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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.
Equipping your system with a swimming pool booster pump may be a good idea. 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 key law of hydraulics: for a certain flow, lower pressure will be produced by a larger-section pipe in comparison to a smaller-section.

Discharge height

In expressing discharge height, CMW is the unit used. It’s a crucial criterion because you need to be sure about the pumped water getting to the target discharge point. Surface pump manufacturing companies often report a discharge height (the difference in level between pump and discharge point) or a TMH (the total manometric height expressed in metres).


Flow is any water system’s key technical characteristic! The flow rate is the amount of water that is pumped per period of time.

When buying a pump, however, note that flow rate will depend on suction depth and the discharge height. For a specific diameter of pump pipe, less flow will be produced by the same pump and the height difference will be greater too.

On the other hand, the shorter the height between your suction and discharge points , the greater the flow rate. 250m3/h for each additional user. 5m3/h for 800m?.

What is considered ‘comfortable’ domestic water pressure is around 2 to 3 B, depending on the distance to the water tower or reservoir. Therefore, properties with the most remote, “end of the line” locations can suffer from low pressure and benefit from using a booster.

If you suck water from a well, be aware of the suction depth along with the type of water you’re pulling up. Pay attention to discharge height too i.e. the height of the surface pump relative to where the water is distributed – for example, if you plan to water a garden that lies high above the well. Those who use an automatic watering system should take time to determine their required flow. Of course, more watering points mean more water required.

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