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Message: <blockquote data-quote="jeallen01" data-source="post: 1153703" data-attributes="member: 176704">Can't think of much else - but I know we had to have both the primary and secondary heat exchangers replaced after only 3 months because Bosch Worcester had a production problem which left (ISTR - it was 15 yrs ago!) sand inside them, They certainly didn't try to clean them out (or at least not here).The issue with water in the London area is there's lot of limescale due to the "hard" water, and |'m not sure  that flushing solution would remove that unless you put the exchanger in a bath of it for quite a time, with periodic flushes with clean water.</blockquote>