Circulation pump for heating parameters. Criteria for choosing a circulation pump

Well pumps

May 11, 2015 Alexei

The choice circulation pump is made on the basis of many parameters, some of which are decisive for a particular object.

Such a unit is very economical, since it consumes a minimum of electricity, which on average is comparable to the power of an ordinary bulb (up to 120 W).

Details about the features of the mechanism and purpose

The choice of a circulation water pump is relevant for solving the problem of organizing heating systems and hot water supply.

The main function of this unit is to induce fluid movement in the system, which is a circulation as well as a recirculation loop. Similar elements are used at any objects, whether it is a civil building or a private house.

With a small load on the system, natural circulation is sufficient, which is carried out through a physical phenomenon - convection. And the choice of a circulation water pump has to be made when the serviced area exceeds 150 sq. m. Despite the fact that this equipment is a compulsory principle of operation, nevertheless, liquid is transported through the pipeline, for the most part, thanks to the energy that is transferred to the coolant. And in the calculations only friction losses appear as water moves in the pipeline.

We watch the video, a little about the pump device and the principle of operation:

The main characteristics include the noiselessness of such nodes, their high efficiency along with low power consumption. In addition, a long period of operation is also noted, so the choice of a circulation pump for heating systems must be done as carefully as possible so as not to return to this issue for a long time.

Such a device is installed in one of the sections of the pipeline. There are various designs, but two of them should be highlighted:

The design with a "wet rotor" is the most suitable and effective for small objects, for example, for private houses. The peculiarity of this option is that the main unit - the rotor with the impeller is constantly in contact with the water that it pumps. This allows you to reduce the heating intensity of the working unit, and at the same time, the liquid acts as a kind of lubricant to the mechanism.
Option with a "dry rotor." It is possible to select a circulation pump for heating systems of this kind in the case when it is planned to service large facilities, which means that the level of productivity of devices should be much higher.

In the case of the last of these versions, the rotor is not exposed to contact with the transported liquid. The sealing of this unit is carried out by means of a so-called sliding seal, on the surfaces on both sides of which a water film forms due to pressure differences in the system and the environment.

Features of the right choice

The selection of the circulation pump should primarily be based on the dimensions of the connecting elements. In the designation, it is usually customary to indicate this value, so it will not be difficult for the user to decide which model of the device is suitable for a particular system. The second component of the right choice is the maximum pressure that the pump can create. This is necessary for the device to be able to overcome the hydraulic resistance of pipes and all connecting elements.

The selection of the circulation pump is also carried out based on the level of its performance. This parameter corresponds to the amount of coolant that will pass through the device for a certain period of time. In many ways, the performance is determined by the power of the pump, however, the length of the communications, as well as their diameter, plays a role. After all, it is known that the hydraulic resistance of pipes increases if the diameter of the communications is small. Therefore, to overcome it, a more powerful device will be required.

The selection of the circulation water pump should be based on the degree of functionality of the device. Depending on the type of heating system, an adjustable version of this technique can be installed. Its advantage is the ability to quickly adapt the device to the conditions in which it is operated, while the pump is tuned to the current level of water flow in the system. As a bonus, the design may include a thermostat, a timer or the presence of several operating modes.

Popular models of foreign and domestic brands

The selection of a circulation water pump should, as a result, provide the user with the opportunity to improve the system by increasing the rate of fluid transportation in it. That is why it is important that the parameters of the device correspond to the characteristics of the heating circuit, including the diameter of the communications. One of the productive options for domestic production - the device Dzhileks Compass 25-40.

The selection of a circulation pump for the heating system in this case gave positive results from all sides: the power of the device is not higher than 62 W, \u200b\u200bthe height of the liquid is up to 4 m, the diameter of the connecting elements is 25 mm. At the same time, the permissible water temperature sufficient to organize any heating system is 110 degrees. This performance is very inexpensive - 3,400 rubles.

A foreign analog of Grundfos UPS 25-40 (with nuts) will cost 500 rubles more. However, it has exactly the same parameters as the previous version. The only difference between them is that the second of the considered versions has the ability to work in several modes. If there is a need to purchase a circulation pump, you can determine which one is better by considering many different options.

