Circulation pumps for heating systems are becoming very popular today. The main advantage of the device is energy saving. The fact is that it accelerates the circulation of the coolant in the pipes and contributes to the rapid heating of the rooms. As for the design of the device, it is not complicated. The following elements can be distinguished: a housing (steel, brass or cast iron), a rotor (ceramic or steel), an impeller wheel, a rotating rotor, and also an engine that ensures the operation of all elements.
It should be noted that the water level in the expansion tank remains at the same level, regardless of whether the device is turned on or not.
Circulation pumps for heating systems should be classified into two types - “wet” and “dry”. If you are using the first type of apparatus, then the rotor with the impeller is partially in the water. In this case, an unheated coolant can cool a running engine. In this case, special attention should be paid to the material of the case: it should not give in to corrosion.
In “dry” pumps, the rotor does not come into contact with water, as it is separated from it by a special plate. This type of device can be classified in more detail into vertical, block and horizontal pumps.
“Wet” circulation pumps for heating systems operate for a long time without additional maintenance, practically do not create noise. However, a big disadvantage of the presented device is its not very high coefficient of performance. Therefore, it is best to use it in small houses or apartments. Although modern devices are already being made somewhat improved.
Naturally, regardless of the type of unit, it must be correctly placed in the system. For example, “wet” devices are only horizontal and can be installed on both the supply and return pipes. As for the installation itself, it can even be done by yourself. Circulation pumps for heating systems are mounted with wrenches and bypasses. Additionally, it is necessary to install a filter that will not allow large debris to get inside the device. Also, the shut-off valve will need to be mounted on the pipe in which the bypass will be installed (the pipe, which is parallel to the pump). This will make it possible to use the design without a pump.
As for the question of how to choose circulation pumps for heating systems, it is already necessary to pay attention to the length of the pipes, the operating conditions of the device, as well as the needs of each individual house or apartment. It is important to consider the power of the pump and the speed at which it pumps the coolant through the system. It is best to choose a unit in which you can adjust these two parameters. Too powerful devices are not worth buying to protect yourself from unnecessary noise.
Now on the market there are a huge number of manufacturers: Lowara, DAB, as well as circulation pumps for Wilo heating systems. The choice of brand depends on its reputation.