Jet Pump Installation Guide: Shallow Well vs. Deep Well Systems Explained

By the Watermain Supply Technical Team | Authorized Baker Water Systems Dealer | Updated March 2026

Your well pump is one of those things you don't think about - until the water stops. We've fielded thousands of calls from homeowners, plumbers, and well drillers over the years, and nine times out of ten, a jet pump problem traces back to one of two things: a component that was skipped on installation, or the wrong pump chosen for the well depth.

This guide covers everything you need for a correct jet pump installation - from how the pump actually creates suction, to every component required for shallow well and deep well systems, to installation costs, sizing rules, and the most common problems we see in the field. If you're spec'ing a new system or troubleshooting an existing one, this is your reference.

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How a Jet Pump Works (The Physics Behind the Pull)

A jet pump doesn't push water up from below - it pulls it. That distinction matters for installation, sizing, and troubleshooting, so it's worth understanding before you turn a wrench.

Inside the pump (or down in the well, depending on configuration) sits a jet ejector: a precision-machined nozzle and venturi assembly. The pump forces water through the nozzle at high velocity. As that pressurized stream passes through the narrow venturi throat, it accelerates and creates a localized vacuum. That vacuum is what draws water from the well into the system.

Think of it like a garden hose with a spray nozzle - water speeds up as it exits the narrower opening, and anything held near that stream gets pulled toward it. A jet ejector applies that same principle continuously, at scale, to pull well water to the surface.

Where the ejector lives determines everything about the system. Shallow well pumps keep the ejector inside the pump body, sitting above ground. Deep well systems send the ejector down into the well casing, submerged below the water level. Same physics, different configuration.

Shallow Well Jet Pump Installation

A shallow well system is the simplest jet pump configuration. Everything mechanical lives above ground - pump, pressure switch, tank - and a single suction pipe runs from the pump down to the water source. If your water table sits within 25 feet of the pump elevation, this is your setup.

We install these in basements, utility rooms, pump houses, and well pits. They pull from wells, springs, cisterns, ponds, and lakes. The limiting factor is physics, not equipment: atmospheric pressure puts a hard ceiling on how high any suction-based pump can lift water. At sea level, that ceiling is about 25 feet. At higher elevations, it drops.

Required Components for a Shallow Well System

1. Jet Pump with Built-In Ejector

The shallow well pump houses the nozzle-venturi assembly directly inside the pump body. Baker's 8100 series and 8500 series are purpose-built for this configuration. When you're choosing between models, the trade-off is simple: high-capacity models deliver more GPM at lower pressure (better for irrigation or homes with high demand), while high-pressure models sacrifice some flow for higher PSI (better if you're pushing water through a long pipe run or up a significant elevation).

2. Foot Valve

The foot valve installs at the bottom of the suction pipe, submerged in the water source. It has two jobs: a strainer that keeps debris out of the system, and a check valve that holds water in the pipe when the pump shuts off.

We've rebuilt a lot of pumps that failed prematurely because the foot valve was undersized, corroded, or just cheap. When the foot valve leaks, the pump loses its prime every cycle - the motor runs, the impeller spins, but there's no water to push. Run a jet pump dry long enough and you'll damage the mechanical seal and impeller. Use a quality valve. Baker's 400SB silicon bronze foot valve is rated to 400 PSI and handles years of continuous use without issue.

3. Check Valve (Discharge Side)

A check valve on the pump's discharge outlet prevents pressurized water from backflowing through the system when the pump shuts off. Install it between the pump and the pressure tank. Baker offers both horizontal and vertical models - choose based on how your pipe run is oriented.

4. Pressure Switch

The pressure switch reads system pressure and cycles the pump on and off automatically. When pressure drops (someone opens a faucet), the switch triggers. When the system reaches the cutout setting, the pump shuts off. Baker shallow well pumps come factory-set at 20/40 PSI or 30/50 PSI depending on the model. The switch is field-adjustable - each full turn of the adjustment screw moves the setting approximately 2 PSI.

A 30/50 setting is the most common residential configuration. It means the pump kicks on when pressure drops to 30 PSI and shuts off at 50 PSI. If you're running irrigation or a multi-story home, consider bumping to 40/60 - just verify the pump is rated for it.

5. Pressure Tank

The pressure tank is the most underrated component in the system. Three things happen inside it that directly affect your pump's lifespan and your water pressure consistency.

