FAQ Guide:discover all the answers about submersible pumps to your needs

There are many questions you must be asking yourself about submersible pumps considering their popularity and efficiency these days. Indeed, a submersible pump is particularly simple and versatile to use. In addition to firefighting, submersible pumps can also be used in private households and several other areas.

Through this article, we would like to answer all your questions related to submersible pumps and what you can use a submersible pump for.

Plus, we’ll show you all you need to know about how submersible pumps work.

On the other hand, if you have already decided to use submersible pumps and do not know which will best meet your needs;

we invite you to discover the submersible pumps put at your disposal by HANGGE.

To get to the topic of this article in an ideal way, let’s first find out what a submersible pump is.


1.Submersible pumps: what are they?

Submersible pumps, also often known as “submersible pressure pumps”, are specially designed to move water from great depths.

For submersible pumps that convey clean or dirty water, the maximum possible delivery head is 10 meters.

This value could be too low for deeper water.

Submersible pumps of this type are used to transport sewage, seepage or rainwater.

They are also used for irrigation from wells or cisterns.

They are often used to operate sprinklers and for automatic water supply.

So, for the acquisition of submersible pumps, you need to compare different submersible pumps with one another based on important criteria such as construction material, dimensions, motor, discharge capacity and discharge head.

However, if you don’t know how to do this, just follow this quiz guide.

2.How do Submersible pumps work?

With a submersible pump, larger amounts of liquid can be conveyed.

An essential feature is that a submersible pump is immersed in the liquid to be pumped.

Submersible pumps are either stationary or transportable and can usually pump out liquids very quickly.

Submersible pumps are mostly driven electrically. But there are also hydraulically driven models.

The delivery rate of submersible pumps is in the range of approx. 100 – 22,000 l / min.

Submersible pumps can either be controlled directly or have a float switch.

The latter allows the pump to only run when a certain water level is reached.

This also prevents the pump from running when there is too little or no fluid.

Dry running of a submersible pump costs unnecessary energy use and can damage the pump’s motor.

A classic submersible pump consists of a pump module, float switch, cable and an adapter for the hose connection.

3.Where are submersible pumps used?

There are many possible uses for submersible pumps.

Submersible pumps are used by households, fire brigades, industrial and commercial enterprises, farmers, sewage treatment plants, disaster control, water suppliers and for wastewater disposal.

Use scenarios occur when basements and courtyards are flooded after heavy rainfall, general flooding has occurred, garden ponds, biotopes, swimming pools, construction pits, water reservoirs, containers and large canals have to be pumped out or drained.

4.What different submersible pumps are there?

There are mostly different models, which are specialized for different purposes. The main ones are listed below :

  • Domestic waterworks to supply the house and yard with water
  • Well pump to raise spring water from a well
  • Rain barrel pump to empty water tanks
  • Special pump to transport liquid fuels such as gasoline, diesel and heating oil
  • Garden pump for irrigation
  • Fountain pump for the garden pond
  • Drainage pumps for floods and high water
  • Submersible clear water pump for clean water

5.What should you consider when purchasing submersible pumps?

Submersible pumps are available in many designs and models.

Most models work electrically and are very suitable for pumping water and other liquids around and out.

But which pump should it be and which technical information should you pay attention to when buying?

When purchasing submersible pumps, there are details you need to consider to make the right choice for your needs.

Here are among other details, the most important :

1. For what purpose would you like to use submersible pumps?

In advance, you should clarify what exactly is to be pumped: only normal water or also dirty water.

The conveying capacity and the basket size must also be corresponding.

Clearwater pumps are ideal for the home pool, vacuuming the cellar or the garden pond – provided that they are not too dirty.

They work excellently with domestic waterworks to draw valuable drinking water from rain barrels, cisterns or wells.

With these devices, a flat suction is particularly important – so that ideally you only have to wipe up a few remaining pools afterwards.

If you want to check the water level or humidity automatically, then reliable float switch drainage pumps will help.

Where clear water submersible pumps fit, dirty water submersible pumps are only just beginning their work.

With grain sizes of up to 35 millimetres, they can also cope with thicker lumps of sludge and grains of dirt (e.g. in construction holes, in the event of floods or septic tanks).

Also, things such as a high flow rate, robust housing and a durable impeller are of course essential.

2. What is the immersion depth of the submersible pump?

With a submersible pump, the immersion depth is measured from the surface of the water to the top of the pump.

Clearwater pumps naturally have a shallower depth than submersible dirty water pumps.

We recommend values ​​between 5 and 7 meters depending on the area of ​​application.

