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yes it's just the one bang. it's worse if i turn the hot water on, and then off again quickly.

yes all above board, i have all the correct documentation, i'll get him to check it out asap thanks

i had an ideal isar installed just before xmas. just recently i noticed a bang when any hot water tap is turned on, but only if the ch is already on. it's quite loud and i never noticed it before. any ideas please?