Bottom line: what is Wilo-Sky-52
Brand & product positioning
Wilo (威乐) is a German manufacturer of pumps and intelligent water-management systems, focused on building and industrial water supply, HVAC circulation and drainage. The Wilo-Sky series is an automatic water supply / pressure boosting unit for water tanks (Application: "Automatic water supply/pressure boosting from water tank"). This page focuses on the single configuration Wilo-Sky-52 (Article No. 9253631), targeting the exact-model + article-number search intent so engineers and buyers can locate the technical data quickly.
Key specifications (verbatim from official datasheet)
| Item | Wilo-Sky-52 |
|---|---|
| Full model | Wilo-Sky-52 |
| Product type | Automatic water supply / pressure boosting unit |
| Article number | 9253631 |
| Mains connection | 1~220 V, 50 Hz (voltage tolerance ±10 %) |
| Connection (suction / discharge) | DN25 (suction / discharge pipe connection G 1) |
| Fluid temperature | 5 – 70 °C |
| Ambient temperature | -10 – 40 °C |
| Max. operating pressure (PN) | 8 bar |
| Protection class | IPX5 |
| Insulation class | F |
| Rated speed (n) | 5000 1/min |
| Rated current (I_N) | 4.4 A |
| Materials | Pump housing: Stainless steel; Impeller: PPO-GF30; Shaft: Stainless steel; Shaft seal: on request |
| Weight | Net 6.7 kg; Gross 5.7 kg |
| Packaging | Carton box L354 × W118 × H152 mm; with pack L465 × W175 × H215 mm; 45 pcs/pallet |
| Colour | black / silver |
| Min. order qty | 1 |
| Sales availability | 2025-07-28 |
| Pump curve medium | Water 100 %, 20.00 °C |
| Type key | Suffix "52" = Max-head code (datasheet gives no specific head value) |
Note: Only items explicitly given in the official Wilo datasheet are listed. The datasheet does not provide a numeric rated flow (m³/h), a numeric head (m), or a power rating in kW (only rated current and speed are given); the certification bodies are not listed either (only IPX5 and insulation class F are stated). These fields are intentionally left unlisted to avoid any fabrication. The type-key suffix 52 is described in the datasheet as a "Max head" code, but no specific head value is published.
Product features
- Complete automatic pressure-boosting unit — not a bare pump: integrates permanent-magnet water-cooled motor, pump, controller, flow switch and pressure sensor for fully automatic operation.
- Flow switch on the pressure side provides automatic operation and dry-running protection.
- Pump housing in stainless steel; impeller in PPO-GF30; shaft in stainless steel (shaft seal on request).
- Multiple built-in protections: multi-mode protection, water-temperature protection, controller over-temperature protection, dry-running (water-shortage) protection, inspection (patrol) protection and anti-freeze protection.
Application
- Automatic water supply and pressure boosting from a water tank in residential / light-commercial settings; suitable for clean water. Concrete selection and configuration should follow the official Wilo datasheet.