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Circulation Pumps

Circulation pumps are silent, efficient, and long-lasting pumps used to circulate fluid in closed-loop systems within heating and cooling applications. They deliver ideal performance in combi boiler, boiler, and chiller systems.

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What Are Circulation Pumps and Their Working Principle

Circulation pumps enable hot or cold water prepared in centers such as boilers or chillers to overcome the resistance in the pipelines and reach end-user units (radiators, fan coils, underfloor heating). Modern Circulation pumps feature a frequency converter motor structure that automatically adjusts their speed according to the system's needs. ORFA Industrial offers a wide range of Circulation pump solutions, from high-rise buildings to standalone homes. Properly selected Circulation pumps can provide up to 50% savings in heating costs while helping maintain thermal balance in the system. Therefore, Circulation pumps are considered the most critical component of HVAC projects.

Circulation Pump Types and Applications

Circulation pumps, which vary according to the system structure and fluid temperature, are divided into wet rotor and dry rotor types. The main Circulation pump models available in ORFA's stock are:

By Structural Features

  • Wet Rotor Circulation Pumps — Quiet operation, maintenance-free design.
  • Dry Rotor Circulation Pumps — Power for high flow rate and large systems.
  • Frequency Converter Circulation Pumps — Smart energy management.
  • Twin Circulation Pumps — Redundant operation and safe operation.

By Application Fields

  • Central heating and underfloor heating systems.
  • Solar hot water Circulation pumps.
  • Air conditioning and chiller cooling cycles.
  • Domestic hot water recirculation lines.

Selecting Efficient Circulation Pumps

To reduce operating costs, the most suitable Circulation pumps should be determined by calculating the system's resistance (head) and required water flow rate. The ORFA technical team calculates the most appropriate Circulation pump configuration for your project with high engineering standards. Poorly selected or under-capacity Circulation pumps cause noise and inefficient heating in the system. With high-tech Circulation pumps, system life is extended while comfort levels are increased.

Technical Parameters

  • Flow Rate (Q): Amount of water circulated per hour.
  • Head (Hm): Ability to overcome system resistance.
  • Connection Type: Threaded or flanged Circulation pumps.
  • Operating Pressure: PN6, PN10, or PN16 rating.

Advantages

  • Low carbon emissions compliant with ERP directives.
  • Error feedback and digital display control.
  • Easy installation and compact body design.
  • Extensive spare parts and service network support.

Frequently Asked Questions

What is the function of frequency converter Circulation pumps?

These Circulation pumps detect the changing resistance as valves open and close in the system and save energy by reducing their speed. They also prevent whistling sounds and high pressure loads in the system.

Why do Circulation pumps make noise?

Air in the system, incorrect installation, or selecting an oversized pump can cause noise. Choosing the correct capacity Circulation pumps and using an automatic air vent resolves this issue.

What factors determine Circulation pump prices?

Circulation pump prices vary according to the motor power, head, connection diameter, and whether they have a frequency converter. Brand quality and service network coverage are also factors affecting the price.