The Caldera Warmstone™zero carbon boiler and heat battery stand in the garage of Caldera CEO, James Macnaghten, at his home in West Sussex, UK., Friday February 12, 2021. Macnaghten and his team at Caldera have designed and made a zero-carbon heat battery Warmstone™ for household use, to replace traditional fossil fuel heating sytems. Photograph : Luke MacGregor

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