Legionella bacteria are normally found in soil and in water in nature. In such natural environments, the concentration of bacteria is low, and the risk of becoming infected is not present. It is only when the bacteria get good growth conditions in technical installations, and multiply to a large number, that the risk of infection arises. In order to be able to infect, the bacteria must be spread to the environment in finely distributed water droplets (aerosols) which are breathed into the lungs.

Legionella bacteria can cause Legionnaires’ disease and Pontiac fever. Legionnaires’ disease is a serious lung disease.

For the bacteria to flourish and thus become dangerous, prolonged humidity and relatively high temperatures are required. It can survive for over a year in, for example, a drop of water or tap water.

The bacteria do not survive temperatures above 70 degrees.


Information from the authorities:

Step by step

This heat treatment should be repeated at least once every year. It should also be carried out after the showers have been left unused, for example after several weeks of holiday.

It is very rare to have more than 70 degrees in the shower. Therefore, it is important that you follow the instructions below to prevent spread of legionella bacteria:

  1. Bring water to a boil and set aside (chlorine kills legionella, so you can mix a few drops of chlorine in the hot water)
  2. Unscrew the showerhead from the shower hose by turning the coupling counterclockwise (be careful not to lose the gasket ring when unscrewing the showerhead
  3. Place the showerhead in the hot water and leave it for 5 minutes
  4. Refit the showerhead on the shower hose by turning the coupling clockwise (remember to fit the gasket ring between the showerhead and the shower hose to avoid leakage)
  5. Turn on the shower to flush out any chlorine residue in the showerhead.


It is very important that you follow the steps above, and we therefore want feedback from you. When you have completed the heat treatment above, please fill out and send the form below.