The size of the garden and use of facilities plays a part in deciding, and tank size can be restricted by the space in which you can fit a tank – plus the size of the roof space from where the water is being collected.
Usually the bigger, the better.
Remember that each square meter of roof space provides one litre of water for every 1mm of rainfall.
Check out our Sizelator or contact us to have one of our green plumbers visit your home to determine what’s best for you.