Circulation Pump Selection Guide

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What Is a Circulation Pump?

A circulation pump is a device that continuously moves water in heating or cooling systems. The impeller, driven by an electric motor, circulates water through the piping system. This allows hot water to be distributed evenly to radiators while boilers and heating systems operate more efficiently.

Where Are Circulation Pumps Used?

• Boilers and combi systems → For balanced heating.
• Apartment and central heating systems → For hot water circulation in multi-unit buildings.
• Underfloor heating systems → For balanced low-temperature heat distribution.
• Industrial facilities → For hot water and process liquid circulation.
• Cooling systems → In HVAC and chiller installations.

Circulation Pump Selection and Calculation for Apartment Buildings

To choose the correct circulation pump for apartment buildings, flow rate (Q) and head pressure (H) must be calculated.

Formula:

Q = P / (c × ΔT)

• P: Heat load (kcal/h)
• c: Specific heat coefficient of water (1 kcal/kg°C)
• ΔT: Supply-return temperature difference (usually 20°C)

Typical Values:

• Small combi boiler → 0.2 – 0.5 m³/h
• Apartment building (20 flats) → 3 – 6 m³/h
• Head pressure → 6 – 10 meters

Example:

For a 20-apartment building with a 60,000 kcal/h heat load, the required flow rate is 3 m³/h and the required head is 8 m.

Suitable models include:

• Grundfos UPS 32-80
• Wilo Yonos PICO 25/1-8
• Standart NMT PLUS 32/8-180
• DAB Evotron 25/1-70
• Lowara Ecocirc XL 25-80
• Etna CP 32-80

Circulation Pump Models by Brand

Grundfos

• UPS 25-40 → Common for combi boilers
• UPS 32-80 → Apartment systems
• Magna1 32-60 → Smart control, energy saving
• ALPHA2 25-60 → Ideal for underfloor heating

Wilo

• Star-RS 25/6 → Homes and small systems
• Yonos PICO 25/1-6 → Energy-saving model
• Stratos PICO 25/1-7 → Smart control
• Stratos MAXO 30/0.5-12 → Commercial buildings

Standart Pompa

• ECO-25/6 → Homes and combi systems
• ECO-32/8 → Apartment buildings
• NMT PLUS 25/40-130 → Efficient model
• NMT PLUS 25/60-130 → Higher capacity systems

DAB

• Evosta2 40-70 → Residential use
• Evotron 25/1-70 → Underfloor heating
• Evosta3 60/130 → Digital display, high performance

Lowara

• Ecocirc XL → Commercial HVAC
• Ecocirc XLplus → High efficiency
• Ecocirc XL N 25-60 → Stainless steel body

Etna

• CP 25-60 → Residential systems
• CP 32-80 → Apartments
• CP 40-100 → Industrial systems

Common Circulation Pump Faults and Solutions

• Pump not working → Electrical connection or motor failure.
• Pump makes noise → Air trapped in the system.
• Low water flow → Impeller may be blocked.

Frequently Asked Questions

What does a circulation pump do?

It circulates water in the system and ensures even heat distribution.

How much does a circulation pump cost?

Depends on brand, model, and capacity.

Which is the best circulation pump?

Grundfos, Wilo, Lowara, DAB, Standart Pompa, and Etna are trusted brands.

Where is a circulation pump installed?

Usually on the return line of the system.

Which circulation pump is suitable for apartment buildings?

Depends on heat load and floor count. Models like Grundfos UPS 32-80, Wilo Yonos PICO 25/1-8, or Etna CP 32-80 are suitable.

Conclusion

Circulation pumps are essential for balanced heat distribution in boilers, apartment buildings, and industrial systems. With different capacity options from Grundfos, Wilo, Standart Pompa, DAB, Lowara, and Etna, there is a solution for every need. Proper flow and head calculations should be made, and modern energy-saving models should be preferred.

When selected correctly, a circulation pump provides both energy savings and long service life.