How to Calculate Flow Rate and Pump Head?

The most common questions in pump and booster selection are:

• What is flow rate?
• What is pump head?
• How is flow rate calculated?
• How is pump head calculated?

If you calculate these two values correctly, your system will work efficiently and without problems.

In this guide, flow rate and pump head calculations are explained in the simplest possible way. Even without technical knowledge, you will understand how to choose the right pump after reading this article.

At Pomeka, you can find trusted brands such as DAB, Ebara, Wilo, Masdaf and Grundfos.

What is Flow Rate?

Flow rate is the amount of water a pump moves within a certain time.

• Common units: m³/h (cubic meter per hour) or L/min (liter per minute)
• Simply put: “How much water does the pump deliver in one minute?”

Example:

A pump delivering 50 liters per minute has a flow rate of:

$50L/min=3m3/h$

For homes and villas, DAB booster pumps are popular thanks to balanced flow performance.

Easy Flow Rate Diagram

Tap Opened → Water Collected for 1 Minute → Measured in Liters → Flow Rate

What is Pump Head?

Pump head is the total vertical height a pump can move water.

• Unit = meter (m)
• Includes:
  • Static height
  • Pipe losses
  • Outlet pressure requirement

Example:

If water must be delivered to 20 meters, the pump should provide at least 20 m head.

For industrial systems requiring high head, Ebara pumps are widely preferred.

How to Calculate Flow Rate?

Use these steps:

1. Count water usage points (tap, shower, sink, garden line)
2. Average use per point ≈ 10–15 L/min
3. Simultaneous use factor = 40–60%

Example:

• 5 taps + 2 showers = 7 points
• Each uses 12 L/min
• 50% simultaneous use

$(7\times 12)\times 0.5=42L/min=2.5m3/h$

Wilo booster systems are known for quiet operation in low and medium flow applications.

How to Calculate Pump Head?

Three main steps:

1. Static Height → Vertical distance from lowest to highest point
2. Pipe Losses → Add approx. 20% for elbows, valves, pipe friction
3. Required Pressure → Add approx. 20 m (2 bar)

Example:

• Well depth = 10 m
• Building height = 15 m
• Pipe losses = 5 m
• Outlet pressure = 20 m

$10+15+5+20=50m$

Total required pump head = 50 meters

Masdaf pumps are reliable choices for high-head systems.

Tips for Correct Pump Selection

• Determine required flow rate
• Calculate total head
• Compare pump catalogs
• Oversized pump = energy waste
• Undersized pump = low pressure and continuous running

Grundfos pumps are preferred for long life and high efficiency in homes and commercial systems.

Frequently Asked Questions

1. How is flow rate measured?

Use a container and measure how many liters flow in 1 minute.

2. What flow rate is suitable for a house?

Usually 3–5 m³/h is enough for houses and villas.

3. What pump is suitable for 50-meter head?

Choose a pump capable of minimum 50 m head. Ebara and Masdaf are good options.

4. Why is choosing without calculation wrong?

It causes energy waste or weak water pressure.

5. What pumps are available at Pomeka?

Pomeka offers a wide range of DAB, Ebara, Wilo, Masdaf and Grundfos products.

Conclusion

$FlowRate=WaterDemand$

$PumpHead=Height+Losses+Pressure$

When these two values are calculated correctly, choosing the right pump or booster becomes very easy.

At Pomeka, you can safely review world-famous brands such as DAB, Ebara, Wilo, Masdaf and Grundfos and choose the most suitable solution.