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Wilo-Stratos MAXO | Wilo
Advantages to you
Wilo-Stratos MAXO (North America)

Your advantages

  • Intuitive operation by means of application-guided settings with the Setting assistant plus the combination of a new display and operating button using Green Button Technology.
  • Maximum energy efficiency thanks to the combination of optimized and innovative energy-saving functions (e.g. No-Flow Stop).
  • Optimum system efficiency thanks to new and innovative intelligent control functions, such as 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 networking for multiple pump control via Wilo Net.

Environmentally friendly properties

  • A combination of optimised and innovative control modes provides maximum energy efficiency
  • Highest system efficiency with the innovative “Multi-Flow Adaptation” and energy savings of up to 80%
  • Sustainable and carbon-neutral production and processes in our European factories
  • Full transparency of the pump's operating status via remote access to save resources compared to on-site assessments
Series description
Wilo-Stratos MAXO


Glandless smart circulator with oval flange and round flange connection and EC motor with integrated electronic power adjustment.


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

Max. Flow: 280 GPM

Max. Head: 52 feet


Field 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
  • Heat exchanger


  • Ceiling cooling
  • Underfloor cooling
  • Air-conditioning devices
  • 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)
  • Variable pitch of Δp-v pump curve

Manual settings

  • Selection of the field of application using the Setup Guide
  • Setting the related operating parameters
  • Nominal duty point: direct input of calculated duty point at Δp-v
  • Status display
  • Setting and resetting the energy meters (heating and cooling)
  • Pump venting function
  • Key lock for disabling the settings
  • Function for resetting the factory settings or the saved restoration points (parameter sets)
  • Parameterising the analogue inputs
  • Parameterising the binary inputs
  • Parameterising the relay outputs
  • Dual pump function (for 2 single pumps, which should be operated as twin-head pump)

Automatic functions

  • Power adjustment according to requirements for energy-efficient operation depending on the operating mode
  • Setback operation
  • Deactivation at zero flow (No-Flow Stop)
  • Soft start
  • Automatic troubleshooting routines (e.g. deblocking function)
  • Switchover heating/cooling mode
  • Full motor protection with integrated trip electronics

External control inputs and their functions

  • 2 x analogue inputs:
  • Signal types: 0 – 10 V, 2 – 10 V, 0 – 20 mA, 4 – 20 mA, PT1000
  • Applications: Remote adjustment of the setpoints in every control mode (except Multi-Flow Adaptation), sensor inputs for temperature, differential pressure or free sensor in user-defined PID-operating mode
  • 2 x digital inputs:
  • For potential-free control outputs or switch
  • Parametrizable functions:
    • Ext. Off
    • Ext. Min
    • Ext. Max
    • Key lock
    • Switchover between heating/cooling mode

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

Signal and display functions

  • Display status operation display:
    • Setpoint
    • Actual delivery head
    • Actual volume flow
    • Power consumption
    • Electric consumption
    • Temperatures
  • Status display LED: Faultless operation (green LED), pump communication (blue LED)
  • Display status of display fault (display red):
    • Error codes and error description in full text
    • Remedial measures
  • Display status of display warning (display yellow):
    • Warning codes and description of the warning in full text
    • Remedial measures
  • Display status process indicator (display blue):
    • Pump venting
    • Update procedure
  • Display BMS communication (display blue):
  • Summary of the active BMS parameters (baud rate, address,...)
  • 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).

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

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


  • 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 temperature sensor in the pump housing
  • Quick electrical connection with optimized Wilo-Connector including a ½ NPT connection adapter for the power supply



Stratos MAXO-D 3x3-40

Stratos MAXO

Pump designation

Single Pump


Double Pump


Single pump for drinking water circulation system


Flange Connection in inches

Continuously variable setpoint height 3 – 40 ft


Minimum delivery head 3.3 ft

Maximum delivery head 39.4 ft

Technical data

  • Permissible temperature range 14 °F (-10 °C) to 230 °F (+110 °C)
  • Mains connection:
    • 1~115 V, 50/60 Hz (depending on type),
    • 1~230 V-240 V, 50/60 Hz
  • Enclosure: Type 2
  • Flange connection: 1.25, 1.5, 2 and 3 inch
  • Max. operating pressure: 145 psi
  • Insulation class: F


  • Pump housing: grey cast iron with cataphoretic-coated
  • Thermal insulation: polypropylene
  • Shaft: Stainless steel
  • Bearing: carbon
  • Impeller: Plastic


  • Smart glandless circulator with EC motor and integrated electronic power adjustment
  • Green Button Technology and graphic display
  • Motor protection with trip electronics
  • Plug connection for functional extension with optional CIF module for building automation (BA)
  • Impeller with three-dimensionally curved blades and plastic sealing tube made of carbon fibre composite material

Scope of delivery

  • Pump
  • Optimized Wilo-Connector with ½ NPT connection adapter
  • 5x threaded cable gland M16 x 1.5
  • Gaskets for 1.25, 1.5 and 2 inch flange connections
  • Installation and operating instructions




  • PT1000 (B) pipe surface contact sensor (for domestic hot water)
  • PT1000 (AA) sensor for installation in immersion sleeve
  • Differential pressure sensor
  • CIF modules: Modbus RTU, BACnet MS/TP

Installation and operating instructions

Wilo-Stratos MAXO/-D/-Z

Article Number 2226402
Edition 2023-10
Number of pages 324
Language en, fr
PDF (6 MB)

General overview

Stratos MAXO/-D/-Z Engineering Specification

Number of pages 6
Language en
PDF (230 KB)

Smart Connect App - Software Update Process

Number of pages 5
Language en
PDF (747 KB)

Certification booklet

Stratos MAXO, Stratos MAXO-D, Stratos MAXO-Z, Stratos , Stratos-D, Stratos-Z, Stratos-ZD, Yonos MAXO,Yonos MAXO-D, Yonos MAXO-Z, Yonos ECO BMS, Yonos PARA HF, Stratos PARA, Stratos PARA-Z, TOP-Z, TOP-S Transportsysteme

Article Number 2209011
Edition 2022-11
Number of pages 72
Language language neutral
PDF (28 MB)

Release notes Software

Release notes Stratos MAXO

Article Number 2212705
Edition 2021-04
Number of pages 60
Language bg, cs, da, de, el, en, es, et, fi, fr, hr, hu, it, lt, lv, nl, no, pl, pt, ro, ru, sk, sl, sr, sv, tr, uk
PDF (4 MB)

Accessories sheet

Wilo Stratos MAXO CIF Modules - En, Fr, Es

Number of pages 34
Language en, es, fr
PDF (2 MB)


WILO USA UL Certification

Number of pages 2
Language en
PDF (382 KB)

Data sheet

Stratos MAXO Submittal

Number of pages 14
Language en
PDF (3 MB)

Reference sheet

Cross Reference - Magna3 vs MAXO

Number of pages 1
Language en
PDF (179 KB)

Cross Reference - Stratos vs MAXO

Number of pages 1
Language en
PDF (361 KB)
Product selection
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Pump connection
Mains connection
Port-to-port length in inch L0
6.4961 … 14.0157 in (")