The Wilo Star-RS canned rotor circulation pump utilizes advanced canned rotor technology to effectively minimize the risk of fluid leakage and ensure stable operation in high-temperature or high-pressure environments; it is suitable for HVAC systems, underfloor heating, hot water circulation, and industrial cooling systems.
Key features include a three-speed adjustable function with power ratings of 46W (flow rate 1.5 m³/h), 67W (flow rate 2.46 m³/h), and 93W (flow rate 3.42 m³/h), and a maximum head of 6 meters, allowing users to flexibly adjust settings to optimize energy consumption.
Thanks to its optimized mechanical design and canned rotor structure, the pump operates with minimal noise, providing an ultra-quiet experience that does not disturb daily life or work environments.
The pump body undergoes special anti-corrosion treatment, and all wetted parts offer high corrosion resistance, significantly extending service life and reducing maintenance requirements.
Installation is highly convenient: the terminal box supports wiring from either side and can be rotated to four different positions, while the pump body orientation can be adjusted via diagonal screws to suit various spatial layouts. However, the pump shaft must be installed parallel to the horizontal plane to avoid tilted operation. Additionally, the vent plug design simplifies routine maintenance, allowing for quick air purging without disassembly; meanwhile, its high energy efficiency can reduce overall system energy consumption by over 30%, enhancing operational cost-effectiveness.
Compatible rubber vibration dampers or connectors effectively absorb vibration, reducing pipeline shock and noise while further enhancing system stability. With its compact structure, the pump is suitable for both commercial and residential applications—such as hot water heating, air conditioning circulation, and chemical fluid transport—delivering the reliability associated with German engineering.
Construction
Canned rotor circulation pump with threaded connection. Selectable speed stages for power adjustment
Suitable for any horizontal-shaft installation position; terminal box can be positioned at 3, 6, 9, or 12 o'clock
Three selectable speed stages for load adjustment
Easy and safe installation thanks to wrench attachment points on the pump housing
Simplified electrical installation due to removable, dual-entry threaded cable gland and spring-clip quick connector
Applications
Various hot-water heating systems, industrial circulation systems, cold-water systems, and air-conditioning systems
Equipment/Functions
Operating modes
Speed stage switching
Manual functions
Speed stage setting (3 speed stages)
Equipment
Wrench attachment points on the pump housing
Dual-sided cable entry
Quick connector with spring clip
Blockage-proof motor
Model code
|
Example: |
Wilo-Star-RS 25/4 |
|
Star-RS |
Standard Pump (Screw Pump) |
|
25/ |
Nominal connection diameter Rp |
|
4 |
At Q = 0 m³/h, nominal head [m] |
Technical data
Permissible temperature range: -10 °C to +110 °C
Mains connection: 1~230 V, 50 Hz
Protection class: IP44
Threaded connection: Rp ½, Rp 1, or Rp 1¼
Max. operating pressure: 10 bar
Materials
Pump housing: Grey cast iron
Impeller: Plastic
Shaft: Stainless steel
Bearing: Carbon, metal-impregnated
Scope of delivery
Pump
Seals for threaded connection
Installation and operating instructions
Options
...-130 model with shorter installation length (130 mm)
Accessories
Screw connections
Adapter fittings
Thermal insulation shell