Watch a video about the Alpha2 model:

Another performance - Grundfos ALPHA 2 25-60 worth about 8,200 rubles. The device is able to propel water up to 6 m, having half the power than its counterparts (34 W), and less weight - only 2 kg. A more affordable option is Wilo-Star-Rs 25/6 with the parameters, respectively: the diameter of the connected element is 25 mm, the pressure force is 6 m. Its cost is about 5,000 rubles.

User rating

The selection of a water circulation pump for domestic hot water is also based on how reliable the manufacturer is, which is determined for the most part by the number of users who are satisfied with the purchase and operation. One of the best from this point of view are devices of the Wilo and Grundfos brands. Moreover, it is in such a sequence, since the first of these options is more popular due to very affordable prices for products, which does not affect quality at all.

Maintenance of such devices does not require much effort. Efficiency, reliable functioning and a long service life - all this allowed Wilo brand products to get to the first positions among the most popular.

To reduce the risk of clogging, some users additionally install filter elements, which further enhances the level of reliability, which is already very high, given that it is a German manufacturer.

The only feature when using pumps of this brand is that when servicing small objects, they are not necessary. But for large areas, these devices are the best option.

Thus, when choosing, the main task is to determine what force the pressure created by the device should be. Against the background of this parameter, a variant of a suitable performance level is selected in order to be able to serve a specific area of \u200b\u200bthe object. Another important factor is the diameter of the connecting elements. With the wrong sizes, the pump connection will in principle be very problematic to arrange. Having decided on the main parameters, the user needs to study in detail the reviews of those who have already encountered similar equipment in practice, and can evaluate the positive and negative sides after a certain period of operation.

Surface pumps are designed to pump water from wells, boreholes and any water bodies to a site or to a house. General principle the work is this: the pump is installed on land, and the hose is immersed in water. When choosing a surface pump, you should pay attention to the following characteristics:

The power that determines the performance of the pump. The higher this indicator, the greater the expense per unit of time the device can provide. It is necessary to calculate the approximate consumption and, based on this, choose a pump of suitable capacity so as not to overpay.
The suction depth and the lifting height, which determine how deep the hose can be immersed and at what maximum distance from the source water can be transmitted.

unique templates and modules for dle

Top Conventional Surface Pumps

The installation of conventional surface pumps is carried out outside the source, connecting the apparatus with it through a conventional hose. In the case of year-round use of the pump, it is required to provide for protection of the housing from low temperatures, since water frozen inside the working cavity can lead to breakage. Typically, the capacity of a household surface pump is designed to pump water from a depth of 10 meters. The advantages of such devices are simple installation, primitive design and high mobility.

3 JILEX Jumbo 60/35 NC

It works at 1 ° C
Country Russia
Average price: 6 649 rub.
Rating (2017): 4.0

The universal pump JILEX Jumbo 60/35 HK closes the top three of the best conventional surface pumps. This is the best model in terms of price, performance and quality. With a power of 600 watts, the device provides a performance of 3.6 cubic meters. m / h, allowing you to use the pump as the main one to provide the house or plot with water. Among the competitors in the rating creates a maximum pressure of 35 meters, which can be adjusted. It has a built-in ejector, which greatly simplifies installation.

The strengths of this model, buyers include the presence of all the automation in the kit, the lack of a built-in check valve and a standard pressure gauge. A distinctive feature of the device is the ability to work with water, the temperature of which is only 1 ° C, which allows the device to be operated in extreme conditions. Among the minuses are noisy work and a plastic outlet to the hose, with which you need to be careful not to damage it.

2 Wilo PB-088EA

Best price. Popular model
Country: Germany
Average price: 4 108 rub.
Rating (2017): 4.0

Budget model Wilo PB-088EA is in second place in the ranking of the best conventional surface pumps. Despite the low cost, the device works well and does not cause complaints. The pump has a small power - only 140 watts, but it is enough to create a head up to 9 meters and provide a performance of 2.4 cc. m / hour. The peculiarity of this model is working only with clean water, but its temperature can reach 60 degrees. Thanks to the outlet ”, all standard hoses are connected.

