P-K SOLIS™
Gas Fired Boiler
Technical Service 1.877.728.5351
Revised: March 15, 2021
Released: March 15, 2021
Patterson-Kelley 2021
All Rights Reserved.
2701000090 P-K SOLIS NURO Installation and
Owners Manual (Rev A).docx
Page 98
Hydronics/Water Flow
The chart below represents the pressure drop (Ft of Head) versus the water flow rate (GPM) for the P-K
SOLIS™ SL-1500 through SL-3000 boilers. 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 SOLIS SL-1500 through SL-3000 Boilers: Minimum & Maximum Flow Rates
Flow
Condition
Boiler
Operation
Flow Rate
Approximate
∆
T
SL-1500
SL-2000
SL-2500
SL-3000
Maximum Flow High Fire
144 GPM
192 GPM
240 GPM
288 GPM
20 °F
Minimum Flow
High Fire
48 GPM
64 GPM
80 GPM
96 GPM
60 °F
Minimum Flow
Ignition
58 GPM
77 GPM
96 GPM
115 GPM
20 °F
Minimum Flow
Low Fire
20 GPM
20 GPM
25 GPM
25 GPM
15 °F