Atlantis 8400 Litre Underground Water Tank

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AtlantisSKU: WAB.8400

£3,829.00 exc. VAT
Sale price£4,594.80

Tax included



This Atlantis 8400 Litre Underground Water Storage Tank is suitable for both domestic and commercial applications, available in both non-potable or potable versions. This tank is mainly used for rainwater harvesting applications, but can also be used for water attenuation and storage of water from other sources such as wells and springs. This robust water storage tank is manufactured in the UK and is moulded from Polyethylene using a rotational moulding process which produces a stress-free product.  Furthermore, there are many design features that make this tank stand out.  The high strength ribbed design allows for environmentally friendly pea-gravel back-fills which as a result eliminates the need for the high costs and difficulties of encasing a tank in concrete.  The shallow-dig depth also makes it easier to install and maintain, as well as being ideal for areas with a high water table (certain installations may require further advice and an alternative installation method).  The curved design allows more efficiency when using submersible pumps as it enables all the water, even from the bottom of the tank to be pumped out.


  • Capacity: 8400 Litre 
  • Shallow dig design
  • Ribbed & curved design providing strength and efficiency 
  • 600mm access point
  • Height: 1725mm
  • Length: 3970mm
  • Width: 2700mm
  • Weight: 387kg
  • 10 Year Warranty, warranty manual supplied with tank

Optional Extras:

  • Potable Water Upgrade - the potable version of this tank is made from WRAS approved polymer that does not leech any colour or flavour in the water.  It is NOT suitable for drinking direct from the tank; the water must be suitably filtered after storage (not supplied by us)
  • Telescopic Neck - this can be placed on top of the existing turret on the tank to provide an extra 300mm – 800mm of depth if required
  • Pedestrian Lid Cover - this lid is suitable for pedestrian use only, potable and non potable versions
  • Vehicle Lid Cover - this lid is suitable for vehicle use
  • Calmed Inlet Drainage Pack - this is designed to filter incoming water and helps prevent it from becoming stained and odorous
  • 110mm Back-flow-Non Return Valve - this is to stop flood back-flow into the tank

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