Monoblock pump

Monoblock pump

Monoblock pump is a centrifugal pump, the casing of which is combined with an electric motor in one unit. Water enters the pump in the axial direction and exits radially.

The impeller of the monoblock pump is mounted on the electric motor shaft, which allows for a reduction in overall dimensions as well as friction losses in additional bearings. For air cooling of the electric motor, a rotating blade is mounted on the shaft end opposite to the impeller. The blade is covered with a protective mesh.

Application area

The universal design and wide range of working parameters allow monoblock pumps to be used for circulation in heating, cooling, and hot water supply systems, booster pump stations for water supply and fire extinguishing, for increasing pressure, and simply for liquid transfer in industry and agriculture.

In heating systems, a monoblock pump is used only if a wet rotor pump cannot provide the required flow rate and pressure, and the noise created does not exceed permissible limits.


  • Wide range of flow rates and pressures
  • Compact design
  • Low price
  • High efficiency from 30% to 80%
  • Not demanding to water quality
  • Can handle water temperatures over 100°C


  • Presence of roller bearings and shaft seals
  • High noise and vibration levels compared to wet rotor pumps.
  • Only one mounting position is allowed, where the shaft axis is horizontal
  • The monoblock pump must be installed on a frame or foundation.
  • Mechanical shaft seals require maintenance.

Replacement options

  • In-line pump (input and output nozzles are placed in a single line)
  • Wet rotor pump (if the flow rate is required up to 100m³/h, with a head not exceeding 15m).
District heating substations
Circulation pumps
Inline pumps
Plate heat exchangers
flow rate
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Andriy Slastin

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