Check the inlet valve to H/W tank. make sure it's full on. If still no hot water anywhere you need to call a plumber, you have a weird problem.
House pressure, 75 PSI maximum.
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.
One of the valves that you closed while hooking up the hot water to the sink was probably an old gate valve... It broke and did not fully re-open.
There is usually a main water valve that comes into the house, locate this valve and turn it down. Installing a pressure reducing valve after water main valve will allow for adjustment of water pressure to proper setting.
House pressure, 75 PSI maximum.
Pressure is the same whether hot or cold.
You may have a restriction in your hot water heater exit pipes. There may be corrosion. How old is the house and how old is the hot water heater? What type of pipe is there going out of the hot water heater? You need to know this to fix the problem yourself without hiring a plumber.
The issue of low hot water pressure while the cold water pressure remains fine could be caused by a clog or blockage in the hot water pipes, a malfunctioning hot water heater, or a problem with the hot water valve.
The low hot water pressure in your kitchen sink could be due to a clog or blockage in the hot water line, a faulty hot water valve, or a problem with the hot water heater. The cold water pressure remaining fine suggests that the issue is specific to the hot water system. It may be necessary to check and repair the hot water line or heater to restore proper pressure.
A mega-flow system is simply hot water stored under a certain pressure. The idea is to give one the same pressure throughout the house. This is a good choice of a boiler if one has high hot water demand.
Low hot water pressure compared to cold water pressure can be caused by various factors such as a clogged hot water pipe, a faulty hot water heater, or a malfunctioning pressure regulator. It is important to investigate and address the specific issue to restore balanced water pressure throughout your plumbing system.
Hot water does exert pressure, but the main thing is that it creates steam if hot enough, and that is often used to run machines that require pressure.
If your hot water pressure is lower than the cold water pressure, it could indicate a problem with the hot water heater, such as sediment buildup in the tank or a faulty pressure relief valve. It may also be due to a blockage or leak in the hot water pipes. It is recommended to have a plumber inspect and address the issue to ensure proper functioning of your hot water system.
If you have a leak on the hot water somewhere in the house and the water input into the tank is not running, the tank will lose it's water. And if it is an electric tank, the elements will burn out. Gas hot water tank should be no problem. Pressure valve does not have to be open.
House water pressure should be around 50-60 psi.
The low hot water pressure in your shower may be due to a blockage or buildup in the hot water pipe or valve. This can restrict the flow of hot water, causing lower pressure compared to the cold water. It is recommended to check and clean the hot water pipes or consult a plumber for further assistance.