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3,200-Liter Underground Tank – Groundwater-Resistant Rainwater Cistern

A Groundwater-Safe Solution for Rainwater

The round underground tank made of polyethylene (PE-LLD) stores 3,200 liters of rainwater for garden irrigation, cleaning, and suitable household water uses. The design is intended for underground installation in groundwater and aquifers. The installation instructions must be followed.

Depending on your needs, the underground tank is available without accessories, with a pre-installed inlet flow regulator, with a tank-mounted filter featuring an inlet flow regulator, or with the Biovitor. The Biovitor enables biological water treatment without the use of chemicals and features integrated inlet flow regulation.

You can determine the appropriate tank size using our rainwater calculator.

Additional product features and benefits

  • Height-adjustable sliding dome—extendable by 200 mm and tiltable up to 5° to adapt to the ground level
  • Three pre-assembled connections—additional connection points allow for further connections on-site
  • Seamlessly manufactured—monolithic construction using a rotational sintering process with a stress-free tank body
  • Optimized tank structural integrity – beaded profile enhances the tank’s stability
  • PE-LLD and 100% recyclable – chemically inert material that does not affect the quality of the stored water
  • Safety cover – walkable and featuring a slip-resistant surface
  • Vehicle traffic capacity can be expanded – for areas accessible to cars and trucks with a suitable cover (cars, trucks) and in accordance with the installation instructions
  • 25-year warranty – provided the tank is installed properly in accordance with the installation instructions; the warranty certificate (DE) or the warranty certificate (EN) is available for download

Equipment Options

  • Without accessories – for customizing or expanding your system
  • With inlet stabilizer – stabilizes the water inflow and reduces turbulence in the tank
  • With in-tank filter and inlet stabilizer – for pre-filtering rainwater directly in the tank
  • With Biovitor – biological water treatment without the use of chemicals and integrated inlet flow stabilizer

Technical Specifications

Feature Value
Material Polyethylene (PE-LLD)
Volume 3,200 liters
Weight 200–210 kg, depending on accessories
Length 2,300 mm
Width 1,400 mm
Overall height 2,150–2,350 mm, extendable sliding dome
Connections 3 × DN 100 (Ø 110 mm) with rubber lip seals

Installation & Use

Delivery is made by a freight carrier, curbside. For information on the exact delivery process, see “Delivery Process .” The scope of delivery depends on the selected configuration and is listed in the “Scope of Delivery” tab.

Please follow the installation instructions and read all instructions carefully and in full before installation, connection, and commissioning. Safety and installation regulations must be observed to ensure proper installation and safe use.

Separate products are available for areas accessible to passenger cars and trucks (passenger car, truck). Follow the specifications in the installation instructions.

A warranty or guarantee claim may be void if the tank was not installed properly in accordance with the installation instructions and the defect is attributable to this improper installation. Check the system regularly for leaks, cleanliness, and stability. 

Material & Sustainability

The tank is made of polyethylene (PE-LLD) and is 100% recyclable. The material is chemically inert and has no effect on the quality of the stored water. The tank body, manufactured monolithically using a rotational sintering process, is seamless. The robust construction ensures long-term use and thus resource-efficient operation. GreenLife manufactures the underground tank in Germany. Learn more about sustainability at GreenLife.

Characteristic Value
Material Polyethylene (PE-LLD)
Volume 3,200 liters
Weight 200–210 kg, depending on the configuration
Length 2,300 mm
Width 1,400 mm
Overall height 2,150–2,350 mm, retractable sliding roof
Connections 3 × DN 100 (Ø 110 mm) with rubber lip seals
Groundwater stability For installation in groundwater and stratum water in accordance with the installation instructions
Vehicle traffic capacity With a cover suitable for passenger car traffic
Truck traffic capacity With kit for truck traffic
Backfill As per installation instructions
Recyclability 100%

Do You Have Any Questions? We’re Here to Help.

Our customer service team is happy to assist you with any questions regarding product selection, application, installation, or accessories.

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