Buyers highlight ease of use, low cost and easy installation as the strengths of the model. The successful design of the working area allows you to use the pump for pumping water with a temperature of 2 ° C. The device is equipped with overheat protection, and will automatically turn off if overload occurs. The disadvantages of this device are the unsuccessful design of the pump mount and the noisy work. In general, at such a cost, a worthy model for their tasks.

1 Grundfos MQ 3-35

Top specs
Country: Denmark
Average price: 20 180 rub.
Rating (2017): 4.5

The ranking of the best conventional surface pumps is led by the Grundfos MQ 3-35. A powerful (850 W) device provides a throughput of 3.9 cubic meters. m / h, which allows uninterrupted supply of water to the whole house. To increase the pressure in pipelines, a function of increasing pressure is provided. The maximum immersion depth of the hose is 8 meters, so that the pump can be operated to pump water from wells and deep wells.

Among the advantages of this model, customers note high reliability, unpretentiousness to external conditions and quiet operation. The maximum temperature of the water with which the pump can operate is 35 degrees. The dry run protection provided will save the pump in the event of an unexpected water failure. Convenient electronic shutdown allows you to quickly suspend the device. The disadvantages include overpriced and unstable operation after prolonged downtime.

Video review

The best circulation pumps for heating

Circulation pumps for heating are used for forced circulation of water in a circle. Devices can work with hot water, since the main area of \u200b\u200btheir application is heating systems. Devices create pressure drops that help liquids overcome the resistance created in the pipe. When choosing a circulation pump, you should pay attention to the pressure created, which determines how large the system can handle the device, performance and the maximum temperature of the water with which the device is able to work.

Grundfos is the leader in sales of circulating surface pumps. . Grundfos - Danish concern, the most popular and reputable company for the production of pumping units. The volume of production is more than 16 million products per year. The main office of the company is in Denmark, and the main production facilities are located in Germany. Therefore, Grundfos pumps are often called German, as evidenced by the high build quality. In 2005, the Grundfos pump manufacturing plant was opened in Russia (Moscow Region).

3 Wilo Star-RS 25/4

Silent work
Country: Germany
Average price: 5 100 rub.
Rating (2017): 4.5

In third place in the ranking of the best circulation pumps for heating is the Wilo Star-RS 25/4 model. Thanks to the power of 68 W, it creates a pressure of 4 meters and provides a capacity of 3 cubic meters. m / h, which is enough for heating a small house. The pump is demanding on the quality of water and works only with a clean coolant. But he is able to pump water with a temperature of 10 to 110 degrees.

Among the strengths of this model, customers distinguish quiet operation, high reliability and good power. In addition to this, all the necessary fasteners are supplied with the pump, which greatly simplifies its installation. The disadvantages include the ill-conceived control system of the device, for example, the lack of a switch on the case.

2 GILEX Compass 25-40

Best price
Country Russia
Average price: 2 669 rub.
Rating (2017): 4.5

The second place in the rating of the best circulation pumps for heating is occupied by GIELEX Compass 25-40. This model with a power of only 65 watts is able to provide performance up to 3 cubic meters. m / h, which is comparable with many TOP models. The maximum pressure created is 4 meters - this is enough to work with most heating systems. The pump operates in a wide temperature range - from 10 to 110 degrees, which significantly increases its service life.

The advantages of this device, users include small dimensions, the presence in the kit of the necessary fasteners and build quality. The pump nozzle has a diameter of 1 ”, which makes the unit perfectly suitable for most pipelines. Among the shortcomings, the absence of a cable is highlighted (it is necessary to separately purchase it and independently connect it to the pump).

1 Grundfos UPA 15-90

The most popular circulation pump for heating
Country: Denmark
Average price: 5 754 rub.
Rating (2017): 4.0

The Grundfos UPA 15-90 model is in the lead in the ranking of the best circulation pumps for heating. This is the most popular device on the market, as evidenced by a large number of positive reviews. With a relatively small size, the device boasts a power of 118 watts, which is significantly superior to competitors. If necessary, there is the possibility of increasing pressure using a special regulator. The throughput is low - only 1.5 cubic meters. m / h, but it is enough for heating any apartment.

