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10-15 pounds per square inch typically. How high above your taps is the surface of the water in your roof tank? Use centimetres. Then the weight of water pressing on your downstairs taps is that height, in units of grams per square cm. Convert it to pounds per square inch if you like. 1psi is 454gm/2.542cm2 =70.4gm/cm2.

Static pressure is .433 x height 20 feet would be 8.66 PSINow if you wanted to PUMP water to a height of 20 feet you would need8.66 PSI X 2.31 = 20.00 ft
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14y ago

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