I left the hot water taps upstairs and downstairs running and afterwards found no water at all coming through the taps , there is just a single large water tank at rooftop level attic

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I left the hot water taps upstairs and downstairs running

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Do you live in the UK? You ran all the water. Other stories tank? Can you tell me why. How do you fill the tank? Is this a story tank or water heater? Can you give me more details? Back to you, Tom