A homeowner with a lake-fed system (pump house 5' above water, 10' away; highest zone 50' up, 100' out) needed 20 GPM at 50' head for 10 rotors (1.65 GPM each) plus a garden hose. They considered 1.5 HP Flotec pumps (corrosion-resistant vs. cast iron) and a 42-gallon pressure tank.
Use at least a 2 HP pump for that demand. Cast iron is more repairable (motor removable without disturbing piping) despite higher cost. Choose the larger pressure tank—it reduces short-cycling, extending pump life. If power is 110V, stick with 1.5 HP (2 HP requires 220V and larger wire). For 110V, the 1.5 HP corrosion-resistant pump with a large tank is practical. Ensure foot valve and suction line are airtight.
Flotec 3/4 HP Pump Pressure Loss: Diagnose Pump vs. Well Supply
Well Pump Low Pressure: Check Recovery, Obstruction, Foot Valve
Choosing a Sprinkler Pump for Grey Water Recycling in the Caribbean
Pressure Tank Not Building Pressure – Bladder or Waterlogged
Gravity-Fed Irrigation from a Hand-Pumped Tank
Hydrotek 4000 Low Pressure Daytime—K-Rain Timer Solenoid or Supply
Irrigation Pump with Well-Mate Bladder Tank: No Pressure After Winter
Sprinkler Pump Suction Side Pressure Explosion: Water Hammer Mystery
Pump Cycles Slowly, Zone 5 Head Pops Up During Zone 1 Run
Diagnosing Fluctuating Pressure in a Deep Well Irrigation Pump
Sprinkler Pump Pressure Loss: Check Impeller and Suction Leaks
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