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Thanks for such a quick response. Well.. I've got a name for an engineer who lives locally so I shall be giving him a call tomorrow. The boiler was only a year or so old when I moved in just under 2 years ago. We do live in a hard water area. Thanks..

For the last 2 years the gas combi boiler we have has not been consistent delivering hot water. The CH appears to work fine. When hot water is demanded the water comes out hot but after a minute or so will turn cold. It appears the bolier stops heating the water (even though the tap is still...