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Tankmasta underground tanks

Growmax distributes a  polyethylene water tanks for storage of drinking water. Includes range of sizes, colours and order detail. 

Underground Tank Warranty

Tankmasta underground water storage tanks are warranted for a period of seven years against faulty workmanship and/or material fault, providing the installation instructions supplied are adhered to by an accredited installer. Growmax cannot take any responsibility whatsoever for the preparation of tank sites or the installation of its products after delivery.  Underground installations are subject to a range of conditions that vary from site to site. Gromax recommends that all installations be independently assessed by a suitably qualified person to establish how best to approach the unique features of the installation site.


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We have taken on board a whole new suite of products:

  • Solar water heating systems
  • Solar wind systems
  • Solar hot water
  • Solar pool heating
  • Soalr air heating and  yes we still sell water tanks.