2 HP Stainless Steel Multistage Booster Pump – 220V, 60Hz

The CNP CHL4-40LDSR stainless steel booster pump is a powerful horizontal multistage centrifugal pump designed for residential, commercial, water treatment, ozone, irrigation, transfer, and pressure boosting applications.

With a 2.0 HP, 220V single-phase motor, stainless steel wetted components, and a special Viton mechanical seal for improved ozone resistance, this pump combines high pressure, strong flow, quiet operation, and corrosion resistance in a compact design.

This is an excellent choice when a conventional smaller booster pump cannot provide enough pressure for a large home, multi-story building, atmospheric storage tank, ozone aeration system, radon treatment system, water treatment system, or other application requiring strong pressure at higher flow rates.

Why Choose This Pump?

• High pressure and high flow: Produces approximately 67 PSI at 17.6 GPM.
• Up to approximately 35 GPM: Delivers about 44 PSI at 35.2 GPM based on the CHL4-40 60Hz pump curve.
• Excellent for multi-story homes: Provides significantly more head pressure than typical small residential booster pumps.
• 2.0 HP motor: Strong performance for whole-house pressure boosting and water treatment applications.
• 304 stainless steel wetted components: Designed for clean water and many treated-water applications.
• Special Viton mechanical seal: These pumps are specially ordered for Clean Water Store with Viton seals for improved resistance to ozone and chemically treated water.
• Suitable for ozone applications: Excellent for ozone aeration, radon treatment, storage tanks, and other ozone-related water treatment systems.
• Multistage design: Multiple impellers generate substantially higher pressure than a conventional single-stage centrifugal pump.
• Compact horizontal design: Fits easily into pump rooms, basements, utility rooms, and treatment equipment areas.
• Quiet operation: Horizontal multistage pumps typically operate more smoothly and quietly than many conventional booster pump designs.
• 220V single-phase: Suitable for many residential and light commercial installations with 220–240V power available.

Actual CHL4-40 60Hz Pump Performance

The following values are based on the CHL4-40 operating at 60Hz. Actual system pressure will vary depending on elevation, pipe size, pipe length, fittings, valves, filters, and other restrictions.

Important: The PSI figures above represent pump head pressure at the pump itself. Pressure available at the fixture will be lower after accounting for elevation and plumbing friction.

Excellent for Multi-Story Homes

This pump is especially useful when water must be pushed vertically through a two-story or three-story home.

As a general rule, every 2.31 feet of vertical elevation requires approximately 1 PSI. A fixture located 40 feet above the pump will therefore lose approximately 17 PSI from elevation alone.

For example, if the pump is delivering approximately 67 PSI at 17.6 GPM, a fixture located 40 feet above the pump could theoretically receive about 50 PSI before pipe and fitting losses are included.

This makes the CHL4-40 a much better choice than smaller booster pumps where strong shower pressure or higher simultaneous household flow is required.

Ideal Applications

• Whole-house water pressure boosting
• Two-story and three-story homes
• Atmospheric water storage tanks
• Ozone aeration systems
• Radon treatment and aeration systems
• Water treatment systems
• Well water treatment installations
• Domestic water supply
• Rainwater storage and reuse systems
• Irrigation systems
• Commercial water boosting
• Wash-down systems
• Cooling water circulation
• Water transfer
• Light industrial water service
• Aquaculture

Technical Specifications

• Model: CNP CHL4-40LDSR
• Pump type: Horizontal multistage centrifugal booster pump
• Motor: 2.0 HP / 1.5 kW
• Voltage: 220V
• Frequency: 60Hz
• Phase: Single phase
• Motor speed: Approximately 3500 RPM at 60Hz
• Current: Approximately 5.6 amps
• Maximum listed flow: Approximately 35.2 GPM
• Performance at 17.6 GPM: Approximately 154 ft of head / 67 PSI
• Performance at 35.2 GPM: Approximately 102 ft of head / 44 PSI
• Motor protection: IP55
• Motor insulation: Class F
• Installation: Horizontal
• Pump construction: Stainless steel multistage impeller and diffuser design
• Wetted metal components: 304 stainless steel
• Mechanical seal: Special Viton mechanical seal for improved ozone resistance
• Warranty: 1 year

Dimensions

• Approximate pump size: 15" x 6" x 10"
• Pump weight: Approximately 29 lbs
• Shipping weight: Approximately 45 lbs

Stainless Steel Construction

The pump uses a horizontal multistage design with stainless steel impellers and diffusers. Multiple stages progressively increase the pressure while maintaining strong flow.

