Wilo-Stratos MAXO-D

Series description


Smart glandless double circulator with screwed connection or flange connection, EC motor with integrated electronic power adjustment.


Hot-water heating systems of all kinds, air-conditioning systems, closed cooling circuits, industrial circulation systems.

Type key

Example:Stratos MAXO-D 40/0,5-8
Stratos MAXOHigh-efficiency pump (flange-end pump), electronically controlled
DDouble pump
40/Nominal connection diameter
0,5-8Nominal delivery head range [m]

Special features/product advantages

  • Intuitive operation by application-guided settings with the Setup Guide plus the combination of a new display and operating button using the Green Button Technology.
  • Highest energy efficiency through the interaction of optimised and innovative energy saving functions (e.g. No-Flow Stop).
  • Optimum system efficiency due to new, innovative, intelligent control functions like e.g. Dynamic Adapt plus, Multi-Flow Adaptation, T-const. and ΔT-const.
  • Latest communication interfaces (e.g. Bluetooth) for connection to mobile devices and direct pump linkage via Wilo Net for multi-pump control.
  • Highest electrical installation comfort through clearly arranged and large terminal room as well as optimised Wilo-Connector.


Fields of application

The pump facilitates an operation with highest system efficiency via precise setting of the control mode for the system-specific application (e.g. radiator, underfloor heating, ceiling cooling).


  • Radiator
  • Underfloor heating
  • Ceiling heating
  • Fan heater
  • Hydraulic shunt
  • Heat exchanger


  • Ceiling cooling
  • Underfloor cooling
  • Air-Conditioning devices
  • Hydraulic shunt
  • Heat exchanger

Heating and cooling combined

  • Automatic switchover

The following control modes are available depending on the selected application:

Control modes

  • Constant speed (control mode)
  • Δp-c for constant differential pressure
  • Δp-v for variable differential pressure
  • Dynamic Adapt plus for continuous (dynamic) adjustment of the delivery rate to the current requirement
  • T-const. for constant temperature regulation
  • ΔT for differential temperature control
  • Constant Q for constant volume flow control
  • Multi-Flow Adaptation: Total volume flow-determination through the feeder pump for the needs-based supply of secondary pumps in the heating circuit distributors
  • User-defined PID controller

Optional functions

  • Q-limitmax. for limiting the maximum volume flow
  • Q-limitmin. for limiting the minimum volume flow
  • No-Flow Stop (zero-flow-deactivation)
  • Automatic setback operation
  • Index circuit evaluator (Δp-c control with external actual value sensor)
  • Thermal disinfection detection (Stratos MAXO-Z)
  • Variable pitch of Δp-v pump curve

Manual settings

  • Selection of the field of application through the Setup Guide
  • Setting the related operating parameters
  • Nominal duty point: direct input of calculated duty point at Δp-v
  • Display status and history (volume flow, temperature, electric consumption, delivery head, fault display, diagnosis display)
  • Setting and resetting the energy meters (heating and cooling)
  • Pump venting function
  • Key lock for disabling the settings
  • Function for resetting the factory setting or the saved parameters
  • Configuring/parameterising the analogue inputs
  • Configuring/parameterising the binary inputs
  • Configuring/parameterising the relay outputs
  • Dual pump function (for 2 single pumps, which should be operated as double pump)

Automatic functions

  • Power adjustment according to requirements for energy-efficient operation depending on the operating mode
  • Automatic setback operation
  • Automatic deactivation at zero-flow-detection (No-Flow Stop)
  • Automatic deblocking function
  • Soft start
  • Automatic troubleshooting routines (automatic restart)
  • Automatic switchover heating/cooling mode
  • Full motor protection with integrated trip electronics

External control inputs and their functions

2x analogue input:

  • Signal types: 0 – 10 V, 2 – 10 V, 0 – 20 mA, 4 – 20 mA, PT1000
  • Applications: Remote setpoint adjustment for every operating mode, sensor inputs for temperature, differential pressure or free sensor in user-defined PID-operating mode

2x digital input:

  • For potential-free control outputs or switch
  • Parametrizable functions:
    • ext. OFF
    • ext. MIN
    • ext. MAX
    • Key lock
    • Switchover heating/cooling mode

Wilo Net for double pump management of 2 single pumps, communication of several pumps with each other and pump-remote adjustment

Signal and display functions

  • Display status operation display:
    • Setpoint
    • Actual delivery head
    • Actual volume flow
    • Heat and cooling energy meter
    • Electric consumption
    • Temperatures
  • Status display LED: Faultless operation (green LED), pump communication (blue LED)
  • Display status diagnosis display (display colour red):
    • Error codes and error description in full text
    • Remedial measures
  • Collective fault signal SSM (potential-free changeover contact)
  • Collective run signal SBM (potential-free normally open contact)

Data exchange

  • Bluetooth interface for wireless data exchange and remote operation of the pump using a smartphone or tablet.
  • Serial digital interface Modbus RTU for connecting building automation (BA) via RS485 bus system (possible with Wilo-CIF module Modbus RTU).
  • Serial digital interface BACnet MS/TP for connecting building automation (BA) via RS485 bus system (possible with Wilo-CIF module BACnet MS/TP).
  • Serial digital interface CANopen for connecting building automation (BA) via bus system CANopen (possible with Wilo-CIF module CANopen).
  • Serial digital interface LON TP/FT-10 for connecting building automation (BA) via LONWorks bus system (possible with Wilo-CIF module LON TP/FT-10).
  • Serial digital interface PLR for connecting BA via company-specific coupling module (possible with Wilo-CIF module PLR).

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

  • Main/standby operation (automatic fault-actuated switchover/time-sensitive pump alteration)
  • Parallel operation (efficiency-optimised peak load cut-in and out)


  • 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
  • Various integrated communication interfaces and optionally usable CIF-module plug-in position
  • 5 cable inlets for connecting the communication interfaces
  • Bluetooth interface
  • High resolution graphic display with Green Button and 2 additional buttons
  • User-friendly terminal room
  • Integrated volume flow and temperature sensor
  • Thermal insulation as standard for heating applications
  • Quick electrical connection with optimised Wilo-Connector for the power supply


  • Pump housing: grey cast iron with cataphoretic coating
  • Shaft: Stainless steel
  • Bearing: Carbon
  • Impeller: Plastic

Scope of delivery

  • Pump
  • 2x optimised Wilo-Connector
  • 4x threaded cable connection M16 x 1.5
  • Washers for flange screws (for nominal connection diameters DN 32 ‐ DN 65)
  • Gaskets for threaded connection
  • Installation and operating instructions


  • Special versions for operating pressure PN 16


  • Screwed connections for threaded connection
  • Counter flange (DN 32 to DN 100)
  • Adapter fittings
  • Insulation for refrigeration applications
  • Blind flanges
  • PT1000 sensors
  • Differential pressure sensor
  • Wilo CIF modules: Modbus RTU, BACnet MS/TP, CANopen, LON TP/FT-10, PLR

Duty chart

Pump curves


General overview

Edition 2017
Page format A4
Number of pages 72

PDF (46 MB)


PDF: Wilo-Stratos MAXO-D


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