Wilo-Stratos GIGA

Series description


  • High efficiency, single stage, low pressure, inline centrifugal pump
  • Supplied with EC motor and electronic duty adaptation
  • Available in glanded construction , mechanical shaft seal, and flanged connections


Hot water heating systems, air conditioning, closed cooling circuits, industrial circulating systems without abrasive subtances.

Type key

ExampleWilo-Stratos GIGA 1.5/3-165
StratosHigh-efficiency pump
GIGAInline single pump
1.51Pipe connection [inch] [flanges acc. ANSI Class 125]
3-165Infinitely variable nominal pump head 3 to 165 [ft]

Special features/product advantages

  • Innovative high-efficiency pump for highest efficiency, based on a new Wilo glanded pump design
  • Highly efficient EC motor (efficiency = IE4 limit values accordingto IEC TS 60034-31 Ed.1)
  • New hydraulics ideally adjusted to the EC motor technology
  • Integrated electronic power adjustment
  • Extremely compact and space-saving design
  • Easy-to-operate due to established red button technology and display
  • Different control modes ?p-c, ?p-v, PID and n=const. (manual control mode)
  • Control range is up to three times as high as for conventional electronically controlled pumps
  • Analogue interfaces 0-10 V, 2-10V, 0-20 mA, 4-20 mA
  • Optional interfaces for bus communication using plug-in IF-Modules
  • Integrated double pump management with efficiency-optimized peak-load activation
  • Two configurable signal relays for run and fault signals
  • Fault management tailored to heating and air-conditioning applications
  • Access disable on the pump can be activated
  • Integrated full motor protection
  • High corrosion protection due to cataphoretic coating
  • Condensate drainage as standard
  • Integral threaded pump feet for foundation installation

Technical data

  • Permitted temperature range of the fluid:-4°F to 284°F [-20 °C to +140 °C]
  • Mains connection
    • 3~460 V (±10 %), 60 Hz
    • 3~400 V (±10 %), 50/60 Hz
    • 3~380 V (-5 %/+10 %), 50/60 Hz
  • Protection class IP 55, insulation class F
  • Max. operating pressure 232 psi [16 bar] to 248°F [120 °C], 189 psi [13 bar] to 284°F [140 °C]


  • Pump housing and lantern: EN-GJL-250
  • Impeller: PPS-GF40
  • Shaft: 1.4122
  • Mechanical seal: AQEGG; other mechanical seals on request


Operating modes

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

Manual operation level

  • Red button and display

Manual functions

  • Differential pressure setpoint setting
  • Speed setting (manual control mode)
  • Operating mode setting
  • Pump ON/OFF setting
  • 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 IF-modules/IR monitor Plug-in position for Wilo IF-modules (Modbus, BACnet, CAN, PLR, LON) for connection to building automation

Protection functions

  • Full motor protection with integrated trip electronics
  • Access disable

Dual pump management (double pump or 2 x single pump)

  • 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)


  • Wrench attachment point at pump body (for threaded pipe union pumps with P2< 100 W)
  • For flange-end pumps: Flange versions
    • Standard version for DN 32 to DN 65 pumps: PN 6/10 combination flange (PN 16 flange according to EN 1092-2) for PN 6 and PN 16 counter flanges
    • Standard version for DN 80/DN 100 pumps: PN 6 flange (designed for PN 16 according to EN 1092-2) for PN 6 counter flange
    • Special version for DN 32 to DN 100 pumps: PN 16 flange (according to EN 1092-2) for PN 16 counter flange
  • Plug-in position for optional extension with Wilo-IF‐Modules
  • Standard thermal insulation for heating applications

Scope of delivery

  • Pump
  • Installation, Operation, and Maintenance Manual


R1 version without differential pressure sensor

Duty chart

Pump curves


Approved fluids (other fluids on request)

Heating water (in accordance with VDI 2035)

Water-glycol mixtures (for 20-40 vol.% glycol and fluid temperature ≤ 40 °C)

Cooling and cold water

Permitted field of application

Standard version for operating pressure pmax

16 bar (up to +120 °C) bar

Special version for operating pressure pmax

- bar

Temperature range at max. ambient temperature +40 °C

-20...+140 °C (depending on the fluid)

Max. ambient temperature

+40 °C

Installation in closed buildings

Outdoor installation


Pipe connections

Nominal connection diameters DN

40 - 65


Pump housing






Impeller (special version)

Pump shaft


Mechanical seal


Other mechanical seals

On request

Electrical connection

Mains connection

3~380 V ±10%, 50/60 Hz

Speed range



Motor technology

EC motor

Integrated full motor protection

Protection class

IP 55

Insulation class


Emitted interference

EN 61800-3

Interference resistance

EN 61800-3

Residual-current protection device (RCD)

Installation options

Pipe installation (≤ 15 kW motor power)

Support-bracket mounting


Number of pages 212

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PDF: Wilo-Stratos GIGA


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