P-K MACH
®
Gas Fired Boiler
Technical Service 1.877.728.5351
Revised: January 3, 2020
Released: January 3, 2020
Patterson-Kelley 2020
All Rights Reserved.
1004905981 P-K MACH C1500H-C4000 Installation and
Owners Manual (Rev F Jan-2020).docx
Page 124
Hydronics/Water Flow (C-2500, C-3000 & C-4000)
The chart below represents the pressure drop (Ft of Head) versus the water flow rate (GPM) for the
MACH C-2500, C-3000 & C-4000. 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 connected piping, valves, strainers, couplings, flanges, etc.
The table below summarizes the minimum and maximum flow restrictions for the MACH C-2500/3000:
Flow Condition
Boiler Operation
C-2500
Flow Rate
C-3000
Flow Rate
Approximate ΔT
Maximum Flow
High Fire
238 GPM
285 GPM
20°F
Minimum Flow
High Fire
120 GPM
143 GPM
40°F
Minimum Flow
Ignition
60 GPM
72 GPM
40°F
Minimum Flow
Low Fire
47 GPM
57 GPM
20°F
The table below summarizes the minimum and maximum flow restrictions for the MACH C-4000:
Flow Condition
Boiler Operation
Flow Rate
Approximate ΔT
Maximum Flow
High Fire
380 GPM
20°F
Minimum Flow
Low Fire
190 GPM
40°F
Minimum Flow
Ignition
95 GPM
40°F
Minimum Flow
Low Fire
76 GPM
20°F
