Circulation pump

Most modern heating systems operate with circulation pumps. They are able to maintain a certain fluid pressure in the heating system. The main purpose of such equipment is to maintain a given pressure in the system, providing maximum heat supply to all structural elements. Due to the increased pressure indicator, all radiators in the room are freely supplied with a coolant. Sometimes, with complex design features of the heating system, several additional circulation pumps are used. With the correct setting of the equipment, it is not at all necessary to fulfill the requirements for the location of the heating boiler in the lowest part of the entire circuit.

See online calculator - Circulating Water Flow Calculator.

The overwhelming majority of modern equipment designed to provide additional circulation of the coolant in the system has a characteristic design. It has a robust metal body to which a pressure volute is attached. The heating system pipelines are connected to the two outlets of the snail. An electric motor is installed on the housing, which ensures the rotation of the impeller by rotating the rotor. Such injection of the coolant into the scroll significantly increases its outlet pressure.

All modern pumps for maintaining additional pressure in the heating system are of two types. It is a dry and wet type of rotary design.

The dry type of pumping equipment is characterized by the fact that its rotor, which is available in the design of the electric motor, does not directly contact the coolant fluid. The isolation of the rotor from the liquid is protected by a special sealing ring, which does not allow the coolant to pass through the rotor. A distinctive feature of this design is a high level of efficiency, which ranges from 75 to 85%. This type of pump does not require additional equipment, it only needs periodic maintenance.

Wet-type pumping equipment is characterized by the fact that the rotating rotor of the electric motor is constantly in direct contact with the coolant. In this case, only the electrical part of the motor is isolated. A distinctive feature of this design is the provision of the necessary lubrication of the rotating elements and the low noise level of the operating equipment. These pumps are equipped with a step speed regulator. Wet-type pumps have an efficiency level of 50 to 65%. Wet-type pumps are most often used in domestic conditions.