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You may have a failed check valve. This may be at the shower connections or on the pipework before the shower. A check valve is a sprong loaded one way valve. They have a tendency to stick open therefore making the valve bidirectional. To detect isolate individual items from the hot snd cold...

Is there a gauze filter on the shower inlet? This could be blocked with scale or debris. Isolate the shower supply and inspect. Clean if necessary. Usually the bore of flexible hose is less than that of rigid pipe and this can cause a reduced flow rate.

Well I personally have only every seen braided hoses with a black lining. You could try having the braided hoses changed for the sake of few dollars. Or even exchange the hoses for rigid copper. You would be disappointed if the heater was changed and not the hoses only to find the same problem...

You have now had 3 PRV's installed. Has this been happening since the system was installed? Perhaps the expansion tank is undersized?

Me too. Brilliant idea. It works a treat thanks.

I know this post is a little old but I swear by my Rofrost Turbo 2. I have owned one for about 5 years now. I have never had it serviced and it still works as new. I use it least once a week at it still freezes down to minus 35 degrees centigrade. Here's a link

Hi just another plumber/gas fitter. I hope to be a helpful member of the community