The Complete Guide to Buying a Submersible Pump

The Definitive Guide to Purchasing a Submersible Pump

A submersible pump is uniquely designed to operate fully submerged underwater, making it one of the most versatile pump types in the market. Its application spans across various settings and needs.

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Given the diverse range of submersible pumps available today, it’s crucial to comprehend the distinctions among them and identify essential features to consider when selecting a submersible pump.

This guide clarifies common queries regarding pumps, including: What exactly is a submersible pump? What is its operational mechanism? And which brands of submersible pumps are the best?

Known as sump pumps, submersible water pumps are centrifugal pumps (propelled by impellers) that can function while entirely submerged. They are hermetically sealed to safeguard the internal electrics. Submersible pumps may be air or oil-fueled and can be fitted with various impeller types to manage liquids and solids of different sizes and viscosities.

As mentioned, submersible water pumps are hermetically sealed to protect the inner electronics from water. They are especially useful in scenarios requiring continuous removal of unwanted water. A float switch regulates the operation; it detects water levels and activates the motor when necessary. The water is drawn into the pump and expelled through the impellers.

1. Step 1: The float switch identifies the presence of water.
2. Step 2: The float switch activates the pump motor.
3. Step 3: Impellers draw water inside the pump.
4. Step 4: Impellers eject the water from the pump away from your property.

To see a detailed demonstration of a submersible pump's operation, watch the video below.

Applications of Submersible Pumps

Submersible pumps serve an extensive range of applications. Their complexity often stems from this variety. For most individuals, a submersible pump can typically address one of the three main applications.

Irrigation

Submersible pumps are vital for various irrigation tasks, from watering gardens to draining ponds and aquariums. They are often integrated into rainwater harvesting systems, reducing reliance on mains water and offering long-term cost savings.

Pumping from Wells and Boreholes

These pumps excel at extracting water from deep wells and boreholes. Their compact design enables them to operate efficiently in confined spaces while consuming minimal energy.

Draining Unwanted Water

Submersible pumps are perfect for removing floodwater or other types of unwanted water. They're commonly found in basements or areas prone to flooding. The automatic feature of electric submersible pumps allows for unattended water removal.

The Oil Industry

While not the main reason for this guide, submersible pumps play a critical role in transporting oil from underground reservoirs to treatment facilities.

Can Submersible Pumps Operate Continuously?

Indeed, submersible pumps can run continuously if provided with an adequate water source. However, it’s essential to avoid running a submersible pump dry, as this could significantly damage the motor and components. We highly recommend selecting a pump equipped with a float switch for automatic operation.

Varieties of Submersible Pumps

As highlighted earlier, numerous types of submersible pumps exist. The two most prevalent categories are drainage submersible pumps and wastewater/sewage submersibles. The primary distinction lies in the types of liquid or waste they are designed to handle.

Drainage Submersible Pumps

Drainage pumps are primarily employed for water removal. Leading manufacturers like Grundfos and KSB produce these pumps, which cater to various applications. They are predominantly utilized to evacuate excess water from flooded basements. Always ensure you pump the water to a safe discharge location. A lifting station can also facilitate the safe expulsion of water away from your property.

Wastewater/Sewage Submersibles

When dealing with wastewater or sewage, heavy-duty options become necessary. The Calpeda GXCm 40b serves as an excellent choice for dirty water applications and is ideal for tasks like emptying septic tanks or managing wastewater from industrial processes.

Selecting from Various Submersible Pump Brands

Different brands offer various products tailored to specific applications. Some pumps can handle high-viscosity liquids quickly, while others are optimized for extended use and efficiency.

Grundfos

Grundfos stands as the largest pump brand in the UK, renowned for its innovative technology and trusted among engineers. Their pumps are meticulously engineered and constructed, though they come at a premium price point.

Stuart Turner

Recognized globally for quality and innovation, Stuart Turner pumps are engineered for reliability and power.

Calpeda

Calpeda specializes in engineering products for manufacturing and industrial pumping needs, offering heavy-duty solutions for regular demands that other pumps may not meet.

Lowara

Specializing in heavy-duty applications, Lowara boasts one of the best selections of submersible pumps available that can manage viscous and dirty water, priced competitively.

