Wilo-Star-Z Glandless circulation pump with screw connection


  • Single-phase pumps with quick electrical connection
  • All plastic parts in contact with pumped media have KTW approval


Glandless circulation pump with threaded connection


Potable water circulation systems for industrial and civil engineering applications.


Modes of operation

Switching speed steps (Star-Z...-3 only)

Manual control

Speed step regulation (1 speed step, 3 speed steps for Star-Z...-3)


  • Keyhole moulding on the pump housing (Star-Z 25 only)
  • Double-sided cable entry option
  • Quick connection via spring clamp terminals
  • Blocking current proof electric motor

Model overview


Product designation Article number
Star-Z 20/1 4028111
Star-Z 25/2 EM 4029062
Star-Z 25/6-3 4047573
Star-Z 20/4-3 4081193
Star-Z 20/5-3 4081198
Star-Z 20/7-3 4081203

Those. information

Scope of delivery

  • Pump
  • Seals for screw connections
  • Installation and Operating Instructions

Explanation of designation

Example: Wilo-Star-Z 20/1
Star Standard pump
Z Circulation pump
20/ Nominal diameter for connection
1 Nominal head [m]
-3 3 speed steps

Technical data

  • Constant speed or three selectable speed stages for Star-Z...-3
  • Pumped liquid temperature:
    • Drinking water up to 3.21 mmol/l (18 °dH): max. +65 °C, in non-uniform mode (2 h) up to +70 °C
  • Connection to mains 1~230 V, 50 Hz
  • Protection class IP44
  • Nominal diameter Rp ½, Rp 1
  • Max. operating pressure 10 bar


  • Pump housing: bronze
  • Impeller: synthetic material
  • Shaft: oxide ceramic
  • Bearings: Graphite impregnated with synthetic resin


Wilo-Star-Z/-ZD Download
Documentation Download



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