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Sump Motors Purchasing Guidelines

Sump Motors purchasing guidelines

There are two types of domestic water motors are available.

  1. Monobloc Pumps\Motors work from outside of the water
  2. Submersible motors

Monobloc Pumps\Non-Submersible Motors:

These motors will be outside of the water. These are the air cooled machines.

Motors will come with foot valve and without foot valve. Motors without foot valve are called self-priming motors. Self-priming motors are easy to operate and you need to fill a glass of water inside the motor for the first time. Look for the instruction manual for more details.

If you watch the unboxing Mahendra motor video then you can observe a small bolt on top of the motor. you have to  open bolt and fill the water before you switch on the motor


  • Monobloc motors are less costly than submersible motors


  • Motor running noise will be there. Sound will gradually increase over the time(years).

Submersible Motors:

These motors will be within the water. These are water cooled machines.

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  • Noiseless. Since the motor will be in the water, running noise will not be there.
  • foot valve and motor incoming pipe connections are not needed because it will be there inside water
  • Priming problems will not be there.


  • Submersible motors are costly than non-submersible motors

 While purchasing water motor you need to be clear on following items:

  1. How many floors are you building house? So that you can make a decision on the power of the motor
  2. Identify a permanent place to keep the motor
    • while starting the building this might be a premature question but eventually you need to decide where you need to keep the motor.
    • Normal domestic motor input pipe will suck the water for about 10- 15 feet (height) from underground sump. So in case if you are planning to by monobloc water motor, You need to keep water motor near sump
    • Once you decide a place then you can calculate the distance between water tank and motor out pipe
  3. Look for output rate of the motor, how many liters of water it is discharging for an hour.
  4. Are you planning to use the same motor for construction work also?
    • Yes you can use  the same motor for curing and as well as after construction also. But if water output rate is high then water will get wasted during curing process. You can user drum or container to store the water and perform curing process.

So based on the above factors you can decide how much power motor you need to purchase. For domestic use 1 HP or 0.5 HP motor will be sufficient (depends on the number of floors)

Output rate of a motor:

While purchasing motors you will see maximum capacity of the motor. It means the motor can push the water without any bends/curves. If you use bends then maximum capacity will be reduced based the number of bends you use

  • If you put a bend, 5 feet (approximate value)will be reduced from maximum capacity
  • In the flat surface, 20 feet(approximate value)is equivalent to 5 feet height.

For example, assume output rate capacity is 100 feet height, then If you are using two bends and pipe is traveling on the flat surface for 20 feet then you need to reduce 15 feet from pushing capacity

So for motor preferably use long bends instead of 90-degree bend.

Motor companies

Following are the different companies motors which you can try. but there are many more which are reliable and trustworthy

  1. Mahendra
  2. Suguna
  3. V- Guard

I personally use Mahendra  company motor.  I am satisfied with the performance of this motor. I am using it from the last one year no issues in my house.For our house, we pump around 80000 liters and we get around less than 200 rupees power bill (in Bangalore)

Additional Information:

If you want to know the basics of self-Priming motor, How it will work, watch this video. This will explain your questions and show you how motor will suck the water from the sump.

Terms of use/ Attribution: This video is licensed under a GormanRuppPumps. Original version can be found here 


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