means you are running out of hot water
You are running the water heater out of hot water faster than it can heat the incoming cold water.
A brief rainfall, usually of variable intensity.
yes you are even though you are not in the shower you are still wasting water
Because it effects the water pressure of the shower. This causes the temperature of the water in the shower to also change.
A Vichy shower is different from a regular shower due to the distribution of water flow. A Vichy shower has a metal arm with several shower heads running parallel to the ground, allowing the person to shower while lying down.
The shower diverter is loose or broken inside and needs to be changed.
If you dont shower
Remove the shower head and clean out anything that might be blocking it, such as hair or debris. Replace the shower head and turn on the water; the water should be running.
Incorrect pipe size installations
the outlet pipe at the base of the shower has not got enough angel for the water to run free
3 days
lose washer