Questions? +32 460 226 991 (English), +33 644 634 490 (French). EU-wide delivery!
Questions? +32 460 226 991 (English), +33 644 634 490 (French). EU-wide delivery!
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Circulation pumps are electronic devices that ensure the circulation of liquid in heating systems. In certain applications, circulation pumps can also be used to support the circulation of hot water, as well as cooling liquid in air conditioning systems. Circulation pumps are also used in solar or geothermal heating systems.
Electronic circulation pumps find applications not only in family homes but also in office buildings. By choosing the right combination of heat medium distribution system and the correct circulation pump, perfect functionality and high efficiency can be achieved.
The circulation pumps available in our offer can be used in both single-pipe and double-pipe applications, and they can be used in houses with underfloor heating and radiators. In such cases, the pumps are set to a constant flow rate. Subsequently, it is ideal to set a variable differential pressure on the radiators.
Variable Differential Pressure (Δp-v):
Used in two-pipe heating systems with radiators to reduce flow noise at thermostatic valves. As the flow rate in the pipe network decreases, the pump reduces the delivery head by half. When the required pumping power is reduced, electrical energy is saved. The pump changes the delivery head, i.e., the pressure, according to the open and closed radiators, resulting in energy savings.
Constant Differential Pressure (Δp-c):
The regulation maintains a constant set delivery head regardless of the pumping power. This is used in underfloor heating and all applications without variable characteristics (e.g., pumps for heating storage tanks) and in single-pipe heating systems with radiators. (It maintains pressure and changes flow according to open underfloor heating circuits = savings)
Constant Speed (I, II, III):
The pump runs unregulated at three preset fixed speed levels. Such a setting is suitable for applications with unchanging device resistance. For example, pumping tanks or radiator systems that are never closed.
To choose the right pump, it is first necessary to determine whether it will be used solely for heating or also for hot water circulation. Furthermore, it is essential to focus on the pump connection dimension, i.e., the pipe diameter and thread used, the delivery head, the method of performance regulation, and the requirement for the maximum delivery head of the pump. The delivery head for circulation pumps is stated in a closed system, which is a different calculation method than for garden pumps, where only vertical elevation is monitored. In this case, the calculation is based on the pressure losses of individual elements of the heating system.
The name of an electronic circulation pump reveals its key technical data. For example, consider the pump Grundfos ALPHA 1L 25-40 180. In this case, it is a pump from the ALPHA L series in the light version, meaning without automatic Autoadapt technology. The number 25 indicates the nominal diameter of the pump - the connection thread dimension. The value 40 specifies the product's delivery head in decimetres. In this case, it is 4 metres of height at atmospheric pressure. The last value 180 indicates the pump's construction length in mm.
All pumps we offer comply with the ErP energy directive, which has been in effect since 2013. Modern products subject to this standard, labelled ErP ready, show up to ten times lower electricity consumption compared to older solutions with fixed performance settings - nowadays typically up to 4 W. In the EU alone, around 14 million circulation pumps are sold annually, and by 2020, the introduction of the new standard should result in electricity savings of 23 billion kWh.
The change in the standard did lead to a certain price increase for new types of electronic circulation pumps, but due to significantly lower operating costs and minimal failure rates, they represent an investment with a quick return. A quality circulation pump will not let you down at the most inconvenient moment, and even a potential replacement is very simple and quick.
Due to the quality and durability of the products, we only offer circulation pumps from proven manufacturers: Grundfos is a traditional Danish manufacturer, while Wilo is a German specialist that manufactures most of its products in domestic factories. From our experience, the complaint rate for products from both manufacturers is below 1 percent of sold units.
Due to the introduction of a new generation of more environmentally friendly pumps, we are often unable to supply the same pump you have been using. However, for both of our brands, we offer quality but significantly more economical replacements:
Grundfos:
The original Grundfos UPS series is now replaced by the ALPHA 1L series or the version with autoadapt ALPHA 2.
The original Grundfos MAGNA series is now replaced by the MAGNA 1 series or the smart pump version MAGNA 3.
The original Grundfos UPE series is now replaced by the MAGNA 3 series.
Wilo
The original Wilo STAR-RS series is now replaced by the Yonos PICO or Stratos PICO series.
The original Wilo STAR-E series is now replaced by the Yonos PICO or Stratos PICO series.
The original Wilo TOP-S/E/RS/RL/D series is now replaced by the Yonos MAXO or Stratos series.
If you are looking for a replacement for an older or competing electronic pump, corresponding products currently offered can be found on the Grundfos company website.
If your electronic circulation pump has broken down, it can either be replaced or you can contact the nearest service partner.
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