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Hi after 15 minutes the header tank has probably run dry
when this next happens have a check in the header tank to see if its empty. It may be that the ball valve is not flowing properly due to scale or your water pressure just cant keep up with the demand you are placing on it.
Most showers should have a balanced supply, so it should be fed from the same tank for hot and cold
Yes its fed from the same tank. If its set up correctly the hot will run dry first then the cold