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The need to take homes off gas has increased ever since the conflict in Ukraine. A heat battery with salt and water as simple components could provide a quick and large-scale solution for over three million households in the Netherlands—twice the target set by the Dutch government. This heat battery, being developed by a consortium of Eindhoven University of Technology, TNO, spin-off Cellcius and industrial partners, is cheap, compact, loss-free and now ready for the first real-world tests.