Water pressure refers to the pressure of water in a system. In a home it will be 30-50 psi typically and this is governed by the municipal pressure or by a well tank.
The pressure tank is likely "water logged". It has lost the air inside the pressure tank.
House water pressure should be around 50-60 psi.
No and yes. No, you won't get more water pressure. To do that you'll need to find out why the water pressure is low. Perhaps flow restriction, perhaps a poorly adjusted water pressure regulator, perhaps low pressure from the well/city water. But an additional water heater will certainly give you more hot water. It would be like putting in a LARGER water heater. In most cities the water pressure required is about 20 PSI. Small city's do not add pressure pumps to their system but use a gravity supply. That is why most places there is a pressure problem either build their water tanks taller or erect them on a hill.
you can improve water pressure by installing a booster pump or if on a well then turn up your set pressure. If you had good pressure before and now are having poor pressure then it could be many reasons.
Call the water board, if you can't turn the pressure down on the boiler.
pressure difference
My guess is that the hot water heater is installed downstream from a pressure reducer to limit the maximum water pressure that the water heater is exposed to.
An indication of the test pressure in terms of water depth does not mean a water,
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.
If you mean a well tank, the water is forced in by the pump. The residual air pressure pushes the water out to the faucets.
What pressure per square inch water is. -In a typical home on city water you have a PRV set to 50-70 psi
when the water pressure is low in the shower
Water, like any fluid, flows from where its pressure is higher to where its lower.
What do you mean by bad? Bad water pressure? Bad water?
If you mean to ask if cold bodies of water are associated with high or low atmospheric pressure, they aren't. Atmospheric pressure can change independently of the temperature of bodies of water.
The cold water inlet valve to the water heater is closed.
when water vapour condenses and forms clouds whichthen produces an air pressure which produces precipitation like a water cycle.