Wilo-Stratos-Z Wet-rotor circulation pump with threaded or flanged connection


Energy savings due to increased system efficiency with Q-Limit function (flow limitation)
Optimised display for improved readability and control
Installation in small spaces thanks to compact design and position-independent LCD display
Modular concept for connection to all common bus systems (e.g. Modbus, BACnet, CAN, LON, PLR)
Corrosion-resistant pump housing made of bronze for applications with possible oxygen intrusion
Proven quality and reliability
Typesetting program
After 19 years of success, the Wilo-Stratos high-performance pump will be completely removed from the product range and replaced by the new Wilo-Stratos MAXO smart pump by the end of March 2020. The new Wilo-Stratos MAXO pump technology will continue the success of the Stratos series.


Glandless circulation pump with threaded connection or flange connection, EC motor and automatic speed control.


All types of drinking water circulators, all hydronic heating systems, air-conditioning systems and closed cooling circuits, industrial circulation systems


Modes of operation

  • Manual operation (n = constant)
  • Δp-c for constant differential pressure
  • Δp-v for variable differential pressure
  • Δp-T for differential pressure dependent on temperature control (programmable via IR-Stick, IR-Monitor, Modbus, BACnet, LON or CAN)
  • Q-Limit to limit max. flow (can only be set on the IR-Stick)

Manual control

  • Setting of operating modes
  • Setting the flow rate value
  • Setting for automatic speed reduction mode
  • Pump ON/OFF setting
  • Speed setting (manual switch-over)

Automatic control

  • Infinitely variable speed control according to mode of operation
  • Automatic downmilling operation
  • Lockout function
  • Soft start
  • Full motor protection with integrated electronic shutdown

External control

  • Priority off control input (possible with Stratos IF-modules)
  • Minimum power priority input (available with Stratos IF-modules)
  • Control input "Analog In 0 - 10V" (remote speed switching), possible with Stratos IF-modules
  • Control input "Analog In 0 - 10 V" (remote setpoint adjustment), possible with Stratos IF-modules

Alarms and display

  • Generalized fault indication (potential free NO contact)
  • Separate fault indication (potential free normally open contact), possible with Stratos IF-Modules
  • Lighted fault indicator
  •  LCD display for the indication of pump parameters and error codes

Data exchange

  • Infra-red interface for wireless data exchange with IR-Stick/IR monitor
  • Modbus RTU serial digital interface for connection to a building automation system via RS485 bus system (possible with Stratos IF-modules)
  • BACnet MS/TP Slave serial digital interface for connection to a building automation system via RS485 bus system (possible with Stratos IF-modules).
  • CAN serial digital interface for connection to a building automation system via CAN bus system (possible with Stratos IF-modules)
  • LON serial digital interface to connect to a LONWorks network (available with Stratos IF-modules)
  • PLR serial digital interface for connection to a building automation system via a Wilo interface converter or special communication modules (available with Stratos IF-Modules)

Twin pump control (twin pump or two single pumps)

  • Main/standby operation (automatic switchover in the event of malfunction/pump timer operation): various combinations with Stratos IF-Modules (accessories) possible
  •  Dual pump operation (switch-on of second pump during peak demand with efficiency optimisation): various combinations with Stratos IF-Modules (accessories) possible


  • Keyed casting on pump casing (for pumps with threaded pipe connection P2 ≤ 100 W)
  • For pumps with flange connection: flange design
  • Standard version for pumps DN 40 to DN 65: Combination flange PN 6/10 (flange PN 16 as per EN 1092-2) for counter flanges PN 6 and PN 16
  • Special version for pumps DN 40 to DN 65: Flange PN 16 (acc. EN 1092-2) for counter flange PN 16,
  • Socket for the optional addition of Wilo IF-Modules
  • Thermal insulation as standard

Model overview

Those. information

Scope of delivery

  • Pump
  • Including thermal insulation of the casing
  • Including gaskets for screw fittings (loose)
  • Including flange bolt washers (for nominal diameters DN 40 to DN 65)
  • Including assembly and operating instructions

Deciphering of designation

Example: Wilo-Stratos-Z 40/1-8
Stratos High efficiency pump (screwed or flanged), electronically regulated
Z Single pump for drinking water circulation system
40/ Nominal diameter for connection
1-8 Nominal head [m]

Technical Specifications

  • Permissible temperature range
    • Drinking water up to 3.57 mmol/l (20 °dH): 0 °C to +80 °C
    • Heating water: -10 °C to +110 °C
  • Connection to mains 1~230 V, 50/60 Hz
  • Protection class IPX4D
  • Threaded connection or flange connection (depending on type) Rp 1 to DN 65
  • Max. operating pressure standard version: 6/10 bar (special version: 16 bar)


  • Pump housing in bronze (Types 30/1-12 and 40/1-8 also in cast iron)
  • Impeller: Plastic material
  • Shaft: Stainless steel
  • Bearings: Graphite impregnated with synthetic resin


  • Glandless circulation pump with electronically commutated motor and integrated automatic speed control
  • Green button technology and graphic display
  • Motor protection with electronic switch-off
  • Plug-in connection for extension of functions with IF modules for building automation
  • Impeller with curved three-dimensional blades and separation cup made of fibre-based synthetic material


Stratos, Stratos-D, Stratos-Z, Stratos-ZD, Stratos MAXO, Stratos MAXO-D, Stratos MAXO-Z, Stratos PARA, Stratos PARA-Z,Yonos MAXO, Yonos MAXO-Z, Yonos ECO BMS, Yonos PARA HF, TOP-S, TOP-Z, TOP-SD, TOP-RL, TOP-I Download
Wilo-Stratos/-D/-Z/-ZD Download
Documentation Download



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