Comfortable living in a country house is impossible without a well-designed and properly equipped autonomous heating system for residential premises. Its mandatory components are: a boiler (electric, solid or liquid fuel), a pipeline, radiators and a circulation pump that provides forced pumping of the coolant in a closed circuit. From his choice largely depends on the efficiency and reliability of the entire system as a whole. To date, the choice of these devices is very diverse (both in terms of technical characteristics and manufacturers and prices).
Design and principle of operation
Structurally, any electric circulation pump for heating consists of a housing, a rotor, a stator and an impeller. There are two technological holes on the body of the device, to which pipes are connected using a threaded or flanged mount. When the electric motor is turned on, the impeller fixed on the rotor axis draws liquid from the inlet and pumps it into the heating pipeline system, thereby creating the necessary pressure andproviding circulation of the coolant.
Depending on the features of the model, the power cable is either initially connected to the product, or it is mounted through a special junction box (installed on the case). Built-in engine speed control (manual or automatic) allows you to choose the optimal mode of fluid circulation.
For the manufacture of cases, corrosion-resistant metals (cast iron, brass or bronze) are used. The impeller is quite often made of high-strength polymer materials.
Main producers
According to the feedback from consumers who successfully use circulation pumps for heating their cottages and country houses, the most popular (in terms of price / quality / reliability / durability) are products from manufacturers such as Danish Grundfos, German Wilo, Swiss Biral, Italian DAB and Greek Neoclima. Domestic companies do not lag behind their Western competitors and have been successfully competing with them for a long time. Moreover, the price of products of Russian manufacturers (Aquario, Dzhileks, Caliber, Belamos, Whirlwind) is lower compared to foreign counterparts. Reviews of Chinese circulation pumps for heating are very ambiguous, and often negative. Therefore, we will refrain from listing manufacturers from the Middle Kingdom, whose products are also quite widely represented on the Russian market.
Varieties
According to the design, allcirculation pumps are divided into two main types:
- Devices with a dry rotor. For such products, only the impeller is in direct contact with the coolant. With the help of special sealing rings, the rotor chamber is hermetically isolated from the pumped liquid. These devices are noisy and require regular maintenance. Therefore, having such advantages as a very high efficiency (up to 80%) and high productivity, these circulation pumps are practically not used for heating private houses. Their main area of application: autonomous heat supply systems for industrial enterprises, kindergartens, medical institutions, shopping malls, and so on.
- Units in which the rotor and impeller are immersed in a coolant (which lubricates the rubbing parts of the structure and protects them from excessive overheating), and the stator is separated from the liquid by a sealed glass. The lower efficiency (50-55%) of such circulation pumps for heating (compared to "dry" counterparts) is offset by a number of advantages: low noise level, increased reliability (due to wear-resistant and non-corrosive materials used in the manufacture), compact dimensions, ease of installation, long service life (during which there is no need for preventive maintenance) and affordable price. It is these products that are most in demand in the arrangement of heat supply systems for individual houses.
Specifications
Basictechnical characteristics of circulation pumps used in autonomous heating systems of private houses are:
- capacity – 3.5 to 12.5 m³/h;
- head - from 4 to 11 m;
- power consumption - from 0.03 to 0.3 kW;
- maximum coolant temperature - up to +110-120 degrees;
- pressure in the hydraulic system - from 6 to 10 bar;
- diameter of connection pipes - from 25 to 65 mm;
- number of engine speeds - 1, 3 or with automatic adjustment;
- installation size - from 130 to 180 mm.
General principles for labeling models
Many manufacturers adhere to certain general rules when marking models. Usually the first two digits indicate the diameter (in mm) of the pipes to be connected, the next one (in m) or two (in dm) digits indicate the head.
When purchasing a circulation pump 32-40, the consumer is initially informed that the product is intended for connection to pipes with a diameter of 32 mm and provides a pressure of 4 m (that is, 40 dm). Or, for example, the RS25/6 model from Wilo is designed for a heating system with inch pipes (diameter 25 mm) and is capable of maintaining a pressure of up to 6 m.
Note! By the way, the Latin letter S (from the English word - speed) means, as a rule, that the product is equipped with an engine speed switch.
Sometimes the model index also indicates the mounting dimension (in mm). For example, to install a Grundfos UPS 25-60-180 pump, a distance (between the inlet and outlet pipes) of 180 mm is required.
CirculatingGrundfos pumps
It is Grundfos that has the "longest" model line of products for this purpose. Years of experience in production, constant updating of the model range, quality and reliability of manufactured devices allow the well-known Danish manufacturer to occupy leading positions in numerous ratings (compiled, by the way, according to user and professional reviews).