The advantages of this model according to customers - high reliability, quiet operation and ease of installation. In addition, the pump is equipped with dry running protection, which will automatically turn it off when there is no water supply. The device operates in the temperature range from 2 to 60 degrees. The disadvantage is inconvenient manual control. In terms of parameters, this is the best circulation pump for heating.

The best sewer installations

Sewer installations are used to collect and dispose of wastewater. The devices have a sealed enclosure and small dimensions. They are used in cases where it is not possible to divert waste water by gravity. The main advantage of the plants is the lack of maintenance. The device cleans itself after emptying, which eliminates the penetration of unpleasant odors into the living room

2 Grundfos Sololift 2 C-3

High throughput
Country: Denmark
Average price: 21 963 rub.
Rating (2017): 4.0

In second place in the ranking of the best sewer installations is the Grundfos Sololift 2 C-3 model. Despite the high price, many buyers liked it for its reliability and performance. With a power of 640 W, it provides a throughput of 14.4 cubic meters. m / hour and creates a pressure of 8.5 meters. Sewer installation combines up to 7 water intake points, which allows you to connect several sources of polluted water.

Among the strengths of this installation, customers distinguish good equipment, high speed and quality of components. The device has a small size and weight of 6.6 kg, which allows you to install it almost everywhere. The disadvantages of this model are the need for regular cleaning of the float for the correct operation of the pump and quite noisy work.

1 SFA SANIVITE Silence

Best price
Country: France
Average price: 22 300 rub.
Rating (2017): 4.5

The first place in the ranking of the best sewer installations is held by SFA SANIVITE Silence. With the dimensions of the drain tank and power of 400 watts, the device provides a capacity of 6 cubic meters. m / h, which is enough to service a small house. The model works with dirty water and is unpretentious to the type of runoff. The maximum temperature with which the installation works is 60 degrees.

The advantages of the device buyers include quiet operation, high reliability and small size. In addition, a non-return valve prevents odors from entering the room. In the event of overheating or lack of wastewater inside the unit, the unit will shut itself down. Among the minuses, only an overvalued price is noted.

How to improve the efficiency of the heating system? There are many ways to do this: from choosing the material for making pipes and radiators, to increasing the capacity of the boiler. The main indicator of the efficiency of the system is the difference in water temperatures at the inlet and outlet manifold of the boiler (Δt). By decreasing this value, the amount of energy for heating water in the system is reduced. One of the implementation methods is to increase the flow rate of the coolant through the pipes. To do this, install circulation pumps, the choice of which will be discussed.

The circulation pump is designed for forced movement of water through the heating system. The figure below shows a typical pump design:

The operation of this device is based on the use of centrifugal force. The design provides a wheel with curved blades, which is mounted on the shaft of the electric motor. Water falling on rotating elements increases its speed. After passing the wheel, the coolant enters the diffuser, where the kinetic energy is converted into potential energy. This is necessary to increase static pressure.

Pump types

Structurally, circulation pumps are divided into 2 types:

“Wet.” The motor rotor is washed by the pumped liquid. These models are characterized by low price and relatively small capacities. Are established for systems of individual heating in private houses.
"Dry." The rotor is protected from water by a special membrane. These pumps have high power and are used for systems with large volumes of coolant.

Before you buy a circulation pump, you must select its model. To do this, you should know its main technical parameters and selection criteria.

Specifications and power calculation

All pumps use a uniform labeling system. It indicates the following parameters:

Connecting diameter For domestic use, mechanisms with pipe sizes of 25 and 32 mm are used.
Power. In this case, indicate the maximum height of water rise - dm (from 40 to 60). The optimal pressure for an individual system is from 0.5 to 2.7 m³ / h.

The water pressure generated by the pump is necessary to overcome the hydraulic resistance in the pipes. On average, 0.6 m of the pressure head of the pump is required per 10 m long pipeline section. That is, for a heating system with a total length of 70 mp the pressure head of the pump should be 4.2 m. Consumption (productivity) is calculated by the formula:

Q is the flow rate of the pump.
N - power of the heating boiler.
Δt is the temperature difference at the inlet and outlet of the boiler.

