Δαφνη Ευτυχια Αρθουρος

Is all of your water supply anemic, or just the shower? If it's a universal problem, go down into the basement with someone who groks plumbing and look for the pressure regulator. Most of the time water comes into the house at a higher pressure and is then restricted before hitting the smaller pipes in your house; perhaps this restriction can be eased up a bit in your house. (But you don't want to just turn it off if you have small, old, or fragile pipes -- hence the person with plumbing clues.)

In the U.S., modern showerheads are federally regulated to be wimpy "to conserve water". If you're reasonably handy with pipe wrench and pliers, you can often remove the flow limiter in the showerhead — usually it's right at the washer.