Series description

Special features/product advantages

  • AC pumps with electrical quick connection
  • All plastic parts that come into contact with the fluid fulfil KTW recommendations
  • Thermal insulation as standard for Star-Z 15 TT.
  • Star-Z 15 TT with integrated timer and thermostat, LC display with symbolic language, Green Button Technology and automatic detection of the thermal disinfection of the domestic hot water tank, as well as ball shut-off valve on suction side and non-return valve on pressure side.

Design type

Glandless circulation pump with threaded connection


Domestic hot water circulation systems in industry and building services.


Operating modes

  • Speed stage switching (Star-Z -3 only)

Manual functions

  • Setting of the speed stages (1 speed stage, 3 speed stages with Star-Z...-3 pumps)

Automatic functions

  • Time switching function for programming of 3 switch-on or switch-off times (Z 15 TT only)
  • Temperature control for maintaining a constant return temperature in the domestic hot water circulation system (Z 15 TT only)
  • Thermal disinfection routine (detection and support of thermal disinfection of the domestic hot water tank) (only Z 15 TT)
  • Blocking protection (Z 15 TT only)

Signal and display functions

  • LCD screen for display of pump data and fault codes (Z 15 TT only)


  • Wrench attachment point on the pump body (Star-Z 25 only)
  • Cable inlet possible from both sides (Star-Z 20/..., Star-Z 25/... only)
  • quick connection with spring clips
  • Blocking-current proof motor
  • Integrated non-return valve on the pressure side (only Star-Z 15 TT)
  • Integrated ball shut-off valve on suction side (only Star-Z 15 TT)
  • Including time switch (only Z 15 TT)

Scope of delivery

  • Pump
  • Gaskets for threaded connection
  • Installation and operating instructions
  • Thermal insulation (Star-Z 15 TT only)

Type key


Wilo-Star-Z 20/1Wilo-Star-Z 15 TT


Standard pump


Circulation pump


Nominal connection diameter


Nominal delivery head [m]


with built-in time switch and temperature control (only Z 15 TT)


AC motor (1~)


Three phase motor (3~)


3 speed stages

Technical data

  • Constant speed or, for Star-Z...-3, three selectable speed stages
  • Fluid temperature:
    • Drinking water up to 3.21 mmol/l (18 °dH): max. +65°C, in short-time duty (2 h) up to +70°C
  • Mains connection 1~230 V, 50 Hz or, for Star-Z 25/2 DM, 3~400 V, 50 Hz
  • Protection class IP 44 (IP 42 for Star-Z 15 TT)
  • Nominal diameter Rp ½, Rp 1
  • Max. operating pressure 10 bar


  • Pump housing:
    • Brass: Star-Z 15
    • Bronze: Star-Z 20, -Z 25
  • Impeller: Plastic
  • Shaft:
    • Stainless steel: Star-Z 15
    • Oxide ceramic: Star-Z 20, -Z 25
  • Bearing: Carbon, synthetic resin impregnated

Duty chart




General overview 2018 International version

Article Number 2200591
Edition 2018
Version number 1
Page format 209.9 x 297.0 mm
Number of pages 72

PDF (11 MB)



PDF: Wilo-Star-Z


Page selection

Format selection

Optional information

You can enter any personal information that you want to be displayed in the header.