Experimentally, the optimal parameters of the pumps were installed for installation in a room with different quadrature. These characteristics are shown in the table:

Area, m²	Delivery in the heating system, m³ / hour	Pump brand
80-240	0,5-2,5	25-40
100-260	0,5-2,5	32-40
150-280	0,5-2,7	25-60
160-300	0,5-2,7	32-60

After calculating the pump parameters, it is necessary to analyze the manufacturers market.

Manufacturers Overview

Currently, a number of European companies are engaged in the production of circulation pumps, whose products are characterized by high quality, big term of operation and convenient installation.

Wilo

Products of the German concern "Wilo SE" have long been known to Russian consumers. The company is engaged in the production of pumping equipment for various heating, ventilation and sanitation systems. For autonomous heating from the company's assortment, you can choose the optimal model, for example Wilo-Stratos ECO.

Specifications:

The maximum expense - 2,5 m ³ / hour
Head - 4.9 m
Rated Power - 59 W

This model implements automatic and manual modes of operation. Possible settings for the rotor speed, differential pressure, release function.

Dab

The Italian company "DAB" has been specializing in the production of more than 40 years centrifugal pumps, both for private use, and for large industrial facilities. Among the products, it is worth highlighting the wet rotor pump model: EVOTRON 40/130.

A feature of this model is a convenient digital display that allows you to control the operating modes of the device. Specifications:

The maximum expense - 2,7 m ³ / hour
Head - 4 m
Rated Power - 27 W
Inner diameter for connection - 25

In addition to the above manufacturers, in the Russian market of pumping equipment, the products of Pedrollo, Gruvdfos are also in demand.

When choosing a pump, the reputation of the manufacturer (the quality of its products) must be taken into account. In most cases, this can be done by analyzing customer reviews. They will help to make an objective picture.

Circulation pumps allow to get rid of the problems arising in systems with natural coolant circulation. In thermal systems with a circulation pump, good circulation of the coolant in heating devices is provided, the boiler can be located in an arbitrary place, as well as the use of pipes of a smaller diameter than in systems with natural circulation.

The choice of a circulation pump is a task to be solved when designing a system with forced circulation. What are the parameters for choosing a circulation pump for the heating system? Which brand pump to choose . We will try to answer these questions in today's article.

First of all, the circulation pump must be designed for heating systems, that is, it must withstand high (up to 110 degrees C) temperatures, and work on water or other coolants used in heating systems.

In order to correctly select the technical parameters of the pump use it characterization - A special graph reflecting the change in pressure and flow. This chart is plotted hydraulic characteristic of the systemdetermined by its hydraulic resistance. The intersection of these graphs will determine the operating point, which will indicate what flow rate and pressure the pump will provide in this system.

However, manufacturers do not always publish the characteristics of the pumps in the form of graphs, but give only the nominal and maximum operating parameters. In addition, it may be difficult to determine the hydraulic characteristics of the system. For these reasons pump selection is often carried out according to the value of the nominal flow rate and maximum pressure.

How to determine the required flow of the circulation pump in the heating system

Delivery (productivity) of the pump - the amount of fluid transferred through its outlet pipe per unit of time. You can estimate the required pump flow using the dependence:

If you want to roughly determine the required pump flow, then you can use the rule: in one hour, the pump must pump a volume equal to three volumes of the entire heating system. You should choose a pump that provides a margin of 10-20% in performance.

How to determine the required pressure of the circulation pump

Centrifugal Pump Head most often expressed in meters. The pressure value allows you to determine what hydraulic resistance it can overcome. In a closed heating system, the pressure does not depend on its height, but is determined by hydraulic resistance. To determine the required pressure, it is necessary to perform a hydraulic calculation of the system. In private homes when using standard pipelines, as a rule, a pump developing a pressure of up to 6 meters is usually enough.

