Limescale deposits in the coffee machine lead to a longer brewing time and poorer heat transfer. Often followed by less water dispensing, which together results in a lower quality and different taste of your coffee.
Limescale deposits build up in the machine over time and can eventually clog the fine pipes. Lime also promotes corrosion of the materials in the coffee machine. Both can damage the machine.
Limescale deposits lead to higher energy consumption in your coffee machine and are therefore harmful to the environment.