First, it stores a reserve of pressurized water so the pump doesn't run every time you open a tap for three seconds. Second, it smooths out pressure fluctuations between cycles - you won't feel surges in the shower. Third, and most importantly, it dramatically reduces how many times the pump motor starts and stops per day. Electric motors take a surge of current at startup, and heat builds with every cycle. A properly sized tank can cut daily starts by 70-80% versus running with an undersized or waterlogged tank.

Minimum recommendation for a single-family home: 20-gallon tank. Homes with multiple bathrooms, irrigation, or high demand: step up to 35 or 52 gallons. Bigger is always better here.

6. Pressure Gauge

A 0-100 PSI gauge mounted on the tank tee gives you a real-time read on system pressure. It costs almost nothing and is the first thing we look at on a service call. Install it - don't skip it.

Deep Well Jet Pump Installation

When the water table drops below 25 feet, the shallow well configuration loses the physics fight. You need to move the ejector down into the well - close enough to the water that the suction distance becomes manageable. That's what a deep well jet pump does.

The pump body still sits above ground, which is one of the main reasons contractors and homeowners choose jet systems over submersibles: you can service everything without pulling pipe from the well. The trade-off is complexity. A deep well setup runs two pipes into the well casing and requires a precisely matched ejector package for the depth and pump horsepower.

Baker's 8200 series convertible pumps and 8000 series convertible pumps handle this configuration and can reach depths of 90 to 120+ feet depending on the ejector package selected. We've installed plenty of these in the 60-90 foot range with excellent results.

Additional Components for Deep Well Systems

Everything from the shallow well list applies, plus the following:

Jet Ejector (Down-Well Assembly)

Instead of the ejector living inside the pump, it now packages separately and installs at the bottom of the well, submerged below the water level. The ejector consists of the nozzle, venturi, and foot valve in one assembly. Baker offers ejector packages for both 2-inch and 4-inch well casings. Critical point: the ejector must be matched to the pump horsepower and the well depth. An undersized ejector on a deep installation won't develop enough vacuum. An oversized one wastes energy and reduces flow. We can help you spec the right package if you know your pump model and depth.

Two-Pipe System (Drive Pipe + Suction Pipe)

The drive pipe carries pressurized water from the pump down to the ejector. The suction pipe carries the combined flow - recirculated water plus new well water - back up to the pump. Both pipes run from the pump head, through the well seal or pitless adapter, and down to the ejector.

Pipe sizing is not optional. Undersized pipes create friction losses that choke performance on deep wells. Follow the manufacturer's sizing table for your pump model and depth. On installations below 60 feet, cutting corners on pipe diameter is the single most common cause of underperformance.

Casing Adapter

The casing adapter sits on top of the well casing and provides a sanitary transition point where the two pipes enter the above-ground system. It keeps the well sealed against surface contamination while allowing the pipe runs to pass cleanly through.

Well Seal or Pitless Adapter

In warm climates, a standard well seal at the top of the casing works fine. In northern states where the frost line runs 36 to 48 inches deep - and we see plenty of those installs - a pitless adapter is the right call. It routes the piping through the side of the casing below the frost line so above-ground connections don't freeze and crack in January.

Torrent Coupling & Reducing Nipple

The torrent coupling is a standard coupling bored on the outside to allow water to flow around the pipe inside the casing. The 1-1/4" x 1" NPT reducing nipple transitions the pipe sizes from the ejector return to the above-ground pump. Small components, but both are required for correct flow geometry.

Regulating Valve

The regulating valve attaches to the pump discharge and controls backpressure to the down-well ejector. This is the tuning component of a deep well system - getting it right is the difference between the pump performing at spec and running inefficiently. Baker jet pumps feature an internal regulating valve with accessible field adjustment. Set it per the manufacturer's pressure curve for your depth and ejector package.

Choosing the Right System: Shallow Well vs. Deep Well vs. Submersible

	Shallow Well Jet	Deep Well Jet	Submersible
Well Depth	Up to 25 ft	25 – 120+ ft	Any depth
Pump Location	Above ground	Above ground	Down in well
Maintenance Access	Easy	Easy	Requires pulling pump
Max Flow Rate	Up to 25 GPM	Up to 20 GPM	Up to 50+ GPM
Installation Cost	$200 – $500	$350 – $750	$500 – $1,200+
Noise Level	Audible above ground	Audible above ground	Near-silent
Best For	Shallow wells, springs, cisterns	Mid-depth private wells	Deep wells, high demand

Pro Installation Tips

These aren't filler tips you'll find in any generic plumbing guide. They come from real installs and real callbacks.

