Regenwassertanks – oberirdisch, unterirdisch
Rainwater tanks – Sustainable and cost-effective garden water management
Collecting and efficiently utilizing rainwater is a vital step toward modern, eco-friendly water management and major household savings. Our range features advanced residential retention systems – from stylish above-ground column towers like the Water tank for garden 500l and larger versions like the Water tank for garden 1000l, up to the highly innovative underground shallow cistern Water tank FLAT 3000l. These smart systems allow you to accumulate ample soft rainwater, perfect for nourishing your lawn and garden beds.
All residential tanks in our distribution are manufactured from high-density polyethylene (HDPE) through monolithic rotational molding (rotomolding). This manufacturing standard guarantees 100% watertight performance due to the complete lack of seams, joints, or welds. The polymer is fully frost-proof, easily absorbing ground-freezing expansion forces, while high UV-stabilization keeps light out, preventing algae growth inside and protecting the structural integrity of the plastic from sunlight degradation.
Above-ground Aquatower column systems and low-profile FLAT underground cisterns
Choosing the perfect water storage depends on your property layout and aesthetic preferences. The low-profile FLAT 3000-liter underground tank is designed for discreet, space-saving water harvesting. Its flat geometry cuts excavation depth by up to 60% compared to traditional cylindrical cisterns, which significantly reduces excavation costs and enables installation in tough, stony terrains or high groundwater tables. On the other hand, the Aquatower above-ground tanks represent the peak of elegance and functionality – their vertical footprint saves space along house walls, and their clean, contemporary design complements modern homes beautifully.
Advantages of Rainwater Retention Systems – Why choose Sorfan?
- Substantial Mains Water Savings: Using rain runoff for garden irrigation can reduce your monthly water bills by up to 50%.
- Monolithic HDPE Durability: Rotational molding in the EU guarantees total watertightness and resistance to impact cracking.
- Biological Safeguards: UV-stabilized polymer shields the stored water from sunlight, halting algae reproduction inside.
- Easy Installation: The flat profile of FLAT cisterns minimizes earthworks, and Aquatower models feature built-in brass threads for easy tap connections.
Expert opinion – choosing and operating rainwater systems
Precipitation is naturally soft, free from lime and chlorine compounds, making it incomparably healthier for your plants than treated municipal water. As a water-management expert at Sorfan, I advise sizing your reservoir based on your roof catchment area and local rainfall averages. The FLAT 3000l underground cistern is an ideal reservoir to power automatic pop-up sprinkler networks and pressure pumps. Meanwhile, our above-ground Aquatowers serve as elegant, convenient gravity-fed water stations for manual hose or watering can use. The seamless construction from pure HDPE ensures that your system remains leak-free through changing seasonal freeze-thaw cycles for decades.
FAQ – Frequently asked questions
Do above-ground Aquatower tanks need to be drained for winter?
Yes, all above-ground water tanks must be completely drained before freezing winter temperatures arrive. It is recommended to leave the drain tap open through the winter. Even though the HDPE shell is frost-proof, expanding ice inside could damage the brass valves and plastic outlets.
What are the benefits of installing a low-profile FLAT underground tank?
The FLAT underground cistern features an exceptionally low profile. It requires approximately 60% less digging depth than standard vertical cylindrical tanks. This speeds up the installation process immensely and lowers costs for professional earthworks or excavator rental.
Is the harvested water safe for watering vegetables and fruits?
Absolutely. Rainwater is natural, soft, and slightly acidic (pH around 6.0), creating optimal absorption conditions for edible crops and ornamental plants alike. Sorfan tanks are made from virgin, food-grade polyethylene, which is non-toxic and contains no harmful chemical additives.
Can the FLAT underground tank be installed under a driveway?
Yes, installation under light vehicle traffic is possible, provided you use the dedicated shaft extension pipe, a class B125 driveway-safe cover, and backfill the tank with a cement-sand dry mix in accordance with the structural installation guide.
How do I connect an above-ground Aquatower tank to a downpipe?
Connection is done using a rainwater diverter (downpipe filter) installed directly onto your metal or PVC downpipe. The diverter filters out leaves and debris, channels the clean water into the tank, and automatically acts as an overflow when the tank is full.
What material are the rainwater tanks manufactured from?
All our tanks are manufactured in the European Union from premium, high-density polyethylene (HDPE) using rotational molding. The material is 100% recyclable, environmentally inert, highly resistant to soil chemicals, and UV-stabilized.