Circulator pumps

KSB-Rio N / Z N Circulator Pumps with Manual Speed Control




Maintenance-free, glandless wet rotor pump, flanged or screw-ended, with three speed levels; in twin pump design (Rio Z) for standby operation with integrated swing check valve or, on option, peak load operation (parallel operation).



Hot water heating systems, heat recovery systems and cooling circuits in air-conditioning systems.


Operating modes

▪ Different speed levels


Automatic functions

▪ Full motor protection with integrated trip electronics
(from size 25-70 motor protection to be provided by the



Overview of technical data
Type of bearing Plain bearings
Drive Electric motor
Drive frequency 50 Hz / 60 Hz
Type of drive Electric motor
Drive voltage Low voltage
Connection to power supply 400 V, 3~; 230 V, 1~
Impeller material (EN standard) POLYPROPYLEN
Type of installation In- line
Type of coupling None
Type of lubrication Oil / Product lubrication
Max. permissible fluid temperature 120 °C
Nozzle position In- line
Maximum rated pressure (discharge) PN 10
Pump set location Dry installed
Shaft material (EN standard) X 46 CR 13
Suction characteristics Non- priming
Type of casing Volute casing
Type of impeller Closed / Radial
Type of connection Screw- ended, flange
UNSPSC classification 4015150300
Casing material (EN standard) EN- GJL-250
eClass assignment 36410105; 36410101;36410100;36410000
Maximum head 4, 00 m
Installation position Horizontal or vertical
Shaft seal type Seal- less
Main applications Building services; Water
Casing material Cast iron
Maximum discharge-side pressure 10 bar
Type of installation Stationary
Maximum flow rate 76 m³/h
Maximum speed of rotation 2. 800 1/min


EBARA            GRUNDFOS           KSB          WILO        TSURUMI

Grundfos- UP-UPS Circulator pumps




Grundfos-UPS-UPAUPS pumps constitute a complete range of 3-speed circulator pumps, available both in 50 and 60 Hz.

The pumps can be used in both open and closed systems. UPS pumps are of the canned-rotor type, i.e. pump and motor form an integral unit without a shaft seal and with only two gaskets for sealing. The bearings are lubricated by the pumped liquid.



UPS pumps are designed for circulation of liquids in heating and air-conditioning systems. Pumps with bronze or stainless steel housings are also suitable for use in hot-water service systems. Examples of typical applications are:

  • One- and two-pipe heating systems
  • Main pumps
  • Zone pumps
  • Boiler shunt pumps
  • Pumps for heating surfaces
  • Calorifiers
  • Underfloor heating systems
  • Solar heating systems
  • Heat pump systems
  • Geothermal heating systems
  • Heat recovery systems
  • Two-pipe air-conditioning systems
  • Pumps for refrigeration units.


Features and benefits

  • UP-UPS-CurveMaintenance-free
  • Low noise
  • Low energy
  • Complete range
  • Available with corrosion-resistant stainless steel or bronze pump housing
  • Wide range of accessories.










EBARA            GRUNDFOS           KSB          WILO        TSURUMI