It is pumped into your home water system by the city water supply, or if you have a well, it's pumped into a pressure tank and then into your home. Either way when you open a faucet (essentially a valve) the water will come out.
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.
It either comes in a city 'water main' under the street, then into your home in a 1" pipe, or it comes from your well, into your home pressure tank.
A water pressure gauge. There is one mounted on every well pressure tank, and most well techs and some plumbers carry portable ones that can be screwed onto a garden faucet to read home pressure
Common causes of decreased water pressure in homes on well water include a clogged filter or screen, a malfunctioning pressure tank, a pump that is not functioning properly, or a leak in the system. It is also possible that the water table has dropped, affecting the well's ability to provide adequate pressure.
Water pressure makes the water run out of the faucet. This pressure is provided by the pumps in a city water system, or in the case of a home on a well, by the home pressure tank. This pressure tank is fed by the well pump and also has air pressure in it. Generally the water fills a large balloon (called a bladder) inside the tank, the pump then stops until the pressure drops (when the tank is nearly empty) In most home systems this is about 15 -20 gallons between each pump cycle.
To make water run out of a faucet, potential energy from the water tower or pump system provides the pressure needed. Additionally, electrical energy may be required to power the pump that delivers the water to the faucet.
If you are talking about water pressure in you home water lines, the answer is an incorrect set up of the pressure tank/pressure switch combination. I am currently working on a way to easily solve this problem. If you are interested in that solution, please go to the link below. http://www.surveymonkey.com/s/VGGLLB9
If you are serviced by a city,you get them to place a waterline into the home. -Otherwise you have a well drilled and buy a well system, pump and pressure tank .
In a well system, water is propelled by air pressure.
with a pressure tank and pressure switch
All you have to do to reduce the boiling point of water is go to a higher altitude and boil it.