Opens the range of circulation pump UPS 25-40. Possessing very modest characteristics (capacity - 3.5 m³ / h, pressure - 4 m, power - 0.06 kW), it is in great demand for pumping liquid in heating systems of small country houses, summer cottages or cottages. Its price today is about 5700-6000 rubles.
The Grundfos UPS 32-80 heating circulation pump with a maximum hydrostatic head of 8 m and a power consumption of 135-220 W (depending on the rotation speed turned on) is already quite suitable for heating a two-story building of a fairly large area. The price of the product is 16500-16900 rubles.
For heating systems with automatic temperature maintenance, the company has developed pumps of the Alpha series (2 and 3). The built-in controller allows you to provide the greatest efficiency and comfort with minimal energy consumption. The popular Alpha 2 32-80 model (capacity 3.4 m³/h, head 8 m, automatic power control from 5 to 50 W) costs 18,000-18,500 rubles.
Circulation pumpsWilo
Pumps from the German manufacturer Wilo are also very popular with Russian consumers. The price, of course, depends on the technical specifications.
For example, for heating a small country house, it will be enough to use the Star-RS 25/2 model (with a capacity of 2.2 m³/hour and a head of 2 m) costing about 5,000 rubles.
But for a large country cottage it is better to buy Top-S30/10 EM worth 21,700-22,000 rubles. The high technical characteristics of this device (capacity 12 m³ / h, head 10 m, maximum liquid temperature +130 degrees) guarantee a comfortable temperature in all rooms (even a large area) of the building.
Biral products
The Swiss manufacturer Biral (since the mid-90s of the last century, part of the Grundfos Group concern) uses unique patented know-how in the manufacture of circulation pumps. A technological feature of the products is the use of permanent magnets in the design, which significantly improves the performance of electricity consumption. The high quality and reliability of the products is confirmed by the warranty period, which, depending on the model, ranges from 5 to 10 years. The model range presented on the Russian market is very wide: from the standard and very popular Biral MX 12 (with a maximum head of 3.6 m, a capacity of 4 m³ / h, a speed controller for 3 positions, costing about 7,000 rubles) to Biral A 16 (with a head of 11 mwith a capacity of 12.5 m³/h, with a functional display, an automation unit, costing 47,000-48,000 rubles).
DAB pumps
In the middle price range (4000-5000 rubles), three models from the Italian manufacturer DAB are very popular: VA 35/180, VA 55/180 and VA 65/180. Productivity - from 3 to 3.6 m³ / h, head - from 4.3 to 6.3 m, maximum coolant temperature - up to plus 110 degrees. The three-position rotation speed regulator allows you to optimize the circulation of liquid in the heating system (depending on the ambient temperature), thereby increasing the efficiency (both in terms of heat transfer and energy savings) of an individual heating system.
Popular models from Russian manufacturers
Among the models of circulation pumps for heating systems from domestic manufacturers that have received positive feedback from users, it is worth noting:
- Compass 32/40 from "Dzhileks" with a power of 65 W, a maximum head of 4 m, a capacity of 53 l / min and a cost of about 3500 rubles.
- BRS25/4G from Belamos, which in terms of technical characteristics is in many ways similar to the previous model. However, having a slightly lower productivity (48 l / min), it costs much less - 2600-2800 rubles.
- AC256 from Aquario, worth 3900-4000 rubles, differs from the two competitors described above in increased productivity (60l/min) and head (5 m).
All three models from Russian manufacturers are designed to ensure uninterrupted circulation of fluid in the heating system of a small one-story house. Warranty is 12 months.
How to choose and what to look for
The heat supply system of a private house is a rather simple, but complex structure, consisting of several necessary components. The question of which circulation pump must be purchased for its uninterrupted and reliable operation should be decided only at the last stage of design. First, the required number of heating batteries and their heat output are calculated (taking into account the area of \u200b\u200beach room, the height of the ceilings, doorways and the degree of window glazing). Then determine the total volume of the coolant and the power of the boiler that can heat it to the desired temperature.
And only after that the technical parameters of the circulation pump for heating are determined. Calculating them using various mathematical formulas, graphs or tables is a very thankless task. If you are reading this article, then at least you have a computer. Therefore, the best way to select a specific model is to use a specialized program or an online calculator (available on the websites of almost all leading manufacturers of this category of pumping equipment). Spend less time, and the result will be more accurate. When in doubt, you can always turn to professionals.
Bdetention
If you visit your country house quite rarely (for example, only on weekends, holidays or summer), then budget-class products can be used for the heating system. Well, for houses intended for permanent residence, it is better to use circulation pumps from time-tested manufacturers that provide a long-term warranty. And although the price of such devices is higher, the risk of being in an unheated room (for example, on a frosty New Year's Eve) is much less. The choice is very wide and the final decision, of course, remains with you.
