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Posted by HeatPro on January 09, 2005 at 14:40:23:
In Reply to: Valliant gas boiler posted by klock on January 09, 2005 at 14:24:30:
The important question is why a leak was allowed to bring in scale. A sealed system doesn't have a way to let hardness in unless there is a leak. It is harder to remove scale than it is to prevent it.