Reducing hot water usage follows the same principals as reducing overall water usage. To this end the federal governments Water Efficiency Labelling scheme (WELs) achieves both savings in water and energy for heating water.
Shower and tap fittings, washing machines and dishwashers are all now regulated by mandatory WELs. Therefore new products all comply with minimum water standards.
Look out for the labels..... The more stars, the better the rating. More importantly, look at the water consumption which provides a flow rate or volume of water per use, depending on the appliance.
The biggest uses of hot water in typical homes is
1) showers and baths - water efficient fittings reduce overall water use and heating costs.
2) washing machines - washing in cold water reduces hot water heating costs
While water and energy efficient washing machines will achieve the lowest hot water consumption, it is not the scope of this site to detail these products.
≤9L/min. The higher the flow rate the more urgent it is to replace the shower head. It is not uncommon to find showers having a flow rate of 40L/min. The savings in hot water costs are in the order of $300 per year, if this head is replaced!
All shower heads sold now have a maximum flow rate of 9L/min. Many quality showers heads with lower flow rates such as 7.5 and 5.5L/min are available. For example the Perfect Flow Ultimate 5.5L/min Shower Head from Todae Google with your desired flow rate results in many reviews and products of lower flow showerheads.
Some new thinking is beginning to emerge for reducing hot water costs. Some of the associated technology includes: