Water flows down from a height. If the water tank was not higher than your house, the water from the tank would not flow to your house without the use of a pump.
Because water flows downwards, and by help of which we can get a evenly distributed water supply in the house.
absolutely think about two story house with tank on first floor
When water is pumped from a well, lake, or river it is sometimes sent to a treatment plant and then a water storage tank. This tank is higher than your house and water flows to the lowest open point (your tap). There is .43 psi per foot of water so the higher the tank is above your house the more pressure you will have.
because the water flows much faster this way and the water pressure is high
There are many variables in trouble-shooting problems with a septic system. If there is sewage in the house, lift the lid and check the water level. If the water level is lower than the outlet call a plumber. If the water level is higher than the outlet, the problem is the tank.
I'd guess to save energy by using gravity to funnel water instead of suction or other means.
A boiler functions by boiling water to a steam, which rises upwards. Keeping the hot water tank above the boiler helps keep the hot water hot, as well as allowing the steam to carry itself to the tank, instead of the hot water tank producing steam feeding back into the boiler.
Gravity can 'bring' water down into the house.
Think of it as water flowing down a hill, but instead of on the ground it is in a pipe. For a typical "Petticoat Junction" type rain-water reservoir that will supply the home with running water, it is the difference in height between the faucet and tank that provides the water pressure to push the water through the pipes. The higher the tank, the greater the pressure at the faucet-- which means higher flow. If the tank was not higher than the house, nothing would come out of the faucet. A city water supply supposed to be around 60psi but can vary greatly depending on the terrain. Since most water is gravity fed from elevated tanks, a home at the bottom of a hill will have higher water pressure than one at the top of a hill. Cities with big ranges in elevation have pumps to boost pressure at higher areas and regulators to reduce pressure in lower ones. The elevated tanks are closed at the top and do not collect rain water. Water is pumped up to the tank overnight while people are using the least amount. During the day, the full tank supplies all the water the city needs. High-rise buildings are fed with the same water supply as the rest of the city, but have booster pumps every so many floors to maintain a reasonably constant pressure over the full height of the building.
What kind of tank? How much water is in it? Is there air in the tank? What fills the tank? What kind of pressure from where and what?answerIf the tank is gravity fed, multiply .431 times the altitude that the source is above the tank. For example, the reservoir supplying my domestic water system is approximately 200 feet higher than the valley floor I live on. My water pressure is slightly over 80 psi. If the tank is pump fed, and if you have no information on the pump, you will have to put a gauge on the system.
For normal usage, no, not necessary. Higher pressure puts added strain on fixture water piping.