPM)
NFB-175H
16
NFB-200H
18
4
6
8
1 0
1 2
2.6
5.3
7.9
0.3
0.7
1.1
Maximum Flow (GPM)
1
/
"
1
4
1
/
"
1
4
25°F ΔT @ 100% water
Head
Flow Rate
(Ft)
(GPM)
4.2
5.3
1 4
1 6
1 8
Q[GPM]
10.6
13.2
15.9
2
3
4.3
23.1
26.4
Head
(Ft)
13
2.9
15
3.9
2 0
2 2
2 4
2 6
2 8
18.5
21.1
23.8
5.6
7.4
9.2
Minimum Flow (GPM)
7.0
8.0
35°F ΔT @ 100% water
Flow Rate
Head
(GPM)
(Ft)
9
1.4
11
2.1
Installing the System Piping
26.4
11.5
23
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