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I'll check the isolation valve. No idea how to check the operation of the ball cock - this thing is a black box. Would you know roughly how much it would cost to replace this?

Hi, I've just bought a house and it has a hot water tank (Elson Opal) and a power shower. For some reason when showering, after a certain amount of time, the hot water just stops and the shower can't run. It's not that there's just cold water, there's almost no water coming out at all. The...