WISY AG

What WISY AG does

WISY AG is a privately held German specialty manufacturer founded in 1989 and headquartered in Kefenrod-Hitzkirchen, Hessen, that designs and sells rainwater harvesting and filtration systems under a Made-in-Germany positioning. The company's core technology is a vertical stainless steel filter mesh (mesh sizes 0.28 mm–0.44 mm) used across three filter families — the Filtersammler FS downpipe filter, the Wirbel-Feinfilter (WFF 100/150/300) vortex fine filters for underground pipe installation, and the Zisternenfilter LineAr for cistern installation — which together implement WISY's documented 4-stage rainwater treatment process (filtering, quiet inlet, floating intake, overflow with odor trap). Around these filters, WISY has assembled a complete system portfolio including submersible and suction/pressure pumps, automatic switching units (Schaltautomat Zeta 02), underground cisterns and basement tanks (3,000–7,000 L), rain barrels, overflow siphons, separation stations, and pre-bundled Komplettsets for garden and household use.

The company operates as a direct-to-consumer e-commerce business selling through its multilingual wisy-water.com storefront (more than 20 supported languages, multiple currencies), complemented by an international partner/reseller program and professional consulting for rainwater system planning. Revenue is generated primarily from unit-priced hardware sales ranging from roughly €58 for small accessories to over €4,000 for high-capacity Regenwasserwerke (Sigma, Optima, Maxima), with larger commercial products (e.g., WFF 300) sold on a quote basis. Customer segments span residential homeowners, gardeners/entry-level buyers, commercial/industrial buildings, sports facilities, and industrial process-water users; reference projects include Maracanã Stadium, Google HQ New York, IKEA Rothenburg, and a rainwater project on the Greek island of Aegina. Products carry 5–10 year warranties, comply with DIN EN 12056/EN752 and DIN 1989, and the company employs approximately 5 people with no disclosed external funding.

Name

WISY AG

Legal name

WISY AG

Website

https://wisy-water.com

Company type

Private

Founded year

1989

Operating status

Operating

Headcount range

1–10 employees

Short description

WISY AG is a German manufacturer founded in 1989 that sells Made-in-Germany rainwater filtration and harvesting systems directly via e-commerce to residential, commercial, and industrial customers worldwide, anchored by proprietary vertical stainless steel filter mesh technology.

Ownership category

akta.pro rank

Product category

Rainwater Harvesting and Filtration Equipment

NAICS

Pump and Compressor Manufacturing (33391), Measuring, Dispensing, and Other Pumping Equipment Manufacturing (333914)

SIC

Pumps & Pumping Equipment (3561), Wholesale-Hardware & Plumbing & Heating Equipment & Supplies (5070)

akta.pro primary industry

Separation & Filtration Equipment (Filters, Centrifuges, Membranes) (IMAHAEAB)

akta.pro secondary industries

Water & Wastewater Treatment Plant Equipment (Clarifiers, Aeration, Membrane Systems) (IMAHAEAJ), Water Systems & Treatment (Pumps/Boilers/Water Heaters/Filtration) (IMAIABAK)

Keywords

• Rainwater filtration systems
• Rainwater harvesting equipment
• Vortex fine filters
• Cistern storage tanks
• Rainwater management units

Headquarters

HQ city

Kefenrod-Hitzkirchen

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B and B2C

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Personnel, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Product Sales (E-commerce): WISY AG generates revenue through direct product sales via their e-commerce website. Products include rainwater filters, pumps, cisterns, rainwater management units, and accessories. The company offers products ranging from €58 (floating switch for replenishment) to over €4,000 (Maxima rainwater management unit). Some commercial/industrial products require quote-based pricing.
2. Professional Consulting: WISY provides professional consulting services for rainwater system planning, helping customers select appropriate filters, storage, and system components for their projects.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels6 records

Core offering

WISY AG manufactures and sells rainwater filtration and harvesting systems built around its proprietary vertical stainless steel filter mesh technology. The product range spans downpipe filters (Filtersammler FS), vortex fine filters (WFF 100/150/300 series), cistern filters (LineAr 100), rainwater management units (Regenwasserwerke Multimat/Sigma/Optima/Optima Plus/Maxima), submersible and suction pumps, storage tanks, rain barrels, and complete bundled systems for residential and commercial applications.

