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Thanks Guys, now sorted. The flow rate was too high. Back tracking to when the problem started. I had shut the mains water to our house two weeks back to fix an outside pipe. When I put the mains water back on again I must have opened the valve more than it was before, thus increasing...

Thanks for the quick replies, wasn't expecting that! The dhw expansion vessel is attached to the device I am speaking of yes. The heat exchanger was cleaned last winter with a chemical cleaner, can't remember which, a very dark copper soltuion came out of it after leaving in for about 3...

Hi, can anyone help me with some advice please? Had a problem with my DHW last winter. The water temperature was low, baths just not getting hot enough. Cleaned out the heat exchanger and was still low. It is hot enough for showers, but certainly not hot enough for her in doors to take the...