Description
Reënstok is a modular rainwater harvesting tank that is installed on the facade of a building, replacing a traditional downspout. It captures rainwater before it reaches the sewer system and stores it for on-site reuse—watering balconies and gardens at the base of buildings, supplying toilets or washing machines in addition to the public water supply. Its modular design allows for increased capacity by adding modules, with no height limit up to the roof, and without the need for foundations or major construction work. It incorporates an automatic antifreeze purge to protect the system in winter. Winner of the Faire Paris 2018 award.
Rainwater management
Reënstok acts as a hydraulic buffer. During heavy rainfall, it absorbs excess water and prevents sewage treatment plants from overflowing. During dry periods, it ensures a steady flow into the sewerage network to maintain its proper functioning. It thus contributes to rainwater management at source, in line with the increasing requirements of local planning regulations (PLU).
Modular and adaptable system
The tank is installed directly on the building façade without the need for a foundation. Modules can be added one after the other to increase capacity as required by the building, right up to the roof. This flexibility makes it suitable for both apartment blocks and detached houses, in both new-build and renovation projects.
Funding and financial support
The collected water is reused directly on site, reducing the consumption of drinking water. For residents of the Île-de-France region, financial assistance is available via adaptaville.fr. You can also enquire at your local town hall or local authority. To discover other complementary solutions, browse our full range of Ekovore rainwater harvesting systems.
Technical characteristics
Vandal-proof
Frost-proof system
Lockable dispensing valve
Overflow protection with drain plug
Optimised floor space
Foundation-free mounting system
No height restrictions on equipment
Brushed stainless steel
FAQ
Frequently Asked Questions
What is Reënstok’s capacity?
A tank can hold up to 575 litres of rainwater. The total capacity depends on the number of modules installed. Each module is added vertically along the façade, with no height limit up to the roof. Contact us to discuss the specifications for your installation.
Reënstok nécessite-t-il des travaux importants pour l’installation ?
No. It is fitted to the façade to replace an existing downpipe, without the need for foundations or groundworks. It can therefore be installed in both renovation and new-build projects. The load-bearing capacity of the wall must be assessed before installation.
How is Reënstok protected against frost?
The system features an automatic anti-freeze drain that empties the tank when the temperature falls below a certain threshold, thereby protecting the modules and connections from damage caused by freezing in winter.
What is the collected water intended for?
Rainwater collected by Reënstok is suitable for all non-potable uses: watering balconies and gardens at the foot of the building, flushing toilets, running washing machines, and cleaning outdoor areas. It must not be consumed as drinking water without prior treatment.
What is the difference between Reënstok and ROSILUV?
The Reënstok is a facade-mounted tank that replaces a building’s downpipe — it therefore requires a connected roof. ROSILUV is a stand-alone collector with its own 4.3 m² catchment area, which can be installed on the ground or on a flat roof without requiring a downpipe. The two products are complementary, depending on the building’s layout.
Is Reënstok compliant with the requirements of the Local Planning Regulations regarding stormwater management?
Yes. It directly meets the requirements for on-site rainwater management set out in many local urban planning schemes (PLU(i)), by retaining water on site before it is discharged into the public drainage system. It is a suitable solution for urban regeneration or new-build projects subject to these requirements.
Has Reënstok been approved by the ABF (Architectes des Bâtiments de France)?
Yes. All existing installations have been submitted to the ABFs for approval and have been approved. Its understated, neutral design, together with its stainless steel tanks, allows it to blend harmoniously into the public space.
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