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Factors that Determine Booster Pump Power, Flow and Pressure

A booster pump is just a pump, with a bladder tank or without, that allows you to raise domestic water pressure or maintain it in the pipes during times of heavy demand. If you have a pool, it can be good to operate at relatively high pressure, with automatic cleaners and other robots being better at eliminating encrusted dirt.
An swimming pool booster pump can be good equipment for your system. But how do you determine booster pump power, flow and pressure?


The force of water at the discharge point is known as pressure, depending on pump pipe cross-section, and expressed in B (bars). Manufacturers may also indicate pressure in CMW (column metres of water).

Pressure follows flow around. This is a fundamental law of hydraulics: for a particular flow, a bigger-section pipe will produce less pressure compared to a smaller-section.

Discharge height

Discharge height is indicated in CMW. It’s a critical criterion as you must ensure that the pumped water actually reaches the target discharge point. Manufacturers of surface pumps typically report either a discharge height, which is the level difference between pump and discharge point, or a TMH, which is the total manometric height indicated in metres.


The central technical property of water systems is none other than flow. Flow rate is the amount of water pumped per span of time.

When choosing a pump, keep in mind though that flow rate will vary on the basis of suction depth and the discharge height. For a certain diameter of pump pipe, the same pump will bring less flow as the difference in height increases.

Conversely, the smaller the distance between your suction and discharge points in height, the greater the flow rate will be. 250m3/h for each additional user. If the purpose is watering a garden, have 1m3/h for 400m? and 3.

Domestic water pressure that is considered “comfortable” is anywhere from 2 to 3 B, depending on distance from the water tower or reservoir. Hence, the most remote, “end of the line” properties may experience low pressure and find a booster helpful.

If you get water from a well, look at the suction depth as well as the type of water you’re sucking up. Also consider the discharge height i.e. the surface pump’s height from where the water will be distributed – for instance, if you want to water a garden that sits high above the well. If you use an automatic watering system, make it a point to work out your required flow. Obviously, you will need more water the more watering points you have.

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