An old, unrated shower can use 15 to 20 litres of water a minute. The 3-star WELS-rated showerhead eligible for the rebate uses 7.5 to 9 litres of water a minute. This is a reduction of 50 to 60 per cent. For the average household, replacing a showerhead will save around 15,000 litres of water a year.
4-star WELS rated spouts, mixers, aerators and flow controllers can halve the amount of water you use in basins and sinks. A running tap typically uses 12 to 15 litres of water a minute. The 4-star WELS rated spouts, mixers and flow regulating devices use 6 to 7.5 litres of water a minute.