For normal usage, no, not necessary. Higher pressure puts added strain on fixture water piping.
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.
The density of water increases with depth due to the increase in pressure. As water molecules are packed closer together under high pressure, the density of water increases. Therefore, in deep water where the pressure is higher, the density of water is also higher.
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.
water at sea level has higher vapor pressure
All you have to do to reduce the boiling point of water is go to a higher altitude and boil it.
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.
poor water pressure from your city. Or if you are on a well, the pump might be going bad.
because the water flows much faster this way and the water pressure is high
House water pressure should be around 50-60 psi.
When the water level is higher inside the flask than outside, the gas pressure in the flask would be lower than the atmospheric pressure. This is because the water exerts a partial vacuum on the gas in the flask, reducing its pressure compared to the external atmospheric pressure.
as you go higher above sea level, pressure decreases. Due to the decrease in pressure, the temperature needed for water to boil is less than it is than it would be at sea level. Thus, it would take less heat energy for the bonds to break and become a gas than it would in an environment with more pressure.
Possibly a pressure reducing valve installed after piping for first faucet, which would cause situation describing.