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Hot water pressure
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If i raise the cold water tank that feeds the hot water cylinder or increase the size of the tank or indeed both will the hot water presure and flow rate increase noticably at the tap?
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The size of the Hot water cylinder is totaly non relevant to the water pressure, but raising the water tank as high as is practical will increase the water pressure. A noticeable increase I am not sure, that depends how much more head ( height you can raise it by). For every 1meter you raise it, you will benifit by 0.1 bar of pressure increase. So if you can only raise it by 1 meter then you will not realy notice it. But if you can build a sturdy platform between the roof rafters and raise it by 3 to 5 meters or more from its current location, then yes you will notice a difference. Just remember to increase the expansion pipe aswell to allow for the greater volume of water and the hot water expansion.
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