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The Complete Guide to Buying a Submersible Pump

Author: Heather

Jun. 16, 2025

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The Complete Guide to Buying a Submersible Pump

  • Step 1 - Float switch detects the presence of water
  • Step 2 - Float switch operates the pump motor
  • Step 3 - Impellers draw water into the pump
  • Step 4 - Impellers force the water out of the pump and away from the home
  • Watch the video below for a full demonstration of how a submersible pump works.

    SHANGLISHI contains other products and information you need, so please check it out.

    What is a Submersible Pump Used For?

    Submersible pumps can be used in a vast and varied number of applications. It’s one of the core reasons they can seem like such complicated pieces of equipment. Saying that, for the average person, a submersible pump will be used for one of the following three applications.

    Irrigation

    From efficiently watering the garden to draining water from ponds and aquariums, the submersible pump is a key component of a thoroughly irrigated and healthy garden or piece of land. They are often implemented into rainwater harvesting systems as they can take the reliance off mains water and help people save money in the long term.

    Pumping from wells and boreholes

    The submersible pump is ideal for pumping water out of wells and boreholes. Efficient at pumping water up from great depths, the design of a submersible pump allows it to sit in tight or confined spaces and pump water without using too much power.

    Draining Unwanted Bodies Water

    A submersible pump is suitable for draining flood water and other unwanted bodies of water. Often situated in basements and other areas that experience frequent flooding, the automatic function on an electric submersible pump allows you to clear water without being present.

    The Oil Industry

    Probably not the main reason you are browsing this guide however, a submersible pump is a key tool in the process of pumping oil from ground deposits to treatment refineries.

    Can Submersible Pumps Run Continuously?

    Yes, you can run a submersible pump continuously for as long as you require if you have the suitable source of water. Saying that, it is imperative that you do not run a submersible pump dry. Running the majority of submersible pumps dry can cause significant damage to the inner motor and components. That’s why we recommend purchasing a sump pump with a float switch for automatic use.

    The Different Types of Submersible Pumps

    As mentioned at the beginning of this guide, there are many different types of submersible pumps. The two most common types are 1. Drainage submersible pumps and 2. Wastewater/sewage submersibles. Ultimately, the only difference between the two is the type of water or waste they can pump.

    Drainage Submersible Pumps

    The most common use for this type of pump is drainage. Manufacturers such as Grundfos and KSB produce this type of pump and they can be used for many different purposes. Most commonly they are used to clear excess water from cellars or basements that are prone to flooding. If you purchase this type of pump then please be aware that you need to pump the water to a safe and suitable location. You can also purchase a ‘lifting station’ which can safely discharge water away from the property and store the water in a tank.

    Wastewater/Sewage Submersibles

    When you plan to pump wastewater or sewage, you will need to consider purchasing something a little more heavy duty. The Calpeda GXCm 40b is the perfect dirty water pump. Pumps like these are suitable for applications where there are particles in the water, such as when emptying septic tanks or removing wastewater from industrial processes.

    Choosing from the Various Submersible Pump Brands

    Different brands offer a range of products capable of providing various solutions. Some are capable of tackling high viscosity liquids in short periods of time, while some submersibles are designed to be as efficient as possible over longer periods of time.

    Grundfos

    Grundfos is the largest pump brand in the UK. Offering a selection of innovative pumping technology, Grundfos is a trusted brand among engineers and offers carefully designed, well constructed pumps, albeit, at prices a little higher than their competitors.

    Stuart Turner

    Stuart Turner is an internationally recognised pump solutions provider and has an unprecedented reputation for product quality and innovation. Engineered to perfection, Stuart Turner submersibles offer power and reliability.

    Calpeda

    Offering engineering products for the manufacturing and industrial side of the pumping world, Calpeda is a pioneer in the development of heavy duty products that tackle the regular jobs other pumps can’t handle.

    Lowara

    Another heavy duty brand, Lowara have developed one of the finest submersible pump selections on the market. Capable of handling high viscosity liquid and dirty water, Lowara pumps offer a heavy duty solution at a more than reasonable price.

    KSB

    KSB is one of the leading producers of pump technology and develops submersible pumps for both heavy duty and light duty requirements. Founded in Germany, you can expect quality engineering at an affordable price.

    The Five Best Submersible Pumps

    Submersible pumps can be used in a range of applications across commercial, industrial and domestic settings. From sewage treatment to oil wells, and from draining mine shafts to removing floodwater from a cellar, a submersible pump will make short work of an array of pumping requirements. To help you navigate the complex world of submersible pumps, we’ve suggested our five best submersible pumps, each of which is suitable for a different pumping application.

    Grundfos Unilift KP 350-AV-1 Drainage Pump

    The Unilift KP 350-AV-1 is the perfect pumping solution for purposes such as cellar drainage and dewatering of pools or liquid storage tanks.

    Built to high-quality specifications with long-life stainless steel components and an automated safety cut-off switch, to prevent overheating in case of dry-running, this pump is a hardy tool that has many uses. The presence of a strainer at the base of the pump prevents fibres, particles and other debris from causing the pump to jam. This makes it perfect for dirty water applications.

