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Comparison Aruna RM 25-4-180 4 m
1 1/2"
180 mm
vs Rudes RS 25/4-180 4 m

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Aruna RM 25-4-180 4 m 1 1/2" 180 mm
Rudes RS 25/4-180 4 m
Aruna RM 25-4-180 4 m
1 1/2"
180 mm
Rudes RS 25/4-180 4 m
Outdated ProductOutdated Product
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Main functioncentral heatingcentral heating
Designsingle headsingle head
Pump typecentrifugalcentrifugal
Rotor typewetwet
Specs
Max. flow3200 L/h2700 L/h
Max. head4 m4 m
Max. operating pressure10 bar10 bar
Minimum fluid temperature-10 °С-10 °С
Max. fluid temperature110 °С110 °С
Features
3 speeds
3 speeds
Motor
Max. power consumption70 W
70 W /50/35 W/
Mains voltage230 V230 V
Motor typeasynchronous
Shaft arrangementhorizontalhorizontal
Shaft materialcermetcermet
Connection
Connection typethreadthread
Inlet/outlet arrangementcoaxiallycoaxially
Inlet1 1/2"1 1/2"
Outlet1 1/2"1 1/2"
More specs
Pump housing materialcast ironcast iron
Impeller materialplasticplastic
Country of brand originChinaUkraine
Port-to-port length180 mm180 mm
Dimensions (HxWxD)125x180x137 mm
Weight2.2 kg
Added to E-Catalogaugust 2019june 2017

Max. flow

The maximum flow of a pump is the amount of liquid it can pump in a certain amount of time.

Features of choosing the optimal performance option depend primarily on the purpose of the pump (see above). For example, for DHW recirculation models, the pump performance should not exceed the performance of the water heater. If the water heater is capable of delivering 10 litres per minute to the DHW circuit, then the maximum pump performance will be 10*60=600 L/h. The basic formula for calculating the performance of a heating system takes into account the power of the heater and the temperature difference at the inlet and outlet, and for the cold water system — the number of points of water intake. More detailed information about the calculations for each application can be found in special sources, and it is better to entrust the calculations themselves to professionals.

Motor type

The type of electric motor provided in the design of the pump.

— Asynchronous. Engines of this type have the simplicity of design and low price, combined with reliability. Their main disadvantage is the dependence of the rotational speed on the load, which leads to the fact that it is difficult to adjust this frequency accurately for such an engine. At the same time, for domestic use, it is not critical and in the professional sphere, it rarely creates difficulties. Therefore, induction motors are very popular in modern pumps.

— Synchronous. Synchronous motors are distinguished by high accuracy in speed control — it practically does not depend on the load on the rotor; this is their main advantage over asynchronous ones. On the other hand, this type is more complex and expensive, and the need for fine adjustment is quite rare. Therefore, synchronous electric motors are mainly installed in high-end pumps designed for use in specific conditions.

Country of brand origin

In this case, the country of origin refers to the country from which the product brand originates. A brand, in turn, is a general designation by which the products of a particular company are known in the market. The country of its origin does not always coincide with the actual place of production of the product: to reduce the cost of production, many modern companies transfer it to other countries. It is quite normal for products, for example, of an American or German brand, to be made in Taiwan or Turkey. Contrary to popular belief, this in itself does not lead to a decrease in the quality of the goods — it all depends on how carefully the brand owner controls the production. And many companies, especially large and famous ones, monitor the quality very zealously — after all, their reputation depends on it.
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