KSB

A leading producer of pump technology, KSB manufactures both heavy-duty and light-duty submersible pumps, delivering excellent quality at reasonable prices.

Top Five Submersible Pumps

Submersible pumps cater to various applications in commercial, industrial, and residential settings. Whether for sewage treatment, oil extraction, or floodwater removal, submersible pumps meet diverse pumping needs effectively. To simplify your search, here are five top-rated submersible pumps for different applications.

Grundfos Unilift KP 350-AV-1 Drainage Pump

This model is ideal for applications like cellar drainage and dewatering pools or storage tanks. Crafted from high-quality materials, the pump is equipped with a long-lasting stainless steel design and automated safety cut-off to prevent overheating. A strainer at the base keeps debris from clogging the pump, making it suitable for dirty water applications.

Check prices for the Grundfos Unilift KP 350-AV-1 Drainage Pump here.

Stuart Turner Supervort Drainage Pump

This economical choice is well-suited for general, low-intensity uses like rainwater harvesting and pond management. The pump’s automatic control system ensures efficiency in operation, although it’s not designed for sewage handling.

Check prices for the Stuart Turner Supervort Drainage Pump here.

Calpeda GXC/GXV Sewage Submersible Pumps

For handling sewage and dirty water, consider the Calpeda GXCm system. It efficiently manages liquids with solids up to 35mm in diameter, featuring smooth stainless steel surfaces for easy cleaning.

Check prices for the Calpeda GXC Sewage Submersible Pumps here.

Wilo-Drain Emergency Pumping Kit

One common use for these pumps is draining floodwater. The Wilo-Drain TMW water-cooled 240v drainage pump, included in this emergency kit, comes with a 10-meter hose, making it invaluable during flooding events. The kit is affordable and an essential emergency tool for flood-prone areas.

Check prices for the Wilo Drain Emergency Pumping Kit here.

Calpeda GEO230 Pump Lifting Station

The Calpeda GEO230 lifting station offers a robust 230-liter tank solution, suitable for the Calpeda GXVM/GQSM range of drainage pumps. Constructed with stainless steel for longevity, it's effective for clean and wastewater applications, boasting a maximum flow rate of 36m3 per hour.

Check prices for the Calpeda GEO230 Pump Lifting Station here.

Guidelines for Choosing the Right Submersible Pump

Finding a replacement submersible pump may seem daunting, but by following these tips, you can simplify the process.

Inspect the Old Pump

When replacing a broken pump, inspect the old installation. It should have a label detailing its specifications, aiding in identifying the necessary type when shopping online. Also, note the diameter of the discharge pipe; the new pump must match this size and shape.

Selecting the Right Float Switch

One common pitfall is purchasing the incorrect float switch. There are two main types: a vertical switch (activates by moving straight up, ideal for smaller pumps) and a tethered switch (activates at an angle, used for larger pumps).

Consider a Battery Backup System

For protection against flooding, consider a submersible pump with a backup battery system. This feature ensures the pump remains operational even if power supply is interrupted.

Assess the Pumping Distance

Different shapes and sizes of submersible pumps cater to various pumping distances. A powerful pump may be necessary for longer distances to maintain adequate flow rates.

Factor in Liquid Viscosity

The thickness of the liquid being pumped is crucial. Low viscosity liquids can be managed with a less powerful pump, while thicker fluids, like sludge, necessitate a more powerful option.

Final Considerations When Purchasing a Submersible Pump

Before finalizing your pump purchase, review these basic dos and don’ts that will help maintain the operational integrity of your pump:

DO:

• Ensure the pump isn’t damaged before use, especially if it's second-hand.
• Connect the pump to a suitable power source that is safe from flooding.
• Document pump specifications for future reference if the pump needs to be replaced.
• Check the float switch is free to move without obstruction.
• Regularly clean the pump filter to ensure optimal function.

DON'T:

• Lower the pump using the power cable to avoid damaging it.
• Allow water to freeze around the pump as it can cause internal damage.
• Leave the top of the sump exposed or uncovered, compromising its seal.
• Allow the pump to run dry since it may lead to severe damage.

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