Fluctuating temperature 9.0 kw mira sport 2010

Temperature get really hot when turn the dial up and really cold when the dial turns down, shower head good and hose is good. What I did put a new head on fine at first but still did hot and cold, it when I took the head off lots of lime scale came out . so was asking if I need to change the heater tank and possible the flow valve as I think it will damage this as well. many thanks Tim
Asked 5 years ago by Tim
The flow valve maybe damaged by the lime scale, so changing this maybe the best first step.

Answered 5 years ago by Barrie Seabright

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