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If you're looking for the single biggest energy cost hiding in your home, don't look at the air conditioner or the TV. Look at your hot water system. Heating water accounts for roughly a quarter of the average Australian household's energy use — second only to heating and cooling the home itself. If your hot water still comes from an old electric storage tank or a gas unit, you're paying far more for every shower, load of washing and sink of dishes than you need to. A hot wat