Wilo-Stratos-D Double glandless circulation pump with flange connection


  • Energy savings thanks to increased system efficiency with Q-Limit (flow limitation)
  • Enhanced EEI ≤0,23 in all twin pumps
  • Optimized display for improved readability and control
  • Small footprint due to compact design and position-independent LCD
  • Modular concept for connection to all common bus systems (e.g. Modbus, BACnet, CAN, LON, PLR)
  • Control system for twin pumps with additional IF modules
  • Proven quality and reliability

Decommissioning program

The Wilo-Stratos high-performance pump, which has been a success for 19 years, will be completely phased out by the end of March 2020 and replaced by the new Wilo-Stratos MAXO smart pump. The new Wilo-Stratos MAXO pump technology will continue the success of the Stratos series.


Double wet rotor circulator pump with flange connection, electronic commutated motor with automatic speed control


Heating systems, air-conditioning systems, closed cooling circuits, industrial circulation systems

Heating/air conditioning systems, closed cooling circuits


Operating modes

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

Manual control

  • Setting of operating modes
  • Setting the flow rate
  • Setting the automatic speed reduction mode
  • Setting the pump ON/OFF
  • Setting the speed (manual changeover)

Automatic control

  • Flexible power adjustment depending on operating mode
  • Automatic operation with reduction
  • Disengagement function
  • Fast start-up
  • Full motor protection with integrated electronic shutdown

External control

  • Control input «Off by priority» (possible with Stratos IF modules)
  • Control input «Min power by priority» (possible 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 change), possible with Stratos IF-modules

Alarms and indication

  • Separate/common fault alarm (potential-free NC contact), programmable with IR memory card/IR monitor
  • Generalized fault alarm (potential-free NC contact)
  • Separate operation alarm (potential free normally open contact), possible with Stratos IF modules
  • Light Fault indicator
  • LCD display for pump parameters and error codes

Data exchange

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

Control of twin pumps (twin pump or two single pumps)

  • Operating/standby mode (automatic changeover in case of fault/pump timer operation): various combinations with Stratos IF-Modules (accessories)
  • Two Pump Co-Operation (switch-on second pump during peak demand with efficiency optimisation): various combinations with Stratos IF Modules (accessories)


  • flange versions:
  • Standard version for pumps DN 32 – DN 65: Combination flange PN 6/10 (flange PN 16 as per EN 1092-2) for counter flanges PN 6 and PN 16
  • Standard version for DN 80 pumps: Flange PN 6 (designed for PN 16 in accordance with EN 1092-2) for counter flange PN 6
  • Special version for pumps DN 32 to DN 80: Flange PN 16 (in accordance with EN 1092-2) for counter flange PN 16,
  • Integrated change-over valve in the pump casing
  • Socket for optional Wilo IF-Modules

Model overview

Those. information

Name decoding


Wilo-Stratos-D 40/1-8


High efficiency pump (flanged pump), electronically regulated


Double pump


Nominal diameter for connection


Nominal head [m]

Technical data

  • Liquid temperature range from -10 °C to +110 °C
  • Power connection 1~230 V, 50/60 Hz
  • Protection class IPX4D
  • Flange connection DN 32 to DN 80
  • Maximum operating pressure with standard version: 6/10 bar or 6 bar (special version: 10 bar or 16 bar)


  • Pump body: Grey cast iron
  • Shaft: Stainless steel


  • Double wet rotor circulation pump with electronically commutated motor and integrated automatic speed control
  • Green button technology and graphical display
  • Motor protection with electronic cut-out
  • Socket connection for function expansion with IF modules for building automation
  • Flexible impeller with curved three-dimensional blades and separation cup made of synthetic fibre-based material


Wilo-Stratos/-D/-Z/-ZD Download



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