Wilo-Stratos MAXO Glandless EC Circulator Pump
Overview
The Wilo-Stratos MAXO is a high-efficiency glandless in-line circulator pump built around an integrated permanent-magnet EC motor and an intelligent electronic control module. Designed for heating, air-conditioning, and chilled water circulation in commercial and residential building services, the Stratos MAXO automatically adapts its performance to the actual demand of the hydraulic system through the Wilo Dynamic Adapt plus algorithm, eliminating manual balancing and cutting electricity consumption by up to 20% compared to conventional constant-pressure control. A backlit graphic display with a rotary red button gives installers and facility engineers a clear, menu-driven interface for setup, diagnostics, and performance monitoring, while an ultra-low energy efficiency index (EEI ≤ 0.17–0.19 depending on variant) keeps the pump comfortably ahead of European ecodesign requirements.
With fast quotation turnaround and technical support, Seven Star LLC proudly supplies genuine Wilo-Stratos MAXO circulator pumps to MEP contractors, facility management companies, and district cooling operators across Oman and the wider GCC. Buyers in Muscat, Sohar, and Salalah rely on Seven Star LLC not only for the hardware and manufacturer documentation, but also for local technical support with hydraulic sizing and BMS integration.
Operating Principle
Like all Wilo glandless circulators, the Stratos MAXO uses a wet-rotor design in which the rotor and impeller are immersed directly in the pumped medium, eliminating the mechanical shaft seal that is the most common failure point in conventional circulators. The permanent-magnet synchronous EC motor drives the impeller with significantly higher efficiency than older asynchronous designs, and the electronic module continuously measures differential pressure and flow to calculate the optimum operating point in real time. Rather than requiring the installer to select a fixed pressure setpoint, Dynamic Adapt plus learns the system’s characteristic curve and automatically follows the lowest possible pressure that still satisfies every terminal unit in the circuit.
This self-adapting behaviour has direct practical consequences for the buildings it serves: flow noise at thermostatic valves is reduced, differential pressure across the distribution network stays stable as zones open and close, and the pump continuously re-optimizes itself as the system ages or is modified, without requiring a technician to revisit the setpoint. The wet-rotor construction also means zero shaft seal leakage risk and near-silent operation, both valued in hospital wards, hotel plant rooms, and occupied office ceiling voids where mechanical noise and water damage are unacceptable.
Engineering Design of the Wilo-Stratos MAXO
Physically, the Stratos MAXO integrates the pump body, EC motor, and electronics module into a single compact in-line unit that can be installed directly into the pipework in any orientation, horizontal or vertical, without a separate control cabinet. The stainless-steel pump shaft and ceramic radial bearings are engineered for continuous 24/7 duty, while the cast-iron or stainless-steel (depending on model) pump housing is rated for typical heating and chilled-water system pressures. The electronics housing rotates independently of the pump body, so the display always remains legible regardless of pipe orientation.
Communication is a strong point of the range: depending on variant, the Stratos MAXO supports Wilo Net, Modbus RTU, BACnet MS/TP, LON, or an analogue 0–10V interface, allowing direct integration with building management and SCADA systems for centralized monitoring, scheduling, and energy reporting. Twin-head variants (Stratos MAXO-D) provide automatic duty/standby changeover and alternation for critical applications, while the single-head model is the standard choice for zone circulation, boiler primary loops, and secondary chilled-water distribution.
Key Features
Selecting the Wilo-Stratos MAXO gives facility engineers a circulator that combines proven wet-rotor reliability with modern digital control, simple to commission and economical to run. The Wilo-Stratos MAXO range is engineered for continuous duty in demanding building services applications:
- Integrated permanent-magnet EC motor delivers high hydraulic efficiency across the entire operating range, reducing electricity consumption compared to conventional circulators.
- Wilo Dynamic Adapt plus automatically learns the system curve and continuously adjusts pump performance without manual setpoint entry.
- Backlit graphic display with an intuitive rotary red button simplifies commissioning, diagnostics, and performance readouts.
- Multiple control modes are available, including constant pressure, variable pressure, constant speed, and PID control for special applications.
- Wet-rotor construction eliminates the mechanical shaft seal, removing the most common source of circulator leakage and maintenance.
- Native fieldbus options, including Modbus RTU, BACnet MS/TP, LON, and Wilo Net, support seamless integration with BMS and SCADA platforms.
- Energy efficiency index as low as EEI ≤ 0.17 keeps the pump well within European ecodesign requirements and lowers lifecycle operating cost.
- Compact in-line body installs directly into the pipework in any orientation, with a rotatable electronics head for legible display access.
- The Wilo-Stratos MAXO’s twin-head variant, Stratos MAXO-D, provides automatic duty/standby alternation for critical continuous-duty circuits.
Industrial Applications
The Wilo-Stratos MAXO is deployed extensively, and the Wilo-Stratos MAXO’s self-adapting control is deployed extensively across commercial and institutional building services, including heating and chilled-water circulation in high-rise towers, hospitals, hotels, shopping malls, and university campuses. Its ability to self-optimize against a changing hydraulic load makes it particularly effective in variable-demand systems such as fan coil networks, air handling unit coils, and district cooling substations, where terminal units open and close continuously throughout the day and conventional fixed-curve pumps waste significant energy running at unnecessarily high pressure.
With engineering support in Muscat, Seven Star LLC supplies the Stratos MAXO range to MEP consultants and facility operators throughout Oman and the GCC, supporting projects in Muscat’s commercial towers, Sohar’s industrial and desalination-linked developments, and Salalah’s hospitality and free-zone facilities. In a region where high ambient temperatures push HVAC systems into near-continuous operation, the pump’s low-energy design and robust wet-rotor construction translate directly into lower utility costs and fewer unplanned service visits for building owners.
Technical Specifications
The table below lists representative Wilo-Stratos MAXO technical data for the Wilo-Stratos MAXO 32/0,5-12 variant is summarized below; other pipe sizes and head ranges are available on request.
| Parameter | Specification |
|---|---|
| Model | Wilo-Stratos MAXO 32/0,5-12 |
| Pump Type | Glandless in-line circulator, wet-rotor EC motor |
| Connection Size | DN32, port-to-port distance 220 mm |
| Maximum Flow Rate | Approx. 15.0 m³/h |
| Maximum Delivery Head | 12 m |
| Power Consumption Range | 7–320 W (230V, 1~) |
| Nominal Pressure Rating | PN 6/10 (PN16 variant available) |
| Energy Efficiency Index (EEI) | ≤ 0.17–0.19 depending on model |
| Media Compatibility | Heating water, chilled water, water/glycol mixtures |
| Control Modes | Dynamic Adapt plus, constant pressure, variable pressure, constant speed, PID |
| Communication Interfaces | Modbus RTU, BACnet MS/TP, LON, Wilo Net, 0–10V (variant dependent) |
| Housing Material | Cast iron / stainless steel (model dependent) |
| Ambient Operating Temperature | 0°C to +40°C |
Request a Quote for Wilo-Stratos MAXO Glandless EC Circulator Pump
Facility engineers, MEP contractors, and procurement teams across Oman and the GCC can request a formal Wilo-Stratos MAXO RFQ directly from Seven Star LLC. We supply project sites in Sohar, Salalah, and across the Sultanate with lead time confirmed at quotation, and our instrumentation and pumps division provides full technical datasheets, hydraulic sizing support, and technical assistance on request. Backed by genuine manufacturer documentation, Seven Star LLC guarantees genuine manufacturer hardware, full warranty coverage, and dedicated after-sales support — contact our team today to receive a quotation tailored to your project.
Related Products
- Instruction Manual Wilo-Stratos MAXO Glandless EC Circulator Pump Manual Download
Wilo pump series listed here
The Wilo-Helix V is a vertical multistage centrifugal pump with stainless steel wetted parts and in-line connections, used where pressure has to be raised: water supply and pressure boosting, washing systems, closed cooling circuits and industrial circulation. The Wilo-Stratos MAXO is a glandless circulator with an electronically commutated motor and built-in control functions for heating, air conditioning and cooling circuits. It is also made as a twin-head version (MAXO-D) and as a drinking water version (MAXO-Z).Ordering Wilo pumps: what we need
For a replacement, send the full type key and article number from the pump nameplate, plus the motor data plate for a Helix V. For a new selection we need the duty point (flow and head), fluid and temperature, system pressure, connection size and pressure rating, and the electrical supply. For a Stratos MAXO, also state whether a communication module for the building management system is required. We supply to projects across the GCC and check each type key against Wilo documentation.Browse WILO products by category: Pumps.
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