3. What is the delivery head and the flow?

One of the most important criteria when buying a submersible pump is the delivery head and delivery rate.

Most manufacturers specify the maximum values ​​for their products, and it is important to determine the approximate delivery head.

The pressure output of a submersible pump is always given in “bar”.

The specified maximum amount of conveyance thus represents the pressure output.

At a given conveyance height of 10 meters, the device has an output of 1 bar.

At a delivery height of 50 meters, a pressure of 5 bar is available.

4. What is the quality of the material?

In addition to the performance, the material of the submersible pump also plays a major role.

Many simple devices have plastic housing here.

However, we find stainless steel more recommendable (especially for heavily used dirty water pumps), as this guarantees a long service life.

A ceramic sliding seal is also worthwhile because it prevents water from getting inside the pump.

The impeller should also be of high quality for long-term use.

5. What is the Diameter/connections of the pipe?

It is also important to ensure that the hose diameter is suitable – especially with regard to its length.

If this is too small, this will harm the performance of the pump.

We, therefore, advise against using small diameters for the hose.

It is best to read the manufacturer’s instructions to get the right hose for connecting your submersible pump and its delivery pressure.


Fortunately, many of our test devices already come with a universal connection for different hose sizes.

However, you should always get an idea of ​​which connections are supported before buying.

6. Does the submersible pump accept a float switch?

Most devices come with a so-called “float switch” as standard (external or integrated).

If the water level drops and the existing float falls, the device switches off automatically.

This ensures that the pump is protected against overheating and does not run dry.

On the other hand, it automatically switches the submersible pump on again as soon as the water level rises.

Most devices come with a float switch.

If not, we recommend the water pumps provided by HANGGE, one of the leading water pump manufacturers in China.

6.What is the difference between a jet pump and a submersible pump?

In principle, the difference between a jet pump and submersible pumps is related to the operation.

Located above the ground, normal jet pumps are unable to lift water reaching a suction height of more than 10 meters.

This is mainly due to the “cavitation effect”.

Besides, a downpipe to the foot valve is used on jet pumps.

This pipe promotes the transport of a fraction of the water leaving the pump.

So, to send the water from the well to the suction pipe, this pipe-water is used by jetting action.

In fact, this makes it possible to avoid cavitation by increasing the pressure at the suction of the pump.

The main thing to remember is that jet pumps have old technology.

Therefore, such pumps do not have any specific advantage apart from the fact that the pump and the motor are located above the ground.

On the other hand, with the advancement of technology, submersible pumps are very small and can thus access even the smallest spaces.

Also, in submersible pumps, no cavitation occurs.

In fact, in submersible pumps, the atmospheric pressure is much lower than the suction pressure.

7.Which feed head should submersible pumps have?

To choose the best submersible pump, it is essential to show the transfer head.

It tells you which height differences – measured from the water surface to the outlet point – must pass through the pump.

The calculation is very simple: the further the permeability of the pumped water must be, the more energy the pump needs.

Therefore, pay attention to the specified rated power in watts.

The maximum feed height of a pump depends largely on its power consumption in watts.

In addition, the maximum dispensing speed decreases as the dispensing head increases.

This is due to the loss of friction during transport through the water pipe.

8.How many liters of water per hour must the correct submersible pumps produce?

Looking at the manufacturer’s information, it becomes clear: one of the most important data is the maximum throughput.

This value (expressed in liters per hour) indicates the number of liters of water that your garden pump can change in one hour.

To find the right model for your needs, you need to know the dimensions you want to wear.

This is because low delivery rates are more suitable for households.

However, the larger the area, the greater the quantity delivered.

9.How to maintain and clean submersible pumps?

Generally, submersible pumps are very durable and require little maintenance.

However, these devices should also be thoroughly cleaned about once a year.

You must first disconnect the pump from the mains and remove the device from the water.

You can then open the housing with just a few screws and disassemble the pump.

You can then clean the filter and wash all hoses and parts with clean water. Do not use strong detergents or vinegar to protect the material.

10.Is the submersible pump frost resistant?

In general, we recommend that you leave your submersible pump in a pond or well during the cold season.

If the water freezes, the expansion of the housing material may damage the device.

If you want to be safe, remove the pump from the water before it freezes and stores the device in a frost-free place.

A basement, garage, or shed is recommended for this purpose.

The centrifugal pump can also be placed in a container filled with water.

This prevents individual rotating parts from sticking.

11.Can we supply the plumbing with a submersible pump?

With household plumbing, you supply your household with water that is used sparingly.

You can certainly do it.

