Pressure is the same whether hot or cold.
the hot and cold water become together then they make an equal tempature. warm :)
Hot or cold?
water pressure
Install on cold water line.
you get warm water.
My guess is that the hot water heater is installed downstream from a pressure reducer to limit the maximum water pressure that the water heater is exposed to.
More than likely it is restiction in your water heater.
Cold water is denser then hot water and weighs more so hot water will always stay on top of cold water no matter the pressure in the line or volume unless forced by flow hot water water will always be on top.
Most geysers erupt hot water, however there are a few cold water geysers in the world. The reason why they 'erupt' is due to pressure, it has nothing to do with water temperature.
You probably haven't re-opened the cold water inlet valve.
These are the five feelings 1. Hot 2. Cold 3. Pressure 4. Touch 5. Pain
Not being able to see the pipe and not knowing where it is, it's kind of hard to know. If it is a cold water line and you have not shut off the hot water tank, the pressure from the hot water will back flow and hot water will come out of the cold side.