Check your water heater to ensure that the valve in the supply line is open. You can test that the water heater is working by using the relief valve at the top, just beware of the potential for scalding hot water to come out if the heater is operating correctly. If you have a full tank, and all the valves are open around the water heater, it may be time to call a plumber.
House pressure, 75 PSI maximum.
if all the pipes in the house are the same size the easy answer is adjust the outflow valve on the hotwater tank until it matches the cold water pressure.
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.
All pipes in a house are connected, so when two outlets are turned on the water has to change from going in one direction to being divided and go two directions. However, the loss in water pressure should only be temporary . . . usually the system will re-adjust
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.
.In simplified terms . The slower water flow will pick up more heat than the faster water flowing through the heater. Tom H. HVAC proffesional, New Orleans
This is probably a pressure imbalance problem or you have air in the lines. see the related video link provided.