Do not be afraid that the selected pump is able to develop a larger head than you need, because the developed head is determined by the resistance of the system, and not by the number indicated in the passport. If the maximum pressure of the pump is not enough to pump fluid through the entire system, there will be no fluid circulation, so you should choose a pump with a pressure head.

What do the numbers in the designation of the circulation pump mean

Usually, the name of the circulation pump is followed by numbers, for example Compass 25-60. The first digit indicates the rounded diameter of the nozzles, and the second - the pressure in decimeters.

Pump brand

If you have decided on the characteristics, then you only need to choose the brand of circulation pump. We offer some of the most famous brands.

Gileks Compasses

Company JILEX - a well-known manufacturer of centrifugal, vortex, submersible pumps and pumping equipment. The company’s production is located in Russia in Klimovsk, Moscow Region. The advantage of Jilex pumps is good quality and reasonable prices.

The figures below show tables with the most important characteristics of the compass pumps. On pumps of this brand a switch is installed, which allows to obtain various characteristics.

Pumps Dzhileks Circular 25-40, 25-60, 25-80

Pump with union nuts 1 in. Pump head 4m, 6m and 8m respectively.

Grundfos circulation pulsers (Grundfos)

Grundfos is a Danish pump company known throughout the world. Grundfos pumps are somewhat more expensive than some analogues, however, buying a Grundfos pump you can have no doubt about the quality and reliability of the unit.

Grundfos UPS 25-40, 25-60, 25-80

Grundfos pumps are small-sized, low-noise and economical.

What are circulation pumps for?

Circulation pumps are installed in heating systems with forced circulation of the coolant. Actually, the pumps provide this circulation. In systems with forced circulation, pipes of smaller diameter can be used than in systems with natural circulation, which save money on when installing the heating system. In addition, with forced circulation of the coolant in the system, it is possible to install devices for controlling the temperature in the room.

How to buy a circulation pump for heating

For, to purchase the pump you are interested in, click on its image, you will be redirected to the Cotmarket online store, where you will need to register and make a purchase. Payment can be made by credit card or e-wallet, you can also pay for goods upon receipt or arrange a loan. Delivery is carried out at points of delivery located in many cities of Russia, in addition, delivery is carried out by mail or courier.

If we talk about modern heating systems for cottages or small houses, first of all, probably, it is necessary to note a heating boiler, which takes on the functions of heating the coolant, water to a certain temperature, produces heat for heating, etc. But, obviously, this is absolutely not enough to feel comfort in the house, because you need to somehow distribute this heated coolant through pipes, heat exchangers, radiators so as to achieve a constant required temperature. Here the so-called “heart” of the heating system comes to the rescue - low power heating pumps.

The principle of operation of such pumps is approximately the following: through a pump hot water from the boiler moves through the steps of the pipelines in the house (one or more), through radiators, heat convectors or other heating appliances, then it returns through the pipeline to the boiler. When the water temperature drops to a predetermined certain level, the heating boiler is re-activated, and the process is completely repeated.

In fact, water in such a closed system moves in a circle, while the pump only overcomes friction. This explains the low power of the circulation pumps used in domestic heating systems. The power consumption of these pumps is very low, approximately, like a conventional bulb, 100 watts.

Modern circulation pumps of well-known companies such as German Grundfos or Wilo, which are often used in domestic heating systems, are equipped with three power levels. Manual three-stage speed switches allow you to control the system even without the use of additional automation. If the house has become hot, and the pump continues to operate at full strength, it is enough to reduce the pump power, as the flow of coolant in the system will also decrease, and the temperature will decrease on heating devices.

It is also possible to connect the pump to the power line through a thermostat (temperature sensor). Then the pump will depend on the temperature in the rooms, it will turn on automatically only when the temperature in the house drops below the desired one. Despite its low power, pumps of this category can provide heat to rooms with an area of \u200b\u200b200 to 750 square meters. m

Grundfos today also offers circulation pumps with integrated electronic control (Grundfos Alpha or Grundfos UPE). They are capable, depending on the needs of the system, change the frequency of rotation of the electric motor. Pumps of this generation save about 60% of electricity and reduce hydraulic noise in pipelines.