Product overview

WISY AG is a German manufacturer specializing in rainwater harvesting and filtration systems with a modular product portfolio centered on their 4-stage filtration system. The core offering consists of three filter types (Filtersammler FS for downpipes, Wirbel-Feinfilter WFF series for underground installation, and Zisternenfilter LineAr for cistern installation), complemented by Regenwasserwerke (Sigma, Optima, Maxima) that manage water distribution and automatic mains water switching, Regenwasserpumpen for water extraction, and comprehensive accessories including floating suction filters, overflow siphons, and storage tanks. The systems are designed for both residential (single/two-family homes) and commercial applications (sports facilities, large buildings), with the largest WFF 300 filter handling up to 3,000 m² roof areas. Products are manufactured in Germany with a focus on self-cleaning, low-maintenance stainless steel filter technology and are complemented by a 5-10 year warranty.

Differentiator

Problem solved

Functional benefit

Products and services

• Filtersammler FS (Filter Collector / Downpipe Filter)
• Wirbel-Feinfilter WFF 100 (Vortex Fine Filter 100)
• Wirbel-Feinfilter WFF 150 (Vortex Fine Filter 150)
• Wirbel-Feinfilter WFF 300 (Large-Scale Vortex Fine Filter)
• Zisternenfilter LineAr 100 (Cistern Filter)
• Regenwasserwerke (Multimat, Sigma, Optima, Optima Plus, Maxima) - Rainwater Management Units
• Regenwasserpumpen (Multigo, AspriPlus, Provedo, Beta) - Rainwater Pumps
• Ansaugfilter (Suction Filters - Fine and Coarse)
• Schaltautomat Zeta 02 (Pump Switching Automatic)
• Regentonne Stabilix (Rain Barrel)
• Regenwasser-Zisternen & Kellertanks (Underground Cisterns and Basement Tanks)
• Trennstationen & Trinkwasser-Nachspeisung (Separation Stations and Mains Water Top-up)
• Überlaufsiphon DN 110 / DN 200 (Overflow Siphon)
• Komplettsets (Complete Rainwater Harvesting System Bundles)

Quantifiable outcome

• Water yield >90% at 1.4 l/min (LineAr 100)
• +3 more outcomes

Named customers4 records

Segments4 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Scale indicators3 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• ACO Group: Large European water-management group covering surface drainage, stormwater treatment, and rainwater systems. Overlaps with WISY in rainwater harvesting but operates as a broad portfolio incumbent rather than a niche specialist.
• Xylem Inc. Large global water technology company spanning pumps, filtration, and treatment infrastructure. Adjacent to WISY in filtration and pump categories but operates at utility/municipal scale rather than residential rainwater.
• Kingspan Water & Energy: Global provider of rainwater harvesting, stormwater management, and hot water solutions under the Kingspan group. Competes with WISY on commercial-scale rainwater systems with significantly broader geographic and product reach.
• Premier Tech Water and Environment: International water and environmental solutions provider offering rainwater harvesting, septic, and stormwater products. Overlaps with WISY's commercial-scale projects and competes for architect/specifier mind share.
• Culligan International: Established water treatment company offering filtration, softening, and reuse products for residential and commercial customers. Overlaps with WISY in household water treatment but with much broader product and geographic scope.
• Watts Water Technologies: Global manufacturer of water-related products including plumbing, filtration, and water reuse systems. Competes at the broader level in water treatment and pumps rather than as a pure-play rainwater specialist.

Direct peers

• Otto Graf GmbH (GRAF): German manufacturer of rainwater harvesting systems, cisterns, and stormwater management products. Directly competes with WISY across residential and commercial rainwater storage and filter categories in the DACH region.
• 3P Technik Filtersysteme GmbH: Germany-based specialist in rainwater filters, cistern filters, and overflow siphons. Already a WISY supplier partner but also an overlapping competitor selling similar vortex/cistern filter technology.
• Rewatec: European manufacturer of rainwater storage tanks and complete rainwater harvesting systems, competing head-to-head with WISY's cistern and Komplettset offerings, particularly in residential and small commercial segments.

Regional players

• Rain Harvesting Pty Ltd: Australian rainwater harvesting specialist focused on residential and commercial tank systems, filters, and first-flush diverters. Comparable product category to WISY but operating primarily in the Australian/NZ market.

Market position

Strengths5 records

Weaknesses4 records

Competitive moat3 records

Key risks5 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/wisy-ag

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about WISY AG