Wilo-Stratos-ZD | Wilo
Your advantages

Your advantages

  • Energy savings due to greater system efficiency with the Q-Limit function (volume flow limiter)
  • Enhanced display for better readability and ease of operation
  • Space-saving installation thanks to compact design and variable-orientation LC display
  • Modular concept for connection of all conventional bus systems (e.g. Modbus, BACnet, CAN, LON and PLR)
  • Dual pump management via retrofittable IF-Modules:
  • Tried-and-tested quality and reliability
Series description


Twin-head glandless pump with flange connection, EC motor and automatic power adjustment


Domestic hot water circulation systems of all kinds, hot-water heating systems of all kinds, air-conditioning, closed cooling circuits, industrial circulation systems


Operating modes

  • Constant speed (n=constant)
  • Δp-c for constant differential pressure
  • Δp-v for variable differential pressure
  • Δp-T for temperature-controlled differential pressure (programmable via IR-Module, Wilo-IR-Stick, IR-Monitor, Modbus, BACnet, LON or CAN)
  • Q limit for limiting the maximum volume flow (setting only via IR-stick)

Manual functions

  • Setting the operating mode
  • Differential pressure setpoint setting
  • Setting automatic setback operation
  • Setting the pump ON/OFF
  • Setting the speed (manual control mode)

Automatic functions

  • Continuous power adjustment according to the operating mode
  • Automatic setback operation
  • Deblocking function
  • Soft start
  • Full motor protection with integrated trip electronics

External control functions

  • "Overriding Off" control input (possible with Stratos IF-Modules)
  • "Overriding Min" control input (possible with Stratos IF-Modules)
  • "Analogue In 0 - 10 V" control input (remote speed adjustment) (possible with Stratos IF-Modules)
  • "Analogue In 0 - 10 V" control input (remote setpoint adjustment) (possible with Stratos IF-Modules)

Signal and display functions

  • Individual / collective fault signal (potential-free NC contact) (programmable with the IR-Monitor)
  • Collective fault signal (potential-free NC contact)
  • Individual run signal (potential-free NO contact) (possible with Stratos IF-Modules)
  • Fault signal light
  • LCD display for indication of pump data and error codes

Data exchange

  • Infrared interface for wireless data exchange with IR-Module/Wilo-IR-Stick/IR-Monitor
  • Modbus RTU serial digital interface for connection to building automation BA via RS485 BUS system (possible with Stratos IF-Modules)
  • BACnet serial digital interface MS/TP slave for connection to building automation BA via RS485 BUS system (possible with Stratos IF-Modules)
  • CAN serial digital interface for connection to building automation BA via IF-Modules BUS system (possible with Stratos IF-Modules)
  • LON serial digital interface for connection to a LONWorks network (possible with Stratos IF-Modules)
  • PLR serial digital interface for connection to BA via Wilo interface converter or company-specific coupling modules (possible with Stratos IF-Modules)

Dual pump management (twin-head pump or 2 x single pumps)

  • Main/standby operation (automatic fault-actuated switchover/time-dependent pump cycling): various combinations with Stratos IF-Modules (accessories) possible
  • Parallel operation (efficiency-optimised peak load activation and deactivation): various combinations with Stratos IF-Modules (accessories) possible


  • Flange versions:
  • Standard version for DN 32/DN 40 pumps: PN 6/10 combination flange (PN 16 flange according to EN 1092-2) for PN 6 and PN 16 counter flanges,
  • Special version for pumps DN 32 / DN 40: PN 16 flange (according to EN 1092-2) for PN 16 counter flange,
  • Double switchover valve in pump housing
  • Plug-in position for optional extension with Wilo-IF-Modules

Scope of delivery

  • Pump
  • Washers for flange screws (with nominal connection diameter DN 32 / DN 40)
  • Installation and operating instructions

Type key


Wilo-Stratos-ZD 40/1-8


High-efficiency pump (flange-end pump), electronically controlled


Twin-head pump for domestic hot water circulation


Nominal connection diameter


Nominal delivery head range [m]

Technical data

  • 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
  • Mains connection: 1~230 V, 50/60 Hz, 3~230 V, 50/60 Hz
  • Protection class IPX4D
  • DN 32 to DN 40 flange connection
  • Max. operating pressure, standard version: 6/10 bar (special version: 16 bar)


  • Pump housing: Cast iron
  • Thermal insulation: polypropylene
  • Shaft: Stainless steel
  • Bearing: Carbon, synthetic resin-impregnated
  • Impeller: Plastic


  • Twin-head glandless pump with ECM technology and integrated automatic power adjustment
  • Green Button technology and graphic display
  • Motor protection with trip electronics
  • Plug connection for functional extension with optional IF-Modules for building automation (BA)
  • Impeller with three-dimensionally curved blades and plastic sealing tube made of carbon fibre composite material

Installation and operating instructions


Article Number 2132717
Edition 2016-04
Page format 148.2 x 209.9 mm
Number of pages 202
PDF (8 MB)

General overview (Documents)

General overview 2021 International version

Edition 2020
Page format 209.9 x 297.0 mm
Number of pages 74
PDF (10 MB)

Certificate REACH (Documents)

REACH regulation

Edition 2020-08
Page format 209.9 x 297.0 mm
Number of pages 2
PDF (158 KB)
Product list
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Product descriptionPump connectionEnergy efficiency index (EEI)Port-to-port length L0Maximum operating pressure PNMains connectionGross weight, approx. mPieces per palletArticle number