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Wilo-Stratos GIGA


High-efficiency inline pump with EC motor and electronic duty adaptation in glanded construction. Version as single-stage low-pressure centrifugal pump with flange connection and mechanical shaft seal.


Pumping of heating water (acc. to VDI 2035), cold water and water/glycol mixtures without abrasive substances in heating, cold water and cooling systems.

Type key

ExampleWilo-Stratos GIGA 40/1-51/4.5
StratosHigh-efficiency pump
GIGAInline single pump
40Nominal flange diameter DN
1-51Nominal delivery head range in [m]
4.5Orientation value of the rated power P2 in kW
-R1Version without differential pressure sensor

Special features/product advantages

  • Innovative high-efficiency pump for maximum total-system efficiency based on a new Wilo glanded design
  • High-efficiency EC motor (degrees of efficiency above IE4 class limit values acc. to IEC 60034-30)
  • Highly efficient hydraulics, optimally adapted to the EC motor technology, with optimised efficiency, minimum efficiency index (MEI) ≥ 0.7 according to ErP Directive 2009/125/EC [Commission Regulation (EU) 547/2012].
  • Control range is up to three times higher than that of conventional electronically controlled pumps
  • Optional interfaces for bus communication using plug-in IF-Modules

Technical data

  • Minimum Efficiency Index (MEI) ≥ 0.7
  • Minimum efficiency index (MEI) ≥ 0.7
  • Permitted temperature range of the fluid: -20 °C to +140 °C
  • Mains connection 3~480 V ±10 %, 50/60 Hz, 3~440 V ±10 %, 50/60 Hz, 3~400 V ±10 %, 50/60 Hz, 3~380 V -5 % +10 %, 50/60 Hz
  • Protection class IP 55
  • Max. operating pressure 16 bar up to +120 °C, 13 bar up to +140 °C


Operating modes

  • Δp-c for constant differential pressure
  • Δp-v for variable differential pressure
  • PID control
  • Control mode (n=constant)

Manual operation level

  • Red button and display

Manual functions

  • Differential pressure setpoint setting
  • Setting the speed (manual control mode)
  • Setting the operating mode
  • Setting the pump ON/OFF
  • Configuration of all operating parameters
  • Error acknowledgement

External control functions

  • "Overriding Off" control input
  • "External pump cycling" control input (effective only in double pump operation mode)
  • Analogue input 0–10 V, 0–20 mA for manual control mode (DDC) and remote setpoint adjustment
  • Analogue input 2–10 V, 4–20 mA for manual control mode (DDC) and remote setpoint adjustment
  • Analogue input 0–10 V for actual value signal from pressure sensor
  • Analogue input 2–10 V, 0-20 mA, 4–20 mA for actual value signal from pressure sensor

Signal and display functions

  • Collective fault signal SSM
  • Collective run signal SBM

Data exchange

  • Infrared interface for wireless data exchange with IR-Monitor/IR-Stick
  • Plug-in position for Wilo IF-Modules (Modbus, BACnet, CAN, PLR, LON) for connection to building automation

Safety functions
  • Full motor protection with integrated trip electronics
  • Access disable

Dual pump management(2 x single pumps)

  • Main/standby operation (automatic fault-actuated switchover)
  • Pump cycling main/standby operation after 24 hours
  • Parallel operation
  • Parallel operation (efficiency-optimised peak-load activation and deactivation)

Scope of delivery

  • Pump
  • Installation and operating instructions


  • Version …-R1 without differential pressure sensor
  • ...-S1 variant with special mechanical shaft seal (at additional charge)


  • 3 Mounting brackets with fixation material for installation on a base
  • Installation aid for mechanical seal
  • IR-Monitor
  • IR-Stick
  • IF-Module PLR for connecting to PLR/interface converter
  • IF-Module LON for connection to the LONWORKS network
  • IF-Module BACnet
  • IF-Module Modbus
  • CAN IF-Module
  • VR-HVAC control system
  • Control system CCe-HVAC
  • Control system SCe-HVAC
  • Differential pressure sensor (DDG)

General notes - ErP (ecological design-) directive

  • The benchmark for most efficient water pumps is MEI ≥ 0.70
  • The efficiency of a pump with a trimmed impeller is usually lower than that of a pump with the full impeller diameter. The trimming of the impeller will adapt the pump to a fixed duty point, leading to reduced energy consumption. The minimum efficiency index (MEI) is based on the full impeller diameter.
  • The operation of this water pump with variable duty points may be more efficient and economic when controlled, for example, by the use of a variable speed drive that matches the pump duty to the system.
  • Information on benchmark efficiency is available at
  • Pumps with power consumption > 150 kW or a volume flow QBEP < 6 m3/h are not subject to the Ecodesign Directive for water pumps. Therefore, no MEI value is shown.

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