    Search prices on the Grundfos Unilift KP 350-AV-1 Drainage Pump here.

    Stuart Turner Supervort Drainage Pump

    An excellent choice for general-purpose, low-intensity applications, the Supervort drainage system is best suited for rainwater harvesting or in ponds with large gravity-fed filters.

    Pump control is automated through the included adjustable float switch. They are not suitable for sewage-handling, though, making them a good budget choice for domestic consumers.

    Search prices on the Stuart Turner Supervort Drainage Pump. 

    Calpeda GXC/GXV Sewage Submersible Pumps

    For sewage and dirty water applications, the Calpeda GXCm submersible system will get the job done.

    The design means it’s suitable for use in liquid containing solids up to a huge 35mm in diameter and it incorporates smooth stainless steel surfaces for easy cleaning.

    Available for 240v or 415v outlets and with two-passage impellers or free-flow vortex impellers, their flexibility is unrivalled.

    Search prices on the Calpeda GXC Sewage Submersible Pumps here.

    Wilo-Drain Emergency Pumping Kit

    One of the most common uses of submersibles is to drain floodwater. This emergency flood kit boasts a Wilo-Drain TMW water-cooled 240v drainage pump and a 10-metre hose.

    This kit is guaranteed to make the difficult situation of a flooded house much easier to deal with. It includes additional accessories such as a cage basket for filtering debris and leaves.

    The kit has many great aspects and it is very affordable, making it a must-have pump, even simply as an emergency stand-by for households in areas with a high risk of flooding.

    Search prices on the Wilo Drain Emergency Pumping Kit here.

    Calpeda GEO230 Pump Lifting Station

    For serious pump users, the Calpeda GEO230 submersible pump lifting station provides a 230-litre capacity tank solution for use with the Calpeda GXVM/GQSM range of drainage pumps.

    The automatic collecting and lifting station is suitable for both clean and waste water, depending on the pump used. The stainless steel construction allows for a long service life and makes the device easy to clean.

    The advanced technology employed gives a maximum flow of 36m3 per hour. An added advantage of this pumping station is that it is often possible to install alternative pumps to meet specific requirements if necessary.

    Contact us to discuss your requirements of industrial submersible slurry pump. Our experienced sales team can help you identify the options that best suit your needs.

    Search Prices on the Calpeda GEO230 Pump Lifting Station here.

    How to Select the Right Submersible Pump

    Replacing a submersible pump may seem like a difficult and complicated task, but if you follow the tips below then you should be sorted in no time.

    Take a Look at the Old Pump

    If you’re replacing a broken submersible pump, then take a look over the old installation. Firstly, the old pump should have a label that details the specification of the pump. This should make it easier to decipher which pump type you need when browsing online. Another component to note down is the size diameter of the discharge pipe. Make sure to check that the pump you’re buying online is the same size and shape.

    Choosing the Right Float Switch

    A common mistake is buying the wrong type of float switch. There are two types available. They are:

    Vertical Switch Pump - this switch activates the pump by moving straight up. Often used in smaller pumps, this float can be used in smaller 10-inch diameter submersible pumps.

    Tethered Switch Pump - this switch activates the pump by moving in a diagonal direction upwards. Only available in pumps with a 14 inch (or above) intake, these floats are often used in heavy duty submersible pumps.

    Battery Backup System

    Submersible pumps are often used in an attempt to protect homes from flooding. If you do intend to leave a submersible pump running during a flood, just remember that electricity may be cut from your home at any time. If this is the case, make sure you purchase a pump with a backup battery system. A backup system simply offers peace of mind. Can you imagine how it would feel to return home after a flooding event to find that your pump ran out of power?

    Consider the Pumping Distance

    Submersible pumps will come in all different shapes and sizes. One of the key differentiators is the power capability of each pump. Consider how far you want to pump liquid. The further you want to pump the liquid, the more powerful you will want the pump to ensure flow rate.

    Consider the Viscosity of the Liquid

    In the same vein, consider the viscosity of the liquid you intend to pump. The thicker the liquid, the more difficult it will be to pump and maintain flow rate. Thin liquids like clean water will be relatively ok with a low power pump. But if you intend to pump dirty water then you will need a pump with a lot more power.

    A Few Final Dos & Don’ts of Buying a Submersible Pump

    Before buying and using a pump, take a look over these Dos and Don’ts. Most will be common sense, but a few will ensure your pump stays in full working order. On a further note, please take the time to thoroughly read the installation and operation manual provided with each pump.

    DO:

    Check the Pump isn’t Damaged Prior to Use

    If you’re buying second hand or renting a submersible pump, please take the time to ensure the pump is not damaged prior to use. Take extra time to ensure cables are not frayed.

    Connect to an Appropriate Power Supply

    If you intend to use the pump during a flood event, please make sure that you connect to an appropriate power supply. Ensure the power supply is well away from floodwater.

    Make a note of the Pump Type before Fitting in Sump

    If the pump fails while underwater, you will thank your lucky stars that you noted down the pump type and model.

