Underground Rainwater Tanks

At Tankless, we take pride in taking the concept of underground water storage to the next level, and that applies to our underground rainwater tanks as well. Our underground rainwater tanks are meticulously designed to ensure the highest level of purity and safety. Each tank is fully enclosed and equipped with advanced filtration systems, guaranteeing that only clean and contaminant-free water enters the storage tanks. With engineer-certified designs, our tanks provide the utmost security, remaining impenetrable even to pets.

Underground rainwater tanks like the ones we offer at Tankless offer several benefits, including:

    • Water Conservation: Underground rainwater tanks help in the efficient use and conservation of water. They collect rainwater runoff from rooftops, which would otherwise be lost or wasted. This collected water can be used for various purposes, such as gardening, irrigation, toilet flushing, and laundry.
    • Space-saving and Aesthetically Pleasing: One significant advantage of underground rainwater tanks is that they don’t take up valuable space on the surface of your property. These tanks are buried beneath the ground, which means you can use your outdoor space more effectively. This can be particularly advantageous for smaller properties or areas with limited space.
    • Protection from Evaporation and External Factors: Underground rainwater tanks provide better protection against evaporation compared to above-ground tanks. Being shielded from direct sunlight, the water stored underground is less likely to evaporate quickly, ensuring that the stored water remains available for longer periods. Moreover, our first class underground rainwater tanks are less susceptible to temperature fluctuations, reducing the risk of algae growth and bacterial contamination.

Our underground rainwater tanks offer water conservation, space-saving benefits, and protection against evaporation and external factors, making them an excellent choice for sustainable water management. Do not hesitate to contact us if you want us to tell you everything regarding our premium underground rainwater tanks and other similar solutions we offer at Tankless. Thank you for trusting our superior solutions!

Best Services

Services We’re Providing

Tankless is a fully enclosed & filtered system. Engineer certified – not even your pet could get in. Trafficable for cars & occasional heavy vehicles.

Underground Water

Replicates a natural Aquifer the load bearing design self-anchors in the ground allows for a higher gravity overflow setting unique to Tankless saving $$$. Modular system simply rolls into place. Pervious capped lid collects both storm & surface water. Easily modified to any shape.

Swimming pool

With our help, you can easily convert your swimming pool into a water storage system. Eliminates drainage & soil slipping ramifications. Excess water drains only to the storm water outlet.

Expert Solutions for Any Requirement

Our expert team designs, builds and supplies fittings, liners, filters, pumps & water storage coils which offers a versatile solution for any site.

Unlimited Surface

Lawn, Vegetable garden, Driveway, Synthetic sports surface, Decking, Indigenous garden with a frog pond. Water feature with a pond-less.

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Why Choose Us

Top Benefits of Choosing Tankless Underground Rainwater Storage Systems

Our experienced team are dedicated to providing excellent customer service and ensuring a seamless installation process.

  • Simple build process
  • Guaranteed build turnaround
  • Honest and dependable
  • Excellent staff administration

Innovative design game changer with gravity discharge when full & load bearing system reduces installation cost.


What Client Say

Tankless water tanks are a smart investment for any home. They provide eco-friendly solution, maximizing water catchment while saving space, energy, and money on your utility bills.

Great product and service. Hard to find experts that know the whole end to end process for building tank and linking it effectivel

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Anthony Jones Hawthorn

Tankless installed a 18,000 litre tank under my front lawn over 10 years ago. As an engineer, I checked out every aspect of the in

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Tony Carolan Brighton

Using the “Tankless” 50,000 litre underground catchment this summer has meant our garden, filled with camellias and roses, is

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Doreen Thomas Camberwell

Just had our Tankless underground tank serviced after 11 years of trouble free use, no issues and great customer communication. wo

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Mike Taylor East Malvern

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