Assumptions
Average cost of water: $1.10 per m3
Savings for single flush toilets: 10.5 litres per flush
Savings for dual flush toilets: 12.2 litres per flush
Number of flushes per person: 5 per day
Incentive for single flush toilets: $60 per toilet
Incentive for dual flush toilets: $75 per toilet
 
Pay back calculation for each new toilet
Number of people residing in your home:
Estimated the percentage use of this toilet: %
Type of new toilet:
(single* or dual** flush)
Toilet purchase price:
(including taxes)
Installation costs:
(including any labour, extra parts, etc.)
Applicable incentive:
Estimated water savings: m3 per year
 
 
Pay back calculation
Total cost of the new toilet:
Annual estimated savings:
Estimated pay back: years
 

*Single flush refers to a new toilet that flushes with 6 litres each time the lever is activated.
**Dual flush refers to a new toilet that has an option to flush with 6 litres or 3 litres each time one of the levers is activated.

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