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Calculations for Water Saving Devices


BATHROOM SAVINGS
Fit an AAA shower rose or flow control valve rated at 9 litres/minute

People in Household

Typical Litre Savings Per Year
1 10,950
2 21,900
3 32,850
4 43,800
5 54,750

TOILET
Install a 6/3 litre dual flush toilet

People in Household Typical Litre Savings Per Year replacing an 11/5 litre Dual Flush Typical Litre Savings Per Year replacing an 11 litre Single Flush
1 8,000 14,000
2 14,000 26,000
3 19,000 35,000
4 23,000 42,000
5 27,000 50,000

Laundry
Purchase of AAAA rated Washing Machine

Average number of Washes per Week Estimated Savings
2 8,000
4 16,000
7 28,000

OTHER
Rainwater Tanks

Installation of a rainwater tank as follows:

Size of Tank Estimated Saving
600 litre 3,600
1000 litre 6,000
1700 litre 10,000
2250 litre 14,000
3600 litre 22,000

Rain Sensor on a Garden Irrigation System

Size of Property Estimated Savings
400 sq. metres (Typical Unit Devt) 15,000
600 sq. metres (Small house allotment) 20,000
900 sq. metres (Equiv 1/4 acre allotment) 30,000

Information sourced from the water retailers.