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We had a similar experience with British Gas - over an 18 month period they fitted an electro-magnetic limescale inhibitor (still not sure it makes any difference), flushed our system and replaced the heat exchanger (the engineer noted that the old one wasn't in bad nick but seemed confident it...

Banhamd - after taking this one up with the mixer manufacturer back in February they suggested that I remove the thermostat cylinder and soak it in vinegar overnight as they thought the problem was most likely caused by a build-up of limescale. And you know what? They were right! I've only...

Thanks both. Just to clarify - I can see how a check valve on the hot feed will stop cold water getting into the hot water system for the rest of the house, but am I right in thinking that it won't mend the valve problem and that the shower temperature will still be luke warm?

Nige - yes it's a Vaillant combi boiler. What's a check valve? Is it a sort of one-way restrictor?

It's a Crosswater KU2001C. The model seems to be long gone and there's little if anything I can find about it on Google. Looking at a technical diagram of the valve I can't quite understand how it's possible for the mains supply to feed the hot water system.

Hi - just posting to see if anyone's had a similar problem to this: I've been having intermittent problems with my hot water temperature going from hot to luke warm - not just in the shower but in sinks around the house. Over a two year period and many call outs I've had a new heat exchanger...