    Make sure the Float Switch can Move Unrestricted

    The main cause of submersible pump failure is the pump running dry. This is often caused by a faulty float switch.

    Make sure the Pump Filter is Cleaned Regularly

    Once a month make sure you take the pump filter apart and give it good clean. This will keep your pump in full working order.

    DON’T:

    Lower the Pump Down with the Power Cable

    If the power cable frays when lowering the pump down then you are guaranteed to break the pump. Electricity and water do not mix. Take the time and care to lower the pump down and secure in place.

    Allow Water to Freeze around the Pump

    When water freezes it expands. If the water freezes inside of the pump it could damage the inner workings of the pump.

    Leave the Top of the Sump Open or Uncovered

    A submersible pump is only hermetically sealed if the whole of the pump is correctly closed and covered.

    Allow the Pump to Run Dry

    The most important thing to not do is let the pump run dry. Submersibles are designed to pump water at all times and must have a suitable water supply. Purchase a submersible with a float switch to ensure automatic cut off.

Horizontal vs Submersible Slurry Pumps: A Complete Comparison ...

Hello everyone, and welcome to today's comprehensive guide on slurry pumps. Whether you're a seasoned engineer or new to the field, understanding the differences between horizontal and submersible slurry pumps is crucial for any industrial operation. I'm David, and with over 15 years in the industry, I'll walk you through everything you need to know to make the right choice for your facility.

Before we dive deep into the specifics, let me tell you what we'll cover today. We'll explore both pump types in detail, compare their applications, discuss installation and maintenance requirements, analyze costs, and look at real-world examples where these pumps have made a significant difference.

Let's start with horizontal slurry pumps - the true workhorses of our industry. Picture a robust pump mounted on a solid baseplate, its horizontal shaft aligned perfectly with its drive system. These pumps are built to handle the toughest jobs in mining, mineral processing, and power generation. What makes them special? Well, it's their heavy-duty construction and clever design features. The large impeller handles solid particles with ease, while the external bearing assembly makes maintenance a breeze. You can get them in various materials - from high-chrome iron for extreme wear resistance to rubber-lined versions for corrosive applications.

Think of a horizontal slurry pump as a reliable pickup truck - it's sturdy, dependable, and can handle heavy loads day after day. In mining process circuits or mineral processing plants, these pumps keep material flowing consistently, which is crucial for maintaining production targets.

Now, let's switch gears and talk about submersible slurry pumps. These are the specialists of the pumping world. Imagine a self-contained unit that operates while completely submerged in the liquid it's pumping. Clever, right? These pumps combine the motor and pump into one compact package, with sophisticated cooling systems to keep everything running smoothly underwater. They're particularly brilliant for applications like sump drainage, dredging, and construction site dewatering.

When it comes to choosing between the two, it's not about which pump is better - it's about which pump is right for your specific needs. Let me break this down with some practical comparisons.

Think about efficiency - horizontal pumps typically win in continuous operation scenarios. They're like marathon runners, designed for the long haul. Submersible pumps might have slightly lower efficiency, but they make up for it with their incredible installation flexibility. You can literally drop them where you need them.

Speaking of installation, here's where things get interesting. Horizontal pumps need their space - they're like that colleague who needs a big desk to work effectively. You'll need a proper concrete foundation, precise alignment, and carefully supported piping. Submersible pumps, on the other hand, are more like that flexible team member who can work from anywhere. They need minimal installation space, though they do require proper guide rail systems and power cable support.

Maintenance is another crucial factor to consider. With horizontal pumps, everything is right there in front of you - easy to access, inspect, and maintain. Regular tasks like bearing lubrication or seal replacement are straightforward. Submersible pumps require a different approach. While they might need less frequent maintenance, when they do need attention, you'll usually need to pull the entire unit out of the liquid.

Let's talk money - because at the end of the day, cost is a major factor in any decision. Horizontal pumps typically have a lower unit cost but higher installation expenses. Think of it like buying a house - the purchase price is just the beginning. You need to factor in the foundation, the utilities, everything. Submersible pumps might cost more upfront, but their installation is usually simpler and less expensive.

Now, let me share some real-world examples that bring all this together. In Australia, a mining operation faced a challenge with high-volume tailings transport. They initially considered submersible pumps for their space-saving benefits but ultimately chose horizontal pumps due to the continuous high-volume requirements. The result? A 15% increase in processing efficiency.

In Germany, a major construction project needed reliable dewatering solutions. The tight space and temporary nature of the work made submersible pumps the perfect choice. They could be easily relocated as the project progressed, saving both time and money.

Finally, let's look at an industrial processing plant in Canada. They faced a unique challenge - they needed pumps that could handle both regular slurry and occasional heavy solids. Their solution? A hybrid approach, using horizontal pumps for their main process lines and submersible pumps for sumps and emergency handling. This combination provided the best of both worlds.

As we wrap up, remember this: the best pump choice depends on your specific needs. Consider your application, space constraints, maintenance capabilities, and budget. Don't just follow what others are doing - analyze your requirements and choose accordingly.

Thank you for staying with me through this comprehensive guide. If you found this information helpful, don't forget to like and subscribe for more industrial equipment insights.

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