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Dec 19, 2023

Using electric water heaters to store energy could do the work of 2 million home batteries

Posted by in categories: energy, sustainability, transportation

“Electric water heaters offer a cheap way to store large amounts of energy, in the form of hot water. A heater with a 300-litre tank can store about as much energy as a second-generation Tesla Powerwall – at a fraction of the cost.”


Australia’s energy transition is well under way. Some 3 million households have rooftop solar and sales of medium-sized electric cars are surging. But as we work towards fully electric households powered by renewable energy, have we overlooked a key enabling technology, the humble electric water heater?

About half of Australian households use electric water heaters, while the rest use gas. So what’s so great about electric water heaters?

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