A submersible pump is even a good way to connect to a household water supply.

The latter, for example, uses rainwater and thus supplies the household with water that is used in a sustainable manner.

The submersible pump can be used to suck water directly and without bypassing it from a tank, well or rainwater.

Using submersible pumps put at your disposal by HANGGE also reduces the noise level in your home because the pump is switched off.

Additionally, you can also use the float switch to determine when the submersible pump should stop pumping.

12.How well should my deep well pump perform?

For the performance of a deep well pump, two characteristics are decisive, which are specified by the hydraulic part of the pumps:


The maximum delivery rate

Maximum pressure or discharge head

A suitable motor is required to achieve the specified values.

It does not matter whether the motor is single-phase or three-phase, as long as the motor power (kW) and the torque (daN) correspond.


The flow rate and the working pressure decrease as the water have to be pumped.

The height to be overcome when pumping is therefore one of the important criteria in choosing the right deep well pump.

13.Can we supply the plumbing with submersible pumps?

With household plumbing, you supply your household with water that is used sparingly.

You can certainly do it.

A submersible pump is even a good way to connect to a household water supply.

The latter, for example, uses rainwater and thus supplies the household with water that is used sustainably.

Using submersible pumps put at your disposal by HANGGE also reduces the noise level in your home because the pump is switched off.

14.Which submersible pump to buy?

There are different submersible pumps that can be easily adjusted to the water/liquid to be pumped.

There are also situations that make it difficult to pump water.

Often there are solutions to this.

For example, it may be necessary to vacuum a dry room. Flat suction submersible pumps are available for this purpose.

These spaces may also be very limited.

For this purpose, internal floats have been specially designed so that the pump probably works automatically.

These pumps are also small and can therefore be placed in a swimming pool.

Other specific submersible pumps are, for example, the saltwater submersible pump.

In addition, submersible pumps are often used on farms when pumping faeces.

There are also several solutions to these situations. Faeces are corrosive substances that can affect the pump and the seals (rubber fittings).

These submersible pumps are completely protected against these substances.

15.What are the advantages of submersible pump equipment?

Since the submersible pump is constantly in cold water, its electric motor is reliably protected against overheating.

Device noise is not heard on the surface near the source or in the house.

Due to its compact size, it can also be installed in a narrow and deep hydraulic structure, not to mention a well.

The device allows you to save space in the house or on the site since it is installed in the well or inside the well.

The pump can lift water from a considerable depth (up to 40 m).

A well pump is best suited for wells or seasonal wells.

In this case, you just need to drain the water from the system to keep the winter going.

Depending on the volume and pressure of the water, an appropriate unit can be selected.

16.What are the disadvantages of submersible pumps?

Every tap in the house, even for washing your hands or filling a glass with water, starts the device.

Since the pump is designed for a number of ‘‘start and stop’’ cycles, this can lead to rapid wear and damage.

However, this does not apply to units operating with a hydraulic tank.

As the tool is installed deep in the well, the device has to be brought to the surface every time for maintenance and repair, which makes the working time harder and slower.

Also, there are situations where the pump gets stuck in the well and this can be very difficult and sometimes even impossible to achieve.

In addition, we can also sometimes note the high price of certain devices.

This is one of the main reasons you should look for companies like HANGGE ; which could offer very affordable prices for acquiring submersible pumps.

17.What should be checked when examining the pumping mechanism of submersible pumps?

In addition to contamination, the main reason for the failure of the pumping mechanism is long-term dry running.

Due to the lack of liquid, the centrifugal wheel blocks become very hot and sinter; the only repair option is to replace them.

The same goes for snails and bushes.

Stuck wheels can also spin the shaft in the mounting holes and powerful pumps can deform and even destroy it.

Screw pumps have screws and rings as consumables; they are changed every 3 to 5 years, depending on the intensity of use.

The main reasons are the natural ageing of the elements and exposure to small abrasive particles.

How to calculate the efficiency of a submersible pump?


Submersible pumps are an indispensable aid in pumping large quantities of liquid.

They are particularly in demand during floods.

In addition, thanks to their high level of reliability and ease of use, they can be kept ready for use as small auxiliaries, such as a fire extinguisher.

This protection is of interest not only to firefighters but also to individuals in order to reliably protect their home.

This article is a guide you can consider visiting whenever you need answers to your submersible pump questions.

Besides, if you have any other concerns or want to acquire submersible pumps suitable for your needs, HANGGE is one of the leading water pump manufacturers in China that will best meet your needs and much more.

Do you have any questions? Do not hesitate to let us know or contact us directly.

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