In many circumstances it is not feasable to replace the standard electric storage hot water system with an energy efficient model such as solar or heat pump hot water. However, signficant savings in hot water costs can be achieved by the following.
Alternative efficient hot water systems include solar boosted electric storage, solar natural gas boosted hot water, heat pump hot water and instant natural gas hot water systems.
Where hot water usage is low and natural gas not available, instant electric hot water systems may be more efficient than a standard electric storage system. Rezi is one quality cost effective option. Costing less than <The advantage is that only water used, is heated.