Wilo Wilo Stratos MAXO
Wilo smart glandless circulation pumps for heating, air conditioning and cooling, with connections from Rp 1 to DN 100.
Stratos MAXO is the Wilo series of smart, glandless circulation pumps for hot water heating, air conditioning, cooling and chilled water circulation, closed industrial circulation systems, and solar and geothermal installations. The series has three designs: Stratos MAXO (single pump), Stratos MAXO-D (twin pump) and Stratos MAXO-Z (single pump for domestic hot water recirculation). The supply is single-phase, 1~230 V, 50/60 Hz, and the EEI energy efficiency index is between ≤ 0.17 and ≤ 0.19, depending on the type.
The type code is read as follows: in Stratos MAXO-D 32/0,5-12, “-D” indicates the twin pump, “32” the DN 32 flange connection, and “0.5-12” the continuous adjustment range of the head, from 0.5 m to 12 m (at zero flow). Threaded connections have the code 25 (Rp 1) or 30 (Rp 1¼), and flanged ones range from DN 32 to DN 100; the PN suffix shows the nominal pressure of the variant. For a quotation, please send us the full code from the nameplate; when the item is available locally or at the supplier, delivery takes 24–72 h, and on order usually 1–4 weeks.
Models and codes
| Code | Note |
|---|---|
| Stratos MAXO 25/0,5-4 PN 10 | Single pump, Rp 1 (DN 25) threaded connection, adjustable head 0.5–4 m, PN 10. |
| Stratos MAXO 25/0,5-12 PN 16 | Single pump, Rp 1 threaded connection, adjustable head 0.5–12 m, PN 16. |
| Stratos MAXO 30/0,5-14 PN 10 | Single pump, Rp 1¼ threaded connection, adjustable head 0.5–14 m, PN 10. |
| Stratos MAXO 32/0,5-16 PN 16 | Single pump with DN 32 flange, adjustable head 0.5–16 m, PN 16. |
| Stratos MAXO 40/0,5-8 PN6/10 | Single pump with DN 40 flange, adjustable head 0.5–8 m, PN 6/10. |
| Stratos MAXO-D 32/0,5-12 PN 6/10 | Twin pump with DN 32 flange, adjustable head 0.5–12 m, PN 6/10. |
| Stratos MAXO-D 50/0,5-8 PN 6/10 | Twin pump with DN 50 flange, adjustable head 0.5–8 m, PN 6/10. |
Key specifications
| Designs | Stratos MAXO (single), Stratos MAXO-D (twin), Stratos MAXO-Z (domestic hot water) |
|---|---|
| Connections | threaded Rp 1 and Rp 1¼; flanged DN 32 – DN 100 |
| Fluid temperature (heating, air conditioning, cooling) | -10…+110 °C |
| Fluid temperature (drinking water, Stratos MAXO-Z) | 0…+80 °C |
| Ambient temperature | -10…+40 °C (0…+40 °C for Stratos MAXO-Z) |
| Maximum operating pressure | PN 6/10 (standard version), PN 16 (special version) |
| Power supply | 1~230 V ±10 %, 50/60 Hz |
| Protection class | IPX4D |
The Wilo-Stratos MAXO/-D/-Z installation and operating instructions are the 04/2025-10 edition, and the variants of the series appear in the current Wilo technical documentation, with no withdrawal notice.
Frequently asked questions
What fluids can a Stratos MAXO pump handle?
Stratos MAXO and MAXO-D handle heating water according to VDI 2035, demineralised water, water-glycol mixtures up to a 1:1 ratio (with the pumping data corrected for viscosity) and ethylene or propylene glycol with corrosion inhibitors; they are not suitable for drinking water, for which Wilo provides the MAXO-Z design. The pumps do not meet ATEX requirements and are not used for explosive or highly flammable fluids.
How do Stratos MAXO, MAXO-D and MAXO-Z differ?
Stratos MAXO is the single pump, MAXO-D is the twin pump, and MAXO-Z is the single pump intended for domestic hot water recirculation. The suitable design follows from the code of the existing pump or from the type of installation.
What data do you need for a replacement Stratos MAXO pump?
The full code from the nameplate (for example Stratos MAXO 32/0,5-12 PN 6/10), the Wilo article number, if visible, and the type of installation: heating, cooling or domestic hot water. We check the connection and the nominal pressure in the Wilo documentation before sending the quotation.
Other Wilo series
We do not carry out hydraulic balancing of the installation and we do not adjust the pump on site; we confirm the code, the connection and the nominal pressure from the Wilo documentation.
Updated: 2026-11-12