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Need help selecting which tank is right for you? Use our calculator below to make your selection easier!

Summary

Litres per day
Litres per year
Rain harvested
Tank size
Roof Area (Sq. Metres)
Average Annual Rainfall (mm)
Click here to find out your local average annual rainfall.
Amount of Rain Harvested (litres)
Assume the tank can fill 3 times per year (Depends on rainfall and usage patterns)
Minimum Tank Size
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Summary
Litres per day
Litres per year
Rain harvested
Tank size

Indoors

Activity Amount (per day) Daily (ltr) Yearly (ltr)
Shower15 litres per minute
Mins
Bath150 litres
People
Dishwasher30 litres per load
Loads
Front Load Washing Machine80 litres per load
Loads
Top Load Washing Machine100 litres per load
Loads
Brushing Teeth (tap running)5 litres per minute
Mins
Drinking, Cleaning & Cooking10 litres per day, per person
People
Hand Basin Use5 litres per use
Times
Toilet Flush single6 litres per flush
Times
Toilet Flush half3 litres per flush
Times

Outdoors

Activity Amount (per day) Daily (ltr) Yearly (ltr)
Garden Sprinkler15 litres per minute
Mins
Car Wash200 litres per wash
Times
Hosing Hard Surfaces15 litres per minute
Mins
Drip System6 litres per hour
Times
Filling PoolSize in litres
Litres
TOTAL LITRES PER ANNUM
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