Always Use a Quality Foot Valve

We've seen homeowners drop $400 on a pump and then connect it to a $12 plastic foot valve from a big-box store. Six months later they call us wondering why the pump won't hold prime. The foot valve is the first thing that fails and the last thing people think about. Baker's 400SB silicon bronze valve costs a bit more and lasts decades. Use it.

Size the Pressure Tank Up, Not Down

If you're torn between a 20-gallon and a 35-gallon tank, take the 35. Rapid pump cycling is the number-one cause of early motor failure in jet pump systems. Every time that motor starts, it takes a current surge and generates heat. A larger tank reduces daily starts significantly. The payback in motor longevity is worth far more than the extra cost of a bigger tank.

Set the Air Charge Before You Start the System

Diaphragm pressure tanks need the air precharge set before the system goes live. The rule: set the tank air pressure 2 PSI below the switch cut-in pressure. Running a 30/50 switch? Precharge the tank to 28 PSI. Check it with the pump off and system depressurized. If the air charge is off, the tank can waterlog in weeks, which destroys its ability to buffer pump cycling. Check it annually.

Prime the Pump Before First Start - No Exceptions

Running a jet pump dry, even for 30 seconds, can score the mechanical seal and score the impeller housing. Fill the pump housing and the entire suction line with water before you turn on power. On a deep well system, prime both pipes. Once the system is running and holding pressure, you're good. But that first dry start is a warranty-voiding, pump-killing mistake we see regularly.

Don't Over-Tighten Brass Fittings

Brass cracks. Hand-tight plus a quarter turn with a wrench is the standard. Three to five wraps of Teflon tape in the direction of threading on all connections. Over-tightening creates hairline cracks that don't show up immediately - they show up three months later as a slow leak behind the pressure tank.

Dedicated Circuit, Correctly Sized

Baker jet pumps draw between 5 and 15 amps depending on horsepower and voltage. Check the nameplate - don't guess. Size the circuit breaker and wire gauge to the nameplate specs with a safety margin. Running a 1.5 HP, 240V pump on undersized wire causes voltage drop, the motor runs hot, and the capacitor fails early. A dedicated circuit also prevents nuisance tripping when something else kicks on.

Jet Pump Troubleshooting Guide

The most common jet pump problems have straightforward causes. Start here before you replace anything.

Problem: Pump Won't Prime / No Water

Check the foot valve first. Pull the suction pipe and test whether the valve holds water. A leaking foot valve drains the prime every cycle.
Check for air leaks in the suction line. Any small crack or loose fitting above the water line lets air in and breaks prime. Pressure-test the suction side.
Check the water level. If the well has dropped below the foot valve, the pump will run but pull air. This happens during drought conditions on shallow wells.
On a deep well system, verify the ejector is fully submerged. If the water table dropped, the ejector may be above the water line.

Problem: Pump Short-Cycles (Turns On and Off Rapidly)

Waterlogged pressure tank is the most common cause. Shut off the pump, drain the tank, check the precharge pressure. If the tank has no air left, the diaphragm has likely failed - replace the tank.
Pressure switch set too close. If cut-in and cutout are too close together (e.g., 25/30 instead of 30/50), the pump will short-cycle under normal demand. Verify switch settings.
Check valve on discharge failing. If the check valve leaks, pressure bleeds back after the pump shuts off and the pump starts again prematurely.

Problem: Low Water Pressure

Check the pressure switch settings. A switch that's out of calibration may be cutting out at 40 PSI when it should be 50 PSI.
On a deep well system, adjust the regulating valve. Incorrect backpressure to the ejector reduces flow efficiency at depth.
Check for partially closed valves in the supply line - it happens more often than you'd think after maintenance.
Verify pipe sizing on deep installations. Undersized pipe creates friction loss that shows up as low pressure at the fixtures.

Problem: Pump Runs But No Water Delivered

Impeller or diffuser damage from dry running. If the pump was ever run without prime, internal components may be scored. Inspect the pump end - replacement impeller kits are available for Baker pumps.
Ejector clogged or corroded (deep well). The nozzle and venturi on the down-well ejector can plug with scale or debris. Pull the ejector and inspect.
Well yield issue. In periods of heavy draw or drought, some shallow wells can't keep up. This isn't a pump problem - it's a hydrology problem. A well driller can assess the recovery rate.

Complete Jet Pump Component Checklist

#	Component	Shallow Well	Deep Well	Purpose
1	Jet Pump (built-in ejector)	Required	—	Creates suction, pressurizes system
1A	Convertible Pump (separate ejector)	—	Required	Same pump body, two-pipe deep well use
2	Foot Valve	Required	Built into ejector	Holds prime, filters debris at water source
3	Check Valve (horizontal or vertical)	Required	Required	Prevents reverse flow on discharge side
4	Pressure Switch	Required	Required	Auto-cycles pump based on system pressure
5	Pressure Tank	Required	Required	Stores water, reduces pump cycling
6	Pressure Gauge	Required	Required	Real-time system pressure monitoring
7	Jet Ejector (down-well assembly)	—	Required	Creates vacuum at depth; must match pump HP
8	Drive Pipe	—	Required	Carries pressurized water to down-well ejector
9	Suction Pipe (return)	Single pipe	Required	Returns combined flow from ejector to pump
10	Torrent Coupling	—	Required	Allows water flow around pipe in casing
11	Reducing Nipple (1-1/4" x 1" NPT)	—	Required	Transitions pipe sizes at ejector return
12	Casing Adapter	Optional	Required	Seals and connects pipes at well casing top
13	Regulating Valve	—	Required	Controls backpressure to down-well ejector
14	Well Seal / Pitless Adapter	Recommended	Required	Sanitary seal at casing; pitless for freeze climates
15	Well Point (sandy soil only)	Optional	Optional	Driven screen for sandy soil water extraction

Frequently Asked Questions About Jet Pump Installation

These are the questions our team gets most often - from homeowners doing their first installation and from experienced plumbers double-checking specs.

1. How deep can a shallow well jet pump pull water?

At sea level, about 25 feet measured vertically from the pump down to the water surface. That number drops at higher elevations because there is less atmospheric pressure available to push the water up. At 5,000 feet elevation, expect the practical limit to drop to around 20–22 feet. If your static water level is borderline, measure carefully and plan for seasonal fluctuation before committing to a shallow well setup.

2. Do I need a pressure tank with a jet pump?

Yes - and size it correctly. A jet pump without a pressure tank would cycle on and off every few seconds under normal household use. Each motor start creates heat and electrical stress. Even a small 2-gallon tank is technically functional, but it provides almost no protection against short-cycling. Minimum 20 gallons for a single-family home; 35 gallons or more for homes with irrigation or multiple bathrooms.

3. Why won't my jet pump prime?

The most common cause is a failed or leaking foot valve at the bottom of the suction pipe. When the foot valve can't hold water in the pipe, the pump loses prime every time it shuts off. The second most common cause is an air leak somewhere in the suction line — any small crack or loose fitting above the water surface will let air in and break the prime. Check the foot valve first, then pressure-test the suction pipe.

4. How long does a jet pump last?

A well-installed jet pump with a correctly sized pressure tank, quality foot valve, and properly charged tank air bladder should last 10–15 years with routine maintenance. We've seen Baker pumps run 20+ years in good conditions. The most common early failures are from rapid cycling (undersized tank), dry running (failed foot valve or air leak), and voltage issues (wrong circuit sizing). Get those three things right and the pump will outlast most of the plumbing connected to it.

5. What's the difference between a convertible pump and a regular jet pump?

A convertible pump is designed to operate in either shallow well or deep well mode. The pump body is the same; the ejector package differs. In shallow well mode, a built-in ejector nozzle is used and only one pipe runs to the well. In deep well mode, the built-in ejector is removed and replaced by a down-well ejector assembly, and a two-pipe system is used. Baker's 8200 and 8000 series are both convertible. If you're unsure whether your water level will stay above 25 feet long-term, a convertible pump gives you flexibility.

6. Can I install a jet pump myself?

On a shallow well system - yes, a competent DIYer with basic plumbing skills can handle it. The install is straightforward: set the pump, connect the suction pipe to the foot valve, connect discharge to the pressure tank, wire the pressure switch. A deep well system is more involved. Two-pipe installation, ejector matching, and regulating valve adjustment require more care. If you've never done it before, having a plumber or well driller walk through it with you on the first install is worth the hour.

Shop Jet Pumps & Components at Watermain Supply

As an authorized Baker Water Systems dealer, we carry the complete lineup of Baker jet pumps - 8100 series shallow well, 8200 series convertible, 8000 series convertible, 8300 E-Series, 8500 series, and 8600 series - plus every ejector package, foot valve, check valve, pressure switch, pressure tank, and OEM repair part you need.

Need help sizing a system for your well depth and household demand? Contact our team — we spec Baker pump systems for homeowners, plumbers, and well drillers every day.

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Watermain Supply is an authorized Baker Water Systems dealer. Product recommendations reflect our genuine experience speccing and selling Baker equipment. Pricing estimates reflect typical market rates as of early 2026 and may vary by region.

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