Limescale in the Hot Water Boiler User: Südbad, Stadtwerke München (public utility company) A hot water boiler is used to heat up drinking water and also store it. Often they are directly connected to the central heating. These boilers tend to have problems with limescale, especially when the temperature is high. Additionally these boilers start to corrode after some years. That’s the reason why new boilers often are made from stainless steel. If Merus Rings are installed at the water inlet, limescale and rust is solved in the water and can’t settle anymore. It will be flushed out with the water. There is one factor which can reduce the effect of the water treatment. This is the electrical field which is emitted by the heating spiral. If this field is too strong not the whole incrustation

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