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The chart below represents the pressure drop (Ft of Head) versus the water flow rate (GPM) for the P-K
STORM ST-5000 through ST-8000. This information is useful to help size an appropriate circulation
pump. Keep in mind this pressure drop represents the boiler only, additional consideration is needed
for any connecting piping, valves, strainers, couplings, flanges, etc.
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
0
50
100
ST-5000 through ST-8000 Boilers: Minimum & Maximum Flow Rates
Flow
Boiler
Condition
Operation
Maximum Flow High Fire
Minimum Flow
High Fire
Minimum Flow
Ignition
Minimum Flow
Low Fire
Revised: February 2, 2024
Released: February 2, 2024
PK STORM ST-5000 - ST-8000
Pressure Drop vs. Flow
MAX FLOW ST-5000
@20°F ΔT
485GPM @ 26.1ft
150
200
250
300
350
P-K STORM
ST-5000
485 GPM
161.7 GPM (Flow
Switch Setting)
Patterson-Kelley 2024
All Rights Reserved.
Technical Service 1.877.728.5351
MAX FLOW ST-6000
@20°F ΔT
582GPM @ 37.6ft
400
450
500
550
Flow Rate (GPM)
®
Flow Rate
ST-6000
582 GPM
194 GPM (Flow
Switch Setting
®
P-K Storm
Gas Fired Boiler
MAX FLOW ST-8000
@20°F ΔT
776GPM @ 66.9ft
600
650
700
750
Approximate
ST-8000
776 GPM
258.7 GPM (Flow
Switch Setting)
2691000403 P-K Storm ST2500-ST8000
Installation and Owners Manual Rev G.docx
800
850
ΔT
20 °F
60 °F
Page 125
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