Rule of thumb
A good rule of thumb is it should hold a minimum of four weeks supply. For instance if you use 1,000L of tank water each week in the garden, toilet and laundry combined, purchase a 4,000L tank. This will mean that the tank will only be empty through extended dry periods.
Other factors to consider...
How big is your roof?
How much rainfall do you get in your area?
How much space do you have for a tank?
What type and size is your garden?
How many people live with you?
It is a good idea to install a larger tank as you will be less likely to run out of water during prolonged dry periods. If your tank is going to be large, consult a builder or engineer as it may require structural support. You may also need a building permit from your local council.
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