P-K Storm
TM
Gas Fired Boiler
Technical Service 1.877.728.5351
Revised: October 2, 2019
Released: October 2, 2019
Patterson-Kelley 2019
All Rights Reserved.
2691000099 P-K Storm Installation and Owners
Manual.docx
Page 85
The chart below represents the pressure drop (Ft of Head) versus the water flow rate (GPM) for the P-K
STORM ST-1250 through ST-2000. 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.
P-K STORM
™
ST-1250 through ST-2000 Boilers: Minimum & Maximum Flow Rates
Flow
Condition
Boiler
Operation
Flow Rate
Approximate
ΔT
ST-1250
ST-1500
ST-1750
ST-2000
Maximum Flow High Fire
121 GPM
146 GPM
170 GPM
194 GPM
20 °F
Minimum Flow
High Fire
38 GPM
(Flow
Switch
Setting)
46 GPM
(Flow
Switch
Setting)
54 GPM
(Flow
Switch
Setting)
62 GPM
(Flow
Switch
Setting)
60 °F
Minimum Flow
Ignition
Minimum Flow
Low Fire
MAX FLOW ST-1250
@20°F
Δ
T
121GPM @ 18.8ft
MAX FLOW ST-1500
@20°F
Δ
T
146GPM @ 23ft
MAX FLOW ST-1750
@20°F
Δ
T
170GPM @ 20 ft
MAX FLOW ST-2000
@20°F
Δ
T
194GPM @ 26 ft
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
0
20
40
60
80
100
120
140
160
180
200
Pr
e
ssur
e
Dr
o
p
(Ft.
H
e
ad
)
Flow Rate (GPM)
P-K STORM ST-1250 - ST-2000
Pressure Drop vs. Flow