The RJS-100-PREM is the traditional answer for a house on a shallow well. A cast iron casing and volute provide rigidity and long life, a glass-filled thermoplastic impeller resists wear, and a motor that runs on 115 or 230 volts lets you match your supply. The 1-1/4 inch FNPT suction intake keeps friction low on the pull from the well.
It is rated for 23 GPM and for wells down to 25 feet. That limit is a physical one. A jet pump that sits above the water cannot lift it more than the atmosphere allows, so beyond roughly 25 feet you need a convertible setup or a submersible. Compared with the RJS-75-PREM at 3/4 HP and 16 GPM, the 1 HP unit moves roughly 44 percent more water and handles a household better.
Ownership means keeping the suction side airtight, because a single leaking fitting breaks the prime. Fit a foot valve, prime the pump through the plug, and check the pressure tank and switch yearly. A jet pump is easy to service since everything is above ground, which is a real advantage over a submersible. Keep a spare pressure switch and foot valve on the shelf, and drain the pump before a hard freeze.
What works
- Cast iron casing and volute
- Selectable 115 or 230 V motor
- 23 GPM for household demand
- Easy above-ground service
Watch out for
- Hard limit at about 25 ft of lift
- Needs priming and a foot valve
- Louder than a submersible
Spec sheet
- Motor
- 1 HP, selectable 115 or 230 V
- Flow
- 23 GPM
- Well depth
- Down to 25 ft
- Casing
- Cast iron casing and volute
- Impeller
- Glass-filled thermoplastic
- Suction
- 1-1/4 inch FNPT






