Lectrician
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If you have a vented system with a cylinder in your airing cupboard, you will have a large water tank, usually in the loft above the airing cupboard. This tank supplies water, through gravity, to your hot and usually also your cold taps everywhere except usually the kitchen sink.
If this tank is not being filled due to a faulty ball valve or a restricted flow through a service valve or blockage, you may be emptying the tank quicker than its able to refill.
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