Each electricity bill I receives gives an estimated breakdown of what I am using the electricity on. Each bill, AGL says I use at least 50% of the bill on hot water, yet there are only 2 people in the house.Is it normal to use 50% of power on hot water ? What could be the reasons for such a high level of use on hot water ? I note there is a booster switch in my switchboard- and its turned on . Could this be incurring extra costs that I dont need ?