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Gasman, No-we have to pay for this: When the plumber visited on behalf of the insurance company, he adjusted the diverter valve as much as possible, but advised that it was a scale problem so this is not covered by our insurance and it has to be rectified by us, at our cost, before they will...

Thank you for your reply. It's just that I have read other posts where powerflushing seem to apply more to radiator problems than hot water probs. Is powerflushing basically descaling? (sorry if this may be a stupid question to the experts!), but the insurance company want a piece of paper...

Gasman, I'm just concerned that powerflushing is not the solution to scale in the hot water circuit. In my ignorance I don't know if powerflushing will descale my boiler for the domestic hot water problem? Silly question - is this more for central heating problems?

We had a problem where the hot water would not come on unless the central heating is on. We are insured for boiler breakdown and the plumber duly visited. I was advised that the problem was intermittent diverter failure due to the domestic hot water circuit being very restricted, due to...