• 304 stainless steel wetted metal parts
• Stainless steel impellers
• Stainless steel diffusers
• Stainless steel pump housing
• Corrosion-resistant construction
• Suitable for clean water and many treated-water applications

Special ozone-resistant Viton seal: This pump is specially configured for Clean Water Store with a Viton mechanical seal. Viton provides improved resistance to ozone and many chemically treated water applications compared with standard elastomers.

If you are pumping water with unusual chemistry, high chemical concentrations, solvents, acids, or other aggressive liquids, contact us before ordering so we can verify material compatibility.

Designed for Ozone Water Treatment Applications

This version of the CHL4-40 is specially ordered with a Viton mechanical seal, making it particularly well suited for ozone-related water treatment applications.

Ozone can be hard on conventional elastomers and standard pump seals. Viton provides improved resistance to ozone exposure, helping make this pump a better choice for ozone aeration tanks, radon treatment systems, ozone contact systems, and atmospheric storage tank applications.

Although this pump configuration uses seals capable of elevated-temperature service, Clean Water Store does not recommend this pump for domestic hot-water applications.

Important Installation Information

• This is a non-self-priming centrifugal pump.
• The pump housing must be completely filled with water before startup.
• Do not operate the pump dry.
• Use a flooded suction whenever possible.
• When drawing from an atmospheric storage tank, install the pump below or near the bottom water level whenever practical.
• Keep the suction line short and adequately sized.
• Avoid unnecessary restrictions, small pipe, excessive elbows, or undersized valves on the suction side.
• Use appropriate dry-run or low-water protection when pumping from a storage tank.
• The motor is water resistant but should be protected from direct rain, flooding, and direct spray.
• Install indoors or in a properly ventilated weather-protected enclosure.
• Electrical installation should comply with applicable electrical codes.
• Use properly sized circuit protection and wiring.

Using This Pump With an Atmospheric Storage Tank

This pump works particularly well as a booster pump after an atmospheric water storage, aeration, radon, or ozone treatment tank.

A typical installation can be arranged as:

Atmospheric Storage Tank → Booster Pump → Pressure Tank → Pressure Switch → House Plumbing

When used this way, the booster pump creates the household water pressure rather than relying on pressure from the incoming well pump.

We recommend installing a low-water shutoff or dry-run protection device so the pump cannot continue running if the storage tank becomes empty.

Pressure Tank and Pressure Switch

For conventional residential pressure boosting, this pump can be used with a properly sized pressure tank and pressure switch.

A common residential arrangement may use a 40/60 PSI pressure switch, depending on system requirements and elevation.

The pressure tank reduces pump cycling by storing pressurized water. Larger pressure tanks generally provide greater drawdown and reduce the number of motor starts.

Contact us if you need assistance selecting the proper pressure tank or pressure switch for your application.

How Much Pressure Will I Have Upstairs?

Elevation reduces pressure by approximately 0.433 PSI per vertical foot.

• 10 ft elevation = approximately 4.3 PSI loss
• 20 ft elevation = approximately 8.7 PSI loss
• 30 ft elevation = approximately 13 PSI loss
• 40 ft elevation = approximately 17.3 PSI loss
• 50 ft elevation = approximately 21.7 PSI loss

Additional pressure will be lost from pipe friction, fittings, valves, check valves, filters, and other restrictions.

For accurate sizing, you need to consider both the required flow rate and the total dynamic head of the system.

Frequently Asked Questions

Is this really a 2 HP pump?

Yes. The CHL4-40 uses a 1.5 kW motor, which is approximately 2 horsepower.

Is this pump 110V or 220V?

This model is designed for 220V, 60Hz operation. Verify that the installation has the correct electrical service before ordering.

Is it single phase?

Yes. This Clean Water Store version is configured for 220V single-phase power.

How many gallons per minute can it pump?

The CHL4-40 pump curve extends to approximately 35 GPM. However, pump pressure decreases as flow increases. Pump selection should always be based on both required GPM and required pressure.

How much pressure does it make at 15 to 18 GPM?

At approximately 17.6 GPM, the pump curve shows approximately 154 feet of head, which is about 67 PSI.

Does it make 67 PSI all the time?

No. A centrifugal pump does not produce one fixed pressure at every flow rate. Pressure varies according to flow. As flow increases, available pump head generally decreases.

Can I use it in a three-story home?

