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OK, thanks. So I think I can disregard both flow sensor and diverter valve.

Thanks, but I had the heat exchanger replaced last year, as I thought it might be scaled up. The old heat exchanger was in perfect condition but it was replaced nevertheless. So I think it's unlikely to be the heat exchanger. I had the diverter valve replaced at the same time. But am I right in...

I just ran 10L of cold water through the kitchen tap in 64 secs. I guess that's 9.375L/min. Does that sound normal? (BTW I did the same for the shower upstairs - cold tap but without the shower head attached. That was 10L in 1min48secs = 5.55L/min.)

The plumber measured 2.5 bar on the inlet to the kitchen tap. Is that normal?

The problem is most pronounced with the shower presumably because of gravity. I haven't specifically tested separate separate basins (will try that tomorrow) but it is true that if I open hot tap on any basin and then open cold on the same basin the boiler will stop sufficiently heating the...

Thanks, although I don't quite understand how this works. If cold is passing into the hot water at the mixer tap, wouldn't the water come out at exactly the same temperature? Also the problem occurs with other taps in the house. It's just much more pronounced with the shower mixer, presumably...

Thanks - no-one has mentioned this before. Couple of questions: How can I check if this has failed? Or do I simply get the valve changed and hope that's the problem? Is the non-return valve definitely on the water heating? Some other sites suggest it is only on the central heating.

I have a shower running off bath mixer taps (i.e. not an electric shower) and for the last few weeks it has been driving me insane... hot water has been intermittent and water pressure is terrible. Plumbers can't figure out what is causing the problem. What happens is this: when I turn on the...