Product Overview
The Star 5STH 1/2 HP High Volume Utility Pump is engineered for efficient and rapid water removal and transfer. Its robust design makes it suitable for various applications, from emergency flood control to routine water management tasks.

Image: The Star 5STH 1/2 HP High Volume Utility Pump, a black submersible unit with a white discharge port and power cord.
Key Features
- High Efficiency Water Transfer: Moves water at 55 gallons per minute (3,318 GPH) at a 5-foot lift, ideal for fast flood water removal.
- Versatile Applications: Features a 2-inch NPT discharge with a barb hose adapter and can pump water down to 1 inch, suitable for farm, contractor, and rental use.
- Durable Construction: Heavy-duty submersible utility pump with a reinforced thermoplastic body that resists corrosion, stress, and heat.
- Efficient Motor: Equipped with a 1/2 HP 115V PSC motor, featuring built-in thermal overload protection and a vent hole to prevent air lock.
- Portable Design: Lightweight at only 16.5 pounds, includes a convenient carry handle, and a 9-foot double-sealed cord for complete submersion.
Important Safety Information
Always adhere to these safety guidelines to prevent injury or damage to the pump.
- Electrical Safety: Always disconnect the pump from the power source before performing any maintenance, cleaning, or servicing. Ensure the power cord and plug remain dry and are not submerged in water.
- Grounding: Connect the pump only to a properly grounded 115V electrical outlet. Do not remove the grounding prong from the plug.
- Liquid Compatibility: This pump is designed for water only. Do not use it to pump flammable liquids, corrosive chemicals, or liquids containing large solids.
- Operating Environment: Do not operate the pump in hazardous locations or where explosive gases are present.
- Personal Safety: Wear appropriate personal protective equipment, such as gloves and eye protection, when handling or servicing the pump.
- Children and Pets: Keep children and pets away from the pump and the area being drained during operation.
Understanding Utility Pump Types
The Star 5STH is a versatile utility pump. The following section explains different types of utility pumps and their applications, as demonstrated by Star Water Systems experts.
Video: An overview of the Star High Volume Utility Pump, highlighting its features and applications for immediate water removal.
Standard Submersible Utility Pump
This pump is designed for applications requiring immediate water removal, such as draining a flooded basement. The entire pump unit can be submerged in water, but it is crucial to ensure the three-prong electrical plug remains dry and is not submerged before plugging it into an outlet.

Image: A standard submersible utility pump, black in color, with a white discharge port and a power cord.
Standard Submersible Utility Pump with Automatic Sensor
Similar to the standard submersible pump, this model includes an automatic sensor. This sensor allows the pump to automatically shut off once all water has been evacuated, preventing the pump from running dry, which can cause damage. This feature provides added protection and convenience.

Image: A submersible utility pump, black, featuring a white automatic sensor mechanism on top, designed to prevent dry running.
Cast Iron Utility Pump (Transfer Pump)
This type of pump is not submersible. It is primarily known as a transfer pump, designed to move water from one location to another. Examples include filling an aquarium or transferring water between containers. It is suitable for situations where immediate, high-volume removal is not the primary concern.

Image: A black cast iron utility pump, non-submersible, with brass fittings, designed for water transfer.
Garden Hose Pump
The Garden Hose Pump is designed to work with any standard garden hose. It can be used with a puddle vac attachment to effectively vacuum up unwanted water from flat surfaces. This pump is ideal for smaller water removal tasks where a standard garden hose connection is convenient.

