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Drinking water is heated and stored in hot-water boilers which are generally connected to the central heating system. These boilers also tend to scale up very greatly if the water is hard, primarily if the temperature is high accordingly. Frequently, such boilers also start to rust after a few years and this is why stainless steel boilers are used to a greater extent today. Merus clears the scale in the boilers if used properly and this scale is then flushed out with the water. Existing rust deposits are partially dissolved and converted. The same situation as with kettles occurs on boilers heated electrically. These electrical heating systems may emit fields which impair the action of Merus so that only slight scale removal occurs. Generally, only the build-up of scale again is greatly reduced in such cases.
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