The Wilo TOP-S is a high-performance glandless (canned-rotor) circulation pump designed for circulation systems. It utilizes an advanced glandless structure to effectively prevent fluid leakage and minimize wear, ensuring stable operation in high-pressure or high-temperature environments. Key features include an energy-efficient design—achieved through optimized flow paths and motor technology—that significantly lowers power consumption; this makes it ideal for heating or cooling systems requiring continuous operation, thereby helping users reduce operating costs. Its operational stability is exceptional, thanks to a robust mechanical structure and glandless technology, ensuring a low failure rate even under continuous duty and extending the equipment's service life. Quiet operation is another major highlight; the pump runs with minimal noise, making it particularly suitable for noise-sensitive environments such as residences and office buildings, thereby enhancing overall comfort.
Regarding control, the Wilo TOP-S offers flexible operating modes, supporting both manual and automatic functions. Precise adjustment of flow and pressure is achieved via speed-stage switching (e.g., two speed levels), allowing users to tailor performance to actual needs. The pump is equipped with comprehensive safety mechanisms, including an internal temperature monitoring system that automatically detects and warns of faults such as winding short circuits, overloads, or overheating, preventing equipment damage. Additional features—such as potential-free normally closed contacts and a rotation direction indicator—enhance system reliability and ease of use, reducing maintenance requirements, especially in industrial applications. A wide range of models covers various flow rate and head specifications, ensuring broad applicability across scenarios ranging from domestic water supply to industrial circulation systems.
Its application scope is extensive, covering hot water heating systems (such as underfloor heating or radiator circuits), central air conditioning cooling loops, industrial equipment (such as low-temperature cooling for freeze-dryers), and solar hot water systems; the glandless design handles various media and boosts overall system efficiency. Furthermore, accessories such as rubber vibration dampers or connectors can further mitigate vibration and protect pipe connections, though selection should be customized based on the specific environment to optimize vibration dampening. In summary, the Wilo TOP-S series—characterized by efficiency, quiet operation, and durability—serves as a reliable water circulation solution for both the building services and industrial sectors.
Structure
Glandless circulation pump with threaded or flanged connections. Direction of rotation indicator light (only for 3-phase AC models)
Manual power adjustment with 3 speed stages
Cathodic dip coating (KTL) on the pump housing protects against corrosion caused by condensate formation
Applications
Various hot-water heating systems, industrial circulation systems, air-conditioning systems, and closed cooling circuits
Equipment/Functions
Operating modes
Speed stage switching
Manual functions
Speed stage setting: 3 speed stages (2 speed stages for single-phase pumps with P2 ≥ 350 W)
Automatic functions
Internal protection against impermissible winding temperatures (only for pumps with P2 ≤ 180 W)
Signaling and display functions
Thermal winding contact (WSK, potential-free NC contact) (only for pumps with P2 ≥ 180 W); enables full motor protection at all speed stages when used with optional SK 602N/SK 622N relay
Direction of rotation indicator light (only for 3-phase pumps)
Display of selected speed stage
Dual pump management (twin-head pump or 2 x single pumps)
Main/standby operation or parallel operation (appropriate control switchgear must be provided on-site for automatic fault-actuated switchover/time-controlled pump cycling)
Equipment
Flange-end pumps: Flange versions
Standard version for DN 40 to DN 65 pumps: PN 6/10 combination flange (PN 16 flange according to EN 1092-2) for PN 6 and PN 16 counter-flanges,
Standard version for DN 80/DN 100 pumps: PN 6 flange (designed for PN 16 flange according to EN 1092-2) for PN 6 counter-flanges
Cable entry from both sides (only for single-phase and 3-phase pumps with P2 ≥ 180 W)
Standard thermal insulation for heating applications
Type key
|
Example: |
TOP-S 40/10 |
|
TOP-S |
Standard pump (screw pump or flanged-end water pump) |
|
40/ |
Nominal connection diameter |
|
10 |
At Q = 0 m³/h, nominal head [m] |
Technical data
Permissible temperature range: -20°C to +130°C; up to +140°C for short periods (2 hours) (TOP-S 25/13, 80/15, 80/20: -20°C to +110°C)
Mains connection:
1~230 V, 50 Hz (depending on model)
3~230 V, 50 Hz (with optional switching plug)
3~400 V, 50 Hz
Protection class: IPX4D
Threaded or flanged connection (depending on model): Rp 1 to DN 100
Max. operating pressure for standard models: 6/10 bar or 6 bar (special models: 10 bar)
Materials
Pump housing: Grey cast iron
Impeller: Plastic
Shaft: Stainless steel
Bearing: Carbon, metal-impregnated
Scope of delivery
Pump
Thermal insulation
Gaskets for threaded connections
Gaskets for flanged connections (for nominal connection diameters DN 40 – DN 65)
Installation and operating instructions
Options
Special voltage models available on request.
Accessories
Screw connections for threaded connections
Counter-flanges for flanged connections
Adapter fittings
Wilo-SK 602N/SK 622N relays for comprehensive motor protection
For 3~400 V pumps:
Switching plug for 3~230 V, 50 Hz (not for TOP-S 80/15, TOP-S 80/20)
