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 ftHouse water pressure should be around 50-60 psi.
What pressure per square inch water is. -In a typical home on city water you have a PRV set to 50-70 psi
Sounds like a bad/failed water pressure regulator.
how do i increase water pressure to the house if you have city water?
There is usually a main water valve that comes into the house, locate this valve and turn it down. Installing a pressure reducing valve after water main valve will allow for adjustment of water pressure to proper setting.
Area water authority could have increased water main pressure, no or defective expansion tank in house main water line if house has a backflow preventer installed, or defective /not properly set pressure reducing valve.
If you are on a well it means you have a problem in the pressure tank. On city water means pressure in general is down, or your PRV is failing.
you do not have pressure from the source or the line from the source has broken
House pressure, 75 PSI maximum.
Install a pressure reducing valve
Yes, because the water you are recirculating is already past the pressure regulator.
It will be close to the inside wall where the water supply passes into the house from the line going towards the water meret.