There are plenty of electric water pumps on the market which do a perfectly good job. If you need to move water from one place to another or make it circulate, you may want to consider a submersible water pump. Thanks to being fully submerged they bring several advantages which we will explore in more depth here.

What Are Submersible Water Pumps?

Submersible water pumps, pump liquid from one place to another or circulate it. The key difference between this kind of pump and standard electric water pumps is that they are fully submerged in the liquid they are pumping.

Submersible water pumps form part of a full assembly and consist of a motor and pump. The motor is often hermetically sealed and protected from water damage which prevents the pump from short circuiting.

Advantages of a Submersible Water Pump

Due to their design, your submersible water pump is ideal for certain applications. This is because of the following:


  • Efficiency – Submersible pumps have efficiency by design. As they are already in the liquid they do not have to draw the liquid but push it. This creates a positive fluid pressure at the inlet of the pump and saves a considerable amount of energy when compared to other kinds of pumps. In addition, as the pump is submerged in liquid overheating is prevented.
  • Avoids Cavitation – A problem that is often experienced when pumping liquid is cavitation. This is where the static pressure of the liquid falls below the liquid’s vapour pressure. When this happens, small vapour filled cavities in the liquid form, causing pumping efficiency to drop. As your submersible pump is in the liquid cavitation is prevented.
  • Low Noise – Pump noise is dampened by the liquid it is submerged into. This generally reduces noise considerably.
  • No Priming Needed – Submersible water pumps do not require priming as they are already filled with the liquid they are operating in, and as such pushes the liquid as desired.

When to use Submersible Pumps

There are several common applications for submersible water pumps. They are:

  • Wastewater – Thanks to the fact they are less costly to install and maintain than other types of pumps they are often found in pump and lift stations.
  • Sewage – Often, submersible pumps are moving water from pools where it collects in pits or low-lying areas. Grinder pumps are often used in this environment to shift solid matter from pump to water inlet.
  • Dredging – Specially designed pumps are used for dredging harbours as they have to shift solid matter as well as water.

Are There Disadvantages to Using a Submersible Pump?

There are a few disadvantages to a submersible pump. They are:

  • Maintenance – Being submerged means they are harder to reach and subsequently maintain. This is compounded as the pump is more integrated into the system than its above surface level counterparts.
  • Corrosive – Over time a submersible pump may corrode. Normally they are given an epoxy resin coating to keep them functioning but this can and does degrade over time.

Nonetheless, a submersible water pump is the way to go for many applications that involve pumping water from one place to another. Especially if it is needed in hard to reach locations.

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