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This is driving me, and British Gas, crazy!! I have a vented system with two hot water cylinders in the loft. A cold water storage tank sits above each one - they have a connecting pipe to ensure the water is level. Each CWST feeds a HWC, and also feeds the power shower. All other taps in the...

Problem: The water in the Cold Water Tank is getting hot! I have tried lengthening the overflow pipe from the top of the cylinder, as I suspected that it was too short and resulting in hot water expanding into the cold water tank – made no difference. So while looking inside the coldwater...

A few years ago we had an extra hot water cylinder fitted in the loft, chained with the old one. In theory, I am told, it should draw from both at the same time…? Also I have two cold tanks chained together, each one feeding its own hot water cylinder. But one cold tank is considerably hotter...