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 121
Hydronics/Water Flow (C-1500H & C-2000H)
The chart below represents the pressure drop (Ft of Head) versus the water flow rate (GPM) for the
MACH C-1500H & C-2000H. 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 C-1500H:
Flow Condition
Boiler Operation
Flow Rate
Approximate ΔT
Maximum Flow
High Fire
141 GPM
20°F
Minimum Flow
High Fire
71 GPM
40°F
Minimum Flow
Ignition
36 GPM
40°F
Minimum Flow
Low Fire
28 GPM
20°F
The table below summarizes the minimum and maximum flow restrictions for the C-2000H:
Flow Condition
Boiler Operation
Flow Rate
Approximate ΔT
Maximum Flow
High Fire
188 GPM
20°F
Minimum Flow
High Fire
94 GPM
40°F
Minimum Flow
Ignition
47 GPM
40°F
Minimum Flow
Low Fire
38 GPM
20°F
