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01 03 2023
What are Water Head and Water Pressure? |Aquasky

What are Water Head and Water Pressure? |Aquasky

Water head is a measurement method of the performance of a pump.

The Head is a height at which a pump can give the fluid. It is measured in feet or meters of the output vessel of the pump. It is fluid-independent, that is, regardless of the fluid's relative density, the pump will lift it to the same height. The greater the pump head the greater the pressure that the pump can generate. These statistics can be measured by placing a water tube on the pump's discharge section, and measuring the maximum height that the pump can supply the water.


The pump’s suction head is similar to the pump's head except it is the opposite. Being opposite, it rather measures the depth at which a pump can suck the water unlike the water head measure the height of the water can a pump push. Mathematically speaking, Total Head= Water Head=Suction Head.

For example, the pump is pumping water up to the height of 10 ft (Pump Head=10 ft) and it is sucking water from a depth of 15 ft (suction head=15 ft). Then the total head will be 25 ft.

Total Head= Water Head+ Suction Head

25ft = 10 ft + 15 ft


If the water level is higher than the pump, then the suction head is negative and the pump head will increase. This is because the water entering the pump applies additional pressure at the suction. Thus, increasing the level of the liquid in the suction tank will give rise to an increased head, and decreasing the level will give rise to a lower head.

For example, a pump is installed on a water tank that is 15 feet high than the level of the pump, and the height at which water is moved is 50 feet. The equation will be:

Total Head= Water Head+ Suction Head (pump installed 15 ft below the level of water)

35ft = 50 ft + (- 15 ft)


Suction conditions are also relevant to the pump head. If the suction level is lower, the head measured will be less, and vice versa. The pump’s motor converts electrical energy into mechanical energy, which the pump then imparts into the fluid as pressure. Raising or lowering the suction level therefore adjusts the potential pressure of the liquid. The more pressure the pump delivers, the higher the head will be.


Water Pressure is defined as the force applied which is towards the perpendicular direction to the surface of the object per unit area. In fact, the force of a fixed height liquid column over a unitary area will change with different specific gravities. Pressure is fluid dependent and is affected by gravity. Therefore, the same head will


Formula to calculate Water Pressure is

P (Water Pressure) (Pa) = ρ (Density of water) (ρ = 1000 kg/m3)

x h (Height) (meter)x g (Gravitational force) (g = 9.8 m/s2 )


Based on different water pressures, Aquasky's pressure tanks provide (PUMPLUS) general-pressure tanks and (MEGA-PLUS) high-pressure tanks. PUMPLUS tanks can withstand a maximum working pressure of 10 bar. MEGA-PLUS tanks can withstand a maximum working pressure of 16 bar. Mega-Plus provides high water pressure solutions for the high-rise building and long-distance pressure support. We work with you to determine the best option for your budget and water system. Please feel free to contact us. Email: [email protected]

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