Image: A compact garden hose pump, black, shown with a green garden hose and a puddle vac attachment, used for removing water from flat surfaces.
Video: Star Water Systems experts explain how to choose the correct utility pump for various water moving scenarios, from emergency situations to routine tasks.
Setup Instructions
For Submersible Pumps (Star 5STH)
- Placement: Position the pump in the lowest point of the area that needs to be drained. Ensure it is stable and upright.
- Hose Connection: Attach a suitable discharge hose (not included) to the pump's 2-inch NPT outlet. Secure the hose firmly with a clamp to prevent accidental disconnection or leaks during operation.
- Discharge Route: Route the discharge hose to a safe and appropriate drainage area, ensuring the water will not re-enter the area being pumped or cause new flooding.
- Power Connection: Verify that the power cord and plug are completely dry. Connect the pump to a properly grounded 115V electrical outlet. Do not use extension cords unless absolutely necessary and ensure they are rated for outdoor use and wet conditions.
- Sensor Check (if applicable): For models equipped with an automatic sensor, ensure the sensor is free from any obstructions that could interfere with its operation.
Operating Instructions
For Submersible Pumps (Star 5STH)
- Initiating Operation: Once the pump is properly connected to power and submerged, it will begin to operate when water levels reach the intake. For manual models, simply plug the pump into the outlet to start and unplug to stop.
- Monitoring: Continuously monitor the pump's operation to ensure efficient water removal and to check for any issues such as clogs or unusual noises.
- Preventing Dry Running: Do not allow the pump to run dry for extended periods, especially manual models without an automatic sensor, as this can lead to overheating and severe damage to the motor.
- Post-Operation: After the desired water level is reached or the area is drained, disconnect the pump from the power source. Follow the cleaning and storage procedures outlined in the maintenance section.
Maintenance
Regular maintenance ensures the longevity and optimal performance of your Star 5STH utility pump.
- Inspection: Periodically inspect the pump for any signs of wear, damage, or corrosion. Pay close attention to the power cord for cuts or fraying, and the impeller for debris or damage.
- Cleaning Intake Screen: The intake screen can become clogged with debris, reducing pump efficiency. Regularly clean the intake screen to ensure unrestricted water flow.
- Storage: When the pump is not in use, especially during off-seasons, clean it thoroughly and store it in a dry, protected area where it is safe from freezing temperatures and direct sunlight.
- Winterization: If storing in an unheated area, ensure all water is drained from the pump to prevent freezing and potential damage.
Troubleshooting
Refer to this table for common issues and their potential solutions.
| Problem | Possible Cause | Solution |
|---|---|---|
| Pump does not start | No power to the outlet; Clogged intake screen; Motor thermal overload tripped | Check power connection and circuit breaker; Clear debris from intake screen; Allow motor to cool and reset (unplug and replug). |
| Pump runs but no water moves | Air lock in the pump; Clogged discharge hose; Damaged impeller | Slightly tilt the pump to release trapped air; Clear any obstructions in the discharge hose; Inspect and replace impeller if damaged. |
| Pump runs dry (manual models) | Water level too low | Unplug the pump immediately to prevent damage. Only operate when submerged. |
| Pump runs dry (automatic sensor models) | Sensor malfunction or obstruction | Check the sensor for debris or obstructions. Ensure it can move freely. |
Technical Specifications
| Feature | Detail |
|---|---|
| Brand | Star |
| Model Number | 5STH |
| Power | 1/2 HP |
| Voltage | 115 Volts |
| Maximum Flow Rate | 55 Gallons Per Minute (3,318 GPH) |
| Maximum Lifting Height | 5 Feet |
| Product Dimensions | 8"L x 12.2"W x 9.2"H |
| Item Weight | 10.8 Pounds |
| Material | Reinforced Thermoplastic |
| Discharge | 2 Inch NPT with barb hose adaptor |
| Cord Length | 9 feet (double-sealed) |
| Special Features | Built-in thermal overload protection, Vent hole to prevent air lock, Portable with carry handle |
Warranty Information
The Star 5STH 1/2 HP High Volume Utility Pump comes with a 1-year limited warranty. This warranty covers defects in materials and workmanship under normal use. For complete details regarding coverage, limitations, and how to file a claim, please refer to the official warranty documentation included with your product or visit the manufacturer's website.

Image: An icon indicating a 1-year limited warranty.
Customer Support
For further assistance, technical support, or to purchase replacement parts, please visit the official Star Water Systems website: