The life of modern society is closely intertwined with the widespread use of not only electricity, but also thermal energy. Residential buildings, businesses, various office spaces and more are heated using thermal energy, which is also used for cooking, electricity generation and many other human activities.

The comfort of human working and leisure conditions is directly related to such concepts as heating, ventilation, hot water supply and others. For these purposes, hot water with a temperature of 80-90 °C is most commonly used by the consumer.
In general, the supply of thermal energy to any object is provided by a system consisting of three main elements: a heat source (for example, a boiler room), a thermal network (for example, hot water or steam pipes) and a heat sink (for example, in rooms water heating radiators).
Central heating based on CHP plants is the most rational solution for most cities. It not only saves significant amounts of fuel, but also significantly reduces harmful emissions into the atmosphere.
The heat carrier from urban CHP plants is fed to central heating points (CHPs) or individual heating points of multi-storey buildings (IHPs) through district heating pumps.
For these purposes central heating pumps is used. Network pumps are designed to supply hot water through district heating systems and, depending on the installation location, are used as pumps for:
initial lifting, supplying water to the heaters through the return pipe;
second elevator to supply water to the district heating system after the heaters;
Circulation pumps installed after water boilers.
Network pumps can operate both in CHP plants and in intermediate pump stations of district heating systems. Hot water is supplied to the urban area through main heating pipes directly from the mains water collectors of CHP plants. The main heating pipes have branches through which the intra-block distribution connects to the central heating points (CHPs). CHPs include heat exchange equipment with regulators that provide hot water supply to apartments and buildings.
central heating pumps (network pumps) must have increased reliability, since malfunctions or malfunctions in pump operation affect the operating mode of CHP plants and consumers. The main feature of the operation of network pumps is fluctuations within wide limits in the temperature of the supplied water, which causes changes in the pressure inside the pump. Line pumps must operate reliably over a wide range of capacities, which undoubtedly requires a constant pressure characteristic. Changing the parameters of individual pump types can be achieved by trimming the impellers within the limits specified by the manufacturer; The decrease in efficiency in this case should not exceed 3%.
The reliability and efficiency of central heating pumps are directly affected by:
proper selection of the pump according to the required parameters of the network;
taking into account the features of its operation and inclusion in the technological scheme of the equipment;
precision and quality of production;
Qualified installation and subsequent operation.
Central heating pumps are also used to heat multi-storey buildings as part of the individual heating point (IHP).
An individual heating point is a device for receiving, calculating and distributing thermal energy from an urban heating network for the heating and hot water supply needs of the object on which it is installed, for example, a multi-storey building. IHPs are located in a separate room in the basement or technical floor of the building. A typical IHP block includes:
plate heat exchangers;
shut-off and control valves;
central heating pumps to circulate the heat carrier in the system;
control and measuring instruments;
Power and control panels with controllers.
Small circulation pumps with wet rotors or in-line pumps are used as central heating pumps for IHPs. The most commonly used pumps are Grundfos, Wilo, EBARA pumps.