The Rainwater HOG tank was designed by award-winning Australian designer and architectural practitioner Sally Dominguez.  Originally seeking to design a low profile horizontal tank for use under decks and patios at inner-city properties where space was at a premium, Sally was told by tank salespeople that a “flat’ plastic tank would not work — and she set out to prove them wrong. Using the continuous walls of a center hole to brace a wide plastic box was a new concept in rainwater storage which has now been adopted by many other tank designers.  Once Sally had designed a working horizontal tank she was determined to make the HOG as useful as possible — so she re-engineered it with several smaller bracing through-holes to create a narrow, space-saving module which could hold and conduit water in any direction without causing pooling or ponding. HOG was named when rainwater was still considered “grey” water — hence the name H2O Grey or H2OG.


HOG tank fits into spaces where other tanks do not, and its compact size allows it to be easily retrofitted and then connected up once in situ for larger volumes of rainwater storage in tight spaces – along side passages, below houses, and under decks.  Not only was the HOG sized to fit between joists spaced at 600mm (24 inch) centers, but it was also sized for maximum thickness (9 ˝ inches/220mm) while also keeping useful thermal mass characteristics.  Any thicker and the thermal benefit would be impaired, any thinner and the capacity would be inconsequential. The tank will support its full weight on any of its surfaces without bulging, which allows it to be installed either horizontally or vertically for rainwater capture. Not other water tank is designed to be so versatile.


Rainwater can be used for watering your garden as well as for toilet flushing, laundry washing and bathing. Rainwater stored in food grade HOGs can be used as an emergency potable water supply. Rainwater is soft water, which means that it wont cause a build up of calcium in your plumbing like hard water can. You can drink rainwater as long as your roofing material does not contain toxic materials. You will need to add a first flush diverter to the fine screen filter in the Inlet kit. Don’t let your rainwater go to waste - the Rainwater HOG is functional, efficient and visually discreet rainwater storage!

For more information on Rainwater Hogs or to place an order, please contact a happyPLACE representative at info@happy-place.com or call 859-523-7171.