Built-in coffee makers with adjustable water hardness
prices on 15 modelsWater hardness
— the ability to adjust the coffee machine to the hardness of the water used. It is necessary because the machine's heater is prone to scaling, which requires regular cleaning. The amount of scale buildup depends on the water hardness, and the machine estimates it based on the hardness setting and the time since the last cleaning. To ensure timely descaling, the correct hardness setting must be selected. Coffee makers with this function usually come with a water hardness indicator and offer four settings: very soft, soft, hard, and very hard.