What is the advantage of a grinder pump over a standard sewage pump?

Grinder pumps like the Wilo Rexa S use a macerator to chop solids including wet wipes and hygiene items before pumping. This prevents clogging, reduces maintenance, and allows use of smaller diameter pipes (DN 32/40) compared to conventional sewage pumps that require larger free passage.

Can the Wilo Rexa PRO-S be used in hazardous areas?

Yes. The PRO-S comes with standard ATEX approval for Zone 1 and Zone 2 explosive atmospheres, making it suitable for industrial applications where flammable gases or vapours may be present.

What happens if the pump runs without being submerged in liquid?

All three models support non-immersed operation for limited durations—MINI3-S at S3-20%, FIT-S for up to 15 minutes (S2), and PRO-S for up to 30 minutes (S2). The corrosion-resistant motor housing protects the pump during these conditions.

Which model is suitable for a multi-storey apartment building?

The Wilo Rexa FIT-S is designed for apartment buildings and commercial complexes, offering delivery heads up to 40 metres (approximately 8 floors). For larger complexes or continuous-duty municipal applications, the PRO-S is recommended.

What maintenance is required for the macerator?

The macerator is made from hardened martensitic chrome steel (59 HRC) for extended wear life. Routine inspection of the sealing chamber (optional monitoring available on FIT-S and PRO-S) and periodic checks of mechanical seals are recommended as per the manufacturer's maintenance schedule.

WILO MATHER & PLATT · PUMPS

Wilo Rexa S Grinder Pumps – Submersible Sewage Pumps with Macerator

Name: Wilo Rexa S Grinder Pumps – Submersible Sewage Pumps with Macerator
Brand: Wilo Mather & Platt

Wilo Rexa S grinder pumps for pressure drainage. MINI3-S, FIT-S & PRO-S models. Non-clogging macerator technology. Available at PC Engineering India.

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Overview

The Wilo Rexa S series comprises submersible sewage pumps equipped with radial macerator technology, designed specifically for pressure drainage applications where conventional pumps face clogging issues. These grinder pumps address the increasing challenge of solids in sewage systems caused by reduced water consumption and disposal of hygiene items like wet wipes.

The series includes three models—MINI3-S, FIT-S, and PRO-S—each engineered for different application scales, from single-family homes to municipal and industrial installations. All models feature a hardened macerator made of martensitic chrome steel (1.4528-59 HRC) that chops solids at 24 m/s, ensuring non-clogging operation and reliable pressure drainage.

The optimised hydraulic/macerator combination delivers higher delivery heads with lower energy consumption, while compatibility with small-diameter pipework (DN 32/40) reduces installation costs significantly. All pumps comply with DIN EN 12050-1 for pressure drainage systems.

Key Features

Radial macerator with double shear effect for reliable solids chopping
Hardened stainless martensitic chrome steel macerator (1.4528-59 HRC)
Macerator tip speed of 24 m/s for effective grinding
Compact DN 32/40 discharge connection reduces piping costs
Double mechanical seal for motor protection
Optional sealing chamber monitoring (FIT-S and PRO-S)
Corrosion-resistant construction (stainless steel or grey cast iron housing)
ATEX approval for Zone 1 and Zone 2 (PRO-S model)
Float switch versions available for automatic level-dependent control

Specifications

Parameter	Wilo-Rexa MINI3-S	Wilo-Rexa FIT-S	Wilo-Rexa PRO-S
Discharge Port	DN 32/40	DN 32/40	DN 32/40
Max. Delivery Head	~20 m (5 floors)	~40 m (8 floors)	~40 m
Max. Power (1~230V, 50Hz)	0.75 kW	1.5 kW	1.5 kW
Max. Power (3~400V, 50Hz)	0.75 kW	2.5 kW	3.9 kW
Weight	17 kg	35–50 kg	45–65 kg
Motor Housing	Stainless steel	Stainless steel	Grey cast iron
Immersed Operating Mode	S1 (continuous)	S1 (continuous)	S1 (continuous)
Non-Immersed Operating Mode	S3-20%	S2-15 min	S2-30 min
ATEX Approval	No	No	Zone 1 & 2 (standard)
Mechanical Seals	Double seal	Double seal	Double seal
Standards	DIN EN 12050-1	DIN EN 12050-1	DIN EN 12050-1

Applications

- Residential: Cesspools, collector tanks, and pump shafts for single and two-family houses (MINI3-S) - Commercial Buildings: Pressure drainage for apartment complexes, office buildings, and public toilets (FIT-S) - Municipal Infrastructure: Railway stations, sewage pumping stations, and public utilities (PRO-S) - Industrial Facilities: Manufacturing plants, process drainage, and building complexes requiring continuous operation (PRO-S) - Hazardous Areas: Applications in potentially explosive atmospheres (PRO-S with ATEX certification)

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