1. Shallow Well vs. Deep Well Jet Pumps
To understand if a jet pump works for your well, you first need to define "deep." In the water pump industry, the cutoff is typically 25 feet (7.6 meters).
Shallow Well Jet Pumps: The "jet" assembly (the nozzle and venturi) is built into the pump housing itself. These can only pull water from depths of 25 feet or less.
Deep Well Jet Pumps (Convertible): For wells deeper than 25 feet—ranging up to 110–120 feet—the jet assembly is detached from the pump and submerged deep into the well.
A deep well jet pump operates on a "twin-pipe" system. Unlike a standard pump that only pulls water up, a deep well jet pump cycles some water back down.
Pressure Pipe: The pump pushes a portion of water down into the well through a pressure pipe.
The Jet Assembly: At the bottom, this water passes through a narrow nozzle and venturi, creating a high-velocity vacuum.
Suction & Lift: This vacuum draws in additional well water and "pushes" it back up the larger suction pipe toward the surface.
This bypasses the physical limit of atmospheric pressure, which prevents standard suction pumps from lifting water higher than 25–30 feet.
If you decide to use a jet pump for your deep well, pay close attention to these three factors:
Because a deep well jet pump uses two pipes, your well casing must be wide enough to accommodate them (usually a mini
of 4 inches).
Suction Pipe: Typically 1.25 inches.
Pressure (Drive) Pipe: Typically 1 inch.
Material: High-density polyethylene (HDPE) or PVC is preferred to prevent corrosion over time.
A high-quality foot valve is mandatory. It acts as a one-way check valve at the bottom of the assembly, ensuring the water doesn't drain out of the pipes when the pump stops. If the foot valve leaks, the pump will lose its prime, and you may face motor burnout.
Deep well systems are significantly harder to prime than shallow ones because you must fill both the pump casing and the entire length of both pipes with water. Any air pocket in the 100-foot line can cause the system to fail.
A deep well jet pump is an excellent choice if your water level is between 25 and 120 feet and you want the convenience of having the motor accessible at the surface for repairs. However, if your well is deeper than 120 feet, or if you want the most energy-efficient setup, a submersible pump is the superior 2026 standard.
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