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Posted by Heatpro on May 24, 2010 at 21:26:21:
In Reply to: Buderus GB142 and water softener posted by Jeremy on May 24, 2010 at 19:41:04:
Not knowing about something is hardly a reference point.
Hard water contains calcium and magnesium which counters acidity over time and isn't a problem after the small amount of the one-time fill precipitates out on surfaces of a Buderus. Large amounts of solids can be abrasive. Softened water can have small amounts of salts, depending upon the method of softening, so untreated water might or might not be as good or better, depending on the water quality. You might be interested to get a water analysis before using it.
http://en.wikipedia.org/wiki/Water_softening
If there is concern, it is possible to fill with distilled water from the supermarket.
Unless Buderus specifies a chemical for the water, don't add one.