Yes, this pump can be an excellent choice for a multi-story home when properly sized. Remember that elevation reduces pressure by approximately 0.433 PSI per vertical foot.

Can this pump be used with ozone?

Yes. This pump is specially ordered by Clean Water Store with a Viton mechanical seal for improved ozone resistance. This makes it a good choice for ozone aeration systems, radon treatment systems, atmospheric storage tanks, and other applications where ozone may be present in the water or treatment process.

Is this a standard CHL4-40 pump?

The hydraulic pump model is based on the CNP CHL4-40 series, but this Clean Water Store version is specially configured with a Viton mechanical seal for ozone service.

Can this pump pull water from a storage tank?

Yes, but the pump is not self-priming. A flooded suction arrangement is preferred, with the pump located below or close to the water level in the tank.

Can I run the pump dry?

No. Running a centrifugal pump dry can damage the mechanical seal and other components. Use low-water or dry-run protection when there is any possibility of the water source becoming empty.

Does it require a pressure tank?

For a conventional residential pressure-switch system, a pressure tank is normally recommended. It reduces rapid cycling and provides stored pressurized water between pump cycles.

Can I use a 40/60 pressure switch?

A 40/60 PSI pressure switch can be suitable for many residential booster applications with this pump. Final pressure settings should be based on elevation, plumbing, required fixture pressure, and pump performance.

Can this pump be installed outdoors?

The motor has water-resistant construction, but it should not be exposed directly to rain, flooding, sprinklers, or pressure washing. Install it in a dry, ventilated, weather-protected location.

Is this pump quiet?

Yes. The multistage centrifugal design is generally smooth and relatively quiet when properly installed, primed, and supplied with unrestricted water flow.

Can it pump hot water?

The special seal configuration is capable of elevated-temperature service; however, Clean Water Store does not recommend this pump for domestic hot-water applications.

Can it handle sand or sediment?

No. This pump is intended for clean water. Sand, grit, scale, or abrasive solids can damage the impellers, diffusers, and mechanical seal. Install appropriate sediment filtration upstream when necessary.

Can I use it with chlorinated water?

It is commonly suitable for treated water, but compatibility depends on concentration, temperature, pH, and overall water chemistry. Contact us for unusual or aggressive water conditions.

Can it be used after an ozone aerator or radon system?

Yes. This is one of the applications for which this pump is particularly well suited. The stainless steel construction and Viton mechanical seal make it a strong choice for pumping from atmospheric ozone aeration and radon treatment tanks.

Can it be used after a water treatment system?

Yes. It can be used after atmospheric storage tanks, aeration systems, ozone systems, radon systems, and many other water treatment systems where additional household pressure is required.

Can it be used before a water filter?

Yes, provided the pump is properly sized to overcome the pressure loss through the filters at the required flow rate. Backwashing filters can require significant flow, so system sizing is important.

What pipe size should I use?

Avoid undersized piping, especially on the suction side. Larger piping reduces friction loss and helps the pump deliver its rated performance. Pipe sizing depends on flow rate, run length, elevation, and installation layout.

Why is my pressure lower than the pump curve?

The pump curve represents pressure produced at the pump under controlled conditions. Real installations lose pressure through elevation, pipe friction, elbows, valves, check valves, fittings, filters, and other restrictions.

What does multistage mean?

Instead of using a single impeller, a multistage pump passes water through several impellers in sequence. Each stage adds additional pressure, allowing the pump to produce high pressure while still maintaining useful flow.

Why use a Viton seal?

Viton is highly resistant to ozone and many chemicals that can attack ordinary rubber seal materials. This is especially useful in ozone water treatment and aeration applications.

What is the warranty?

This pump includes a 1-year warranty. Proper installation, priming, electrical supply, freeze protection, and protection against dry running are important for reliable service.

Need Help Sizing Your Booster Pump?

Choosing a booster pump based only on horsepower can result in too little pressure, too much pressure, or inadequate flow.

For help selecting the correct pump, provide us with:

• Desired gallons per minute
• Desired operating pressure
• Vertical elevation from the pump to the highest fixture
• Pipe size
• Approximate pipe length
• Number of floors
• Water source: well, storage tank, cistern, or municipal water
• Any filters, softeners, aerators, ozone systems, UV systems, or other equipment in the water line

Our water treatment specialists can help determine whether this pump is appropriate for your application.

Pump Performance Curve

Always refer to the pump curve when selecting a pump. The correct operating point is determined by the intersection of the pump performance curve and the total resistance of your plumbing system.

Pump Connections

220V Wiring