Check pipe size for hot water or if galvanized pipe used, pipe could be clogged inside with rust and scale.
To test a pressurerized gas line apply soapy water to all connections. You will see bubbles appear if there are leaks. I see plumbers do this at the houses I work on.
Geyser
Increase the pressure to 40 PSI
The pressure drives the preservative through all of the wood. Once in use, over many years, sun and rain (or water) will leach out the preservative from the outside in.
The pressure of water in the organism is equal to the outside water pressure. This is entirely because the organisms dwelling on the seabed evolved in the presence of high pressure water and formed their cells based on high pressure water. You are unaware of the atmospheric pressure for the same reason, the internal pressure beneath your skin is also atmospheric.
If you have leaks in a water bottle rocket, the pressure will quickly escape along with the water and the rocket won't be able to reach as high an altitude as a rocket without leaks.
Soapy Water
There is normally not a pump on a water heater. The water is moved through normal water pressure. If you are having problems with getting hot water through, it may be that the pipes are corroding or pinched, slowing the flow. Or the hot water heater itself is leaking.
Check for extra white color in the exhaust,could be a ruptured head-gasket.
2
Have system pressure tested at local shop unless the problem is obvious. Check coolant lines (upper and lower) to see if they are leaking. Check radiator for leaks. Water pump may be leaking. Also head gasket could be letting coolant in to oil. Pressure testing will check all these components
No, too high of water pressure causes problems.
It is not so much the temperature of the water but the pressure that the hot water produces. If you will look at almost any car radiator cap you will notice a warning that says something to the effect'warning contents under pressure. Do not remove when hot.'
Yes and what is the question?
check for leaks
3.14159 x the opening and then get the pressure / volume from the flushometer
sounds like you have an air lock in your water works that's not letting the water flow from the engine through the heater matrix. check system for leaks top up and blead as required. if you have no visable leaks get the system